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Look for the position of the first occurence of string2

Look for the position of the first occurence of string2

<? 
/* 
Look for the *position* of the first occurence of string2 
in string1, beginning at position start. 
*/ 

function InStr($Start, $String1, $String2) 
{ 
    $i = $Start; 
    while ($i < strlen($String1) - strlen($String2)) 
    { 
        if (substr($String1, $i, strlen($String2)) == $String2) 
        { 
            return $i; 
            exit(); 
        } 
        $i++; 
    } 
        return 0; 
} 
?>