Wanna use SHA-2 algorithm? Try this:

Download Tar-Ball from http://www.adg.us/computers/sha.html
Compile (may occur some warnings) and test it:

cc -O2 -DSHA2_UNROLL_TRANSFORM -Wall -o sha2 sha2prog.c sha2.c
./sha2test.pl

Copy it to /usr/local/bin/ (don't forget to check permissions)

Here are two functions that could be used with:

function sha2($bits, $string){
    $sha2bin="/usr/local/bin/sha2";
    $echocmd="echo";
    if(!in_array($bits, array(256, 384, 512)))return(false);
    $r=exec($echocmd." ".escapeshellarg($string)."|".$sha2bin." -q -".$bits, $sha2);
    return($sha2[0]);
}

function sha2_file($bits, $filename){
    $sha2bin="/usr/local/bin/sha2";
    if(!in_array($bits, array(256, 384, 512)))return(false);
    if(!file_exists($filename)||!is_readable($filename))return(false);
    $r=exec($sha2bin." -q -".$bits." ".escapeshellarg($filename), $sha2);
    return($sha2[0]);
}

and use it like below:

<?php
$str = 'apple';
if (sha2(256, $str) === '303980bcb9e9e6cdec515230791af8b0ab1aaa244b58a8d99152673aa22197d0') {
   echo "Would you like a green or red apple?";
   exit;
}
?>