return($y^($x|(~$z)));
}

functionmd5_FF(&$a,$b,$c,$d,$x,$s,$ac)
{
$a=AddUnsigned($a,AddUnsigned(AddUnsigned(md5_F($b,$c,$d),$x),$ac));
$a=RotateLeft($a,$s);
$a=AddUnsigned($a,$b);
}

functionmd5_GG(&$a,$b,$c,$d,$x,$s,$ac)
{
$a=AddUnsigned($a,AddUnsigned(AddUnsigned(md5_G($b,$c,$d),$x),$ac));
$a=RotateLeft($a,$s);
$a=AddUnsigned($a,$b);
}

functionmd5_HH(&$a,$b,$c,$d,$x,$s,$ac)
{
$a=AddUnsigned($a,AddUnsigned(AddUnsigned(md5_H($b,$c,$d),$x),$ac));
$a=RotateLeft($a,$s);
$a=AddUnsigned($a,$b);
}

functionmd5_II(&$a,$b,$c,$d,$x,$s,$ac)
{
$a=AddUnsigned($a,AddUnsigned(AddUnsigned(md5_I($b,$c,$d),$x),$ac));
$a=RotateLeft($a,$s);
$a=AddUnsigned($a,$b);
}

functionConvertToWordArray($sMessage)
{
$lWordArray=array();
$MODULUS_BITS=512;
$CONGRUENT_BITS=448;
$lMessageLength=strlen($sMessage);
$lNumberOfWords=(floor(($lMessageLength 

floor(($MODULUS_BITS-

$CONGRUENT_BITS)/BITS_TO_A_BYTE))/floor($MODULUS_BITS/BITS_TO_A_BYTE)) 
1)*floor($MODULUS_BITS/BITS_TO_A_WORD);
$lBytePosition=0;
$lByteCount=0;
while(!($lByteCount>=$lMessageLength))
{