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@ 2013-07-30T17:15:45Z

<?php

$str = "racecar";
$pal = "";

for($a=0; $a<strlen($str); $a++)
{
	echo $a;
    for($z=0; $z<strlen($str); $z++)
        $subs = substr($str, $a, $z);
    if( $subs == strrev($subs) && strlen($subs) > strlen($pal) ) {
        $pal = $subs;
    } 

}

echo $pal;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
strrev: documentation ( source)

preferences:dark modelive preview

38.55 ms | 402 KiB | 5 Q