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getCaptcha.php

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<?php

function generator($totalLength)

{

$characterSet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

srand ((double) microtime() * 10000000);

$index = 1;

$code = '';

while($index <= $totalLength)

{

$number = rand() % 10;

$temp = substr($characterSet, $number, 1);

$code = $code.$temp;

$index++;

}

return $code;

}

$returnCode = generator(5);

$height = 25;

$width = 55;

$captchaImage = imagecreate($width, $height);

$background = imagecolorallocate($captchaImage, 0, 0, 0);

$textColor = imagecolorallocate($captchaImage, 255, 255, 255);

$fontSize = 14;

imagestring($captchaImage, $fontSize, 5, 5, $returnCode, $textColor);

imagejpeg($captchaImage, NULL, 100);

echo json_encode($returnCode);

?>