Find last occurrence of a string in a string [RESOLVED]

I do not have PHP 5, so I cannot use strrpos().

Does anyone have a code snippet to find the last occurrence of a string in a string for pre-PHP5?

You could use the strrpos() function. ;)

strrpos -- Find position of last occurrence of a char in a string

And,

The needle may be a string of more than one character as of PHP 5.0.0.

So I can't use that.

What I ended up doing though, was:

PHP Code:

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$largestring = //whatever
$reverselarge = strrev($largestring);

$posoflastchevron = strlen($largestring) - strpos($reverselarge, ";781#;pma&"); 


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Although I don't quite like this method.

Hmm... just saw this:

PHP Code:

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   function strepos($haystack, $needle, $offset=0) {       
       $pos_rule = ($offset<0)?strlen($haystack)+($offset-1):$offset;
       $last_pos = false; $first_run = true;
       do {
           $pos=strpos($haystack, $needle, (intval($last_pos)+(($first_run)?0:strlen($needle))));
           if ($pos!==false && (($offset<0 && $pos <= $pos_rule)||$offset >= 0)) {
               $last_pos = $pos;
           } else { break; }
           $first_run = false;
       } while ($pos !== false);
       if ($offset>0 && $last_pos<$pos_rule) { $last_pos = false; }
       return $last_pos;
   } 


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Sorry :blush: - I didn't read your question.

Although your solution need only be a few lines. This works fine :ehh:

PHP Code:

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    function strrpos_new($haystack, $needle, $offset = 0)
    {
        /* set initial return value to false, just incase the string
           is never found */
        $old_pos = false;
        
        /* use strpos() until no match is found */
        while (($pos = strpos($haystack, $needle, $offset)) !== false) {
            $old_pos = $pos;
            $offset = $old_pos + strlen($needle);
        }

        /* return the old position */
        return $old_pos;
    } 


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And this version can handle negative offsets ;)

PHP Code:

---

    function strrpos_new($haystack, $needle, $offset = 0)
    {
        /* check for a negative offset and assertain where
           searching should stop */
        if ($offset < 0) {
            $stop = strlen($haystack) + $offset - 1;
            $offset = 0;
        } else {
            $stop = strlen($haystack) -1;
        }

        /* set initial return value to false, just incase the string
           is never found */
        $old_pos = false;
        
        /* use strpos() until no match is found */
        while (($pos = strpos($haystack, $needle, $offset)) !== false
                && $pos <= $stop) {
            $old_pos = $pos;
            $offset = $old_pos + strlen($needle);
        }

        /* return the old position */
        return $old_pos;
    } 


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Be a doll and add [Resolved] to the thread title, will ya? ;)

I shall require a fee for completion of such a service.