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(From PHP 5.2.0).")])]),t._v(" "),s("p",[t._v("An basic way to check for the errors, is as follows:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token php language-php"}},[s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("<?php")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$fileError")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$_FILES")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"FILE_NAME"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"error"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// where FILE_NAME is the name attribute of the file input in your form")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("switch")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$fileError")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("{")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("UPLOAD_ERR_INI_SIZE")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Exceeds max size in php.ini")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("UPLOAD_ERR_PARTIAL")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Exceeds max size in html form")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("UPLOAD_ERR_NO_FILE")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// No file was uploaded")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("UPLOAD_ERR_NO_TMP_DIR")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// No /tmp dir to write to")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("case")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("UPLOAD_ERR_CANT_WRITE")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// Error writing to disk")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("default")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(":")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("// No error was faced! Phew!")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("break")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("}")]),t._v("\n\n")])])])]),s("h2",{attrs:{id:"uploading-files-with-http-put"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#uploading-files-with-http-put"}},[t._v("#")]),t._v(" Uploading files with HTTP PUT")]),t._v(" "),s("p",[s("a",{attrs:{href:"http://php.net/manual/en/features.file-upload.put-method.php",target:"_blank",rel:"noopener noreferrer"}},[t._v("PHP provides support"),s("OutboundLink")],1),t._v(" for the HTTP PUT method used by some clients to store files on a server. PUT requests are much simpler than a file upload using POST requests and they look something like this:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("PUT")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),t._v("path"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),t._v("filename"),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v(".")]),t._v("html "),s("span",{pre:!0,attrs:{class:"token constant"}},[t._v("HTTP")]),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("/")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1.1")]),t._v("\n\n")])])]),s("p",[t._v("Into your PHP code you would then do something like this:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token php language-php"}},[s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("<?php")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* PUT data comes in on the stdin stream */")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$putdata")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fopen")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"php://input"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"r"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Open a file for writing */")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$fp")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fopen")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"putfile.ext"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token string double-quoted-string"}},[t._v('"w"')]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Read the data 1 KB at a time\n   and write to the file */")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("while")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$data")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fread")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$putdata")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("1024")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n  "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fwrite")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$fp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(",")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$data")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token comment"}},[t._v("/* Close the streams */")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fclose")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$fp")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("fclose")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$putdata")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("?>")])]),t._v("\n\n")])])]),s("p",[t._v("Also "),s("a",{attrs:{href:"http://stackoverflow.com/questions/12005790/how-to-receive-a-file-via-http-put-with-php",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(" you can read interesting SO question/answers about receiving file via HTTP PUT.")]),t._v(" "),s("h2",{attrs:{id:"passing-arrays-by-post"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#passing-arrays-by-post"}},[t._v("#")]),t._v(" Passing arrays by POST")]),t._v(" "),s("p",[t._v("Usually, an HTML form element submitted to PHP results in a single value. For example:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("pre")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token php language-php"}},[s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("<?php")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("print_r")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$_POST")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("?>")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("pre")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("form")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("method")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("post"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("input")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("hidden"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("foo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("value")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("bar"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("button")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("submit"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("Submit"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("button")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("form")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n\n")])])]),s("p",[t._v("This results in the following output:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("Array")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("foo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" bar\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n")])])]),s("p",[t._v("However, there may be cases where you want to pass an array of values. This can be done by adding a PHP-like suffix to the name of the HTML elements:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("pre")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token php language-php"}},[s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("<?php")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("print_r")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),s("span",{pre:!0,attrs:{class:"token variable"}},[t._v("$_POST")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(";")]),s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("?>")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("pre")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("form")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("method")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("post"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("input")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("hidden"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("foo[]"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("value")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("bar"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("input")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("hidden"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("foo[]"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("value")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("baz"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("button")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("submit"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("Submit"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("button")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("</")]),t._v("form")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n\n")])])]),s("p",[t._v("This results in the following output:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" baz\n        "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n")])])]),s("p",[t._v("You can also specify the array indices, as either numbers or strings:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("pre")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token php language-php"}},[s("span",{pre:!0,attrs:{class:"token delimiter important"}},[t._v("<?php")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token function"}},[t._v("print_r")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v('"')]),t._v("post"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(">")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("input")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("hidden"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("name")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("foo[42]"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("value")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')]),t._v("bar"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v('"')])]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("/>")])]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token tag"}},[s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("<")]),t._v("input")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token attr-name"}},[t._v("type")]),s("span",{pre:!0,attrs:{class:"token attr-value"}},[s("span",{pre:!0,attrs:{class:"token punctuation attr-equals"}},[t._v("=")]),s("span",{pre:!0,attrs:{class:"token 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punctuation"}},[t._v(">")])]),t._v("\n\n")])])]),s("p",[t._v("Which returns this output:")]),t._v(" "),s("div",{staticClass:"language-php extra-class"},[s("pre",{pre:!0,attrs:{class:"language-php"}},[s("code",[s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("Array")]),t._v("\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n    "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("foo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token keyword"}},[t._v("Array")]),t._v("\n        "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("(")]),t._v("\n            "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),s("span",{pre:!0,attrs:{class:"token number"}},[t._v("42")]),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" bar\n            "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("[")]),t._v("foo"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v("]")]),t._v(" "),s("span",{pre:!0,attrs:{class:"token operator"}},[t._v("=>")]),t._v(" baz\n        "),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n"),s("span",{pre:!0,attrs:{class:"token punctuation"}},[t._v(")")]),t._v("\n\n")])])]),s("p",[t._v("This technique can be used to avoid post-processing loops over the "),s("code",[t._v("$_POST")]),t._v(" array, making your code leaner and more concise.")]),t._v(" "),s("h4",{attrs:{id:"remarks"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#remarks"}},[t._v("#")]),t._v(" Remarks")]),t._v(" "),s("h3",{attrs:{id:"choosing-between-get-and-post"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#choosing-between-get-and-post"}},[t._v("#")]),t._v(" Choosing between GET and POST")]),t._v(" "),s("p",[s("strong",[t._v("GET")]),t._v(" requests, are best for providing data that's needed to render the page and may be used multiple times (search queries, data filters...). They are a part of the URL, meaning that they can be bookmarked and are often reused.")]),t._v(" "),s("p",[s("strong",[t._v("POST")]),t._v(" requests on the other hand, are meant for submitting data to the server just once (contact forms, login forms...). Unlike GET, which only accepts ASCII, POST requests also allow binary data, including "),s("a",{attrs:{href:"http://stackoverflow.com/documentation/php/2295/file-uploads",target:"_blank",rel:"noopener noreferrer"}},[t._v("file uploads"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("p",[t._v("You can find a more detailed explanation of their differences "),s("a",{attrs:{href:"http://www.w3schools.com/tags/ref_httpmethods.asp",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(".")]),t._v(" "),s("h3",{attrs:{id:"request-data-vulnerabilities"}},[s("a",{staticClass:"header-anchor",attrs:{href:"#request-data-vulnerabilities"}},[t._v("#")]),t._v(" Request Data Vulnerabilities")]),t._v(" "),s("p",[t._v("Also look at: "),s("a",{attrs:{href:"http://stackoverflow.com/questions/1301863/what-are-the-vulnerabilities-in-direct-use-of-get-and-post",target:"_blank",rel:"noopener noreferrer"}},[t._v("what are the vulnerabilities in direct use of GET and POST?"),s("OutboundLink")],1)]),t._v(" "),s("p",[t._v("Retrieving data from the $_GET and $_POST superglobals without any validation is considered bad practice, and opens up methods for users to potentially access or compromise data through "),s("a",{attrs:{href:"https://www.owasp.org/index.php/Code_Injection",target:"_blank",rel:"noopener noreferrer"}},[t._v("code"),s("OutboundLink")],1),t._v(" and or "),s("a",{attrs:{href:"http://stackoverflow.com/documentation/php/2781/security/9372/sql-injection-prevention#t=201607231513063494449",target:"_blank",rel:"noopener noreferrer"}},[t._v("SQL injections"),s("OutboundLink")],1),t._v(". Invalid data should be checked for and rejected as to prevent such attacks.")]),t._v(" "),s("p",[t._v("Request data should be escaped depending on how it is being used in code, as noted "),s("a",{attrs:{href:"http://stackoverflow.com/a/130323/2104168",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(" and "),s("a",{attrs:{href:"http://stackoverflow.com/a/4224002/2104168",target:"_blank",rel:"noopener noreferrer"}},[t._v("here"),s("OutboundLink")],1),t._v(". A few different escape functions for common data use cases can be found in "),s("a",{attrs:{href:"http://stackoverflow.com/a/1206461/2104168",target:"_blank",rel:"noopener noreferrer"}},[t._v("this answer"),s("OutboundLink")],1),t._v(".")])])}),[],!1,null,null,null);a.default=e.exports}}]);