Description:
------------
Passing 2nd argument as an array to strtr() - replace substrings
Here array keys are integers.

Say an interger (7111222333000001) is the find item, consider it as string its length is 16.
Say the subject is Hello which length is 5.

In this case, strtr leaks memory.

However, when the subject is longer than the find item, there is no memory leak.
Also when the find is string there too no memory leak.

Test script:
---------------
$find_replace = array();
$_a = 7111222333000001;//find - consider as string it's length is 16
$_b = 5000001;

for($j=0;$j<10;$j++){	
	$find_replace[$_a + $j] = $_b + $j;
}

function test_strtr($subject, $find_replace){
	$memory_before = memory_get_usage();
	for($i=0;$i<50000;$i++){
		strtr($subject, $find_replace);
	}
	echo round( (memory_get_usage() - $memory_before) /(1024*1024), 4 ).' MB ';
}

test_strtr('Hello', $find_replace);//subject is shorter then find(length 5), memory leaks
test_strtr('Lorem ipsum dolor', $find_replace);//subject is lengthier then find(length 17), no memory leak