php man page for strrpos

STRRPOS(3)								 1								STRRPOS(3)

strrpos - Find the position of the last occurrence of a substring in a string

SYNOPSIS
       int strrpos (string  $haystack, string  $needle, [int  $offset])

DESCRIPTION
	Find the numeric position of the last occurrence of $needle in the $haystack string.

PARAMETERS
	      o $haystack
		- The string to search in.

	      o $needle
		- If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

	      o $offset
		-  If  specified,  search will start this number of characters counted from the beginning of the string. If the value is negative,
		search will instead start from that many characters from the end of the string, searching backwards.

RETURN VALUES
	Returns the position where the needle exists relative to the beginnning of the $haystack string (independent of search direction  or  off-
       set). Also note that string positions start at 0, and not 1.

	Returns FALSE if the needle was not found.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

CHANGELOG
       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.0.0	|						    |
       |	|						    |
       |	|  The $needle may now be a string of more than one |
       |	| character.					    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES
       Example #1

	      Checking if a needle is in the haystack

	       It  is  easy  to  mistake the return values for "character found at position 0" and "character not found". Here's how to detect the
	      difference:

	      <?php

	      $pos = strrpos($mystring, "b");
	      if ($pos === false) { // note: three equal signs
		  // not found...
	      }

	      ?>

       Example #2

	      Searching with offsets

	      <?php
	      $foo = "0123456789a123456789b123456789c";

	      var_dump(strrpos($foo, '7', -5));  // Starts looking backwards five positions
						 // from the end. Result: int(17)

	      var_dump(strrpos($foo, '7', 20));  // Starts searching 20 positions into the
						 // string. Result: int(27)

	      var_dump(strrpos($foo, '7', 28));  // Result: bool(false)
	      ?>

SEE ALSO
       strpos(3), stripos(3), strripos(3), strrchr(3), substr(3).

PHP Documentation Group 														STRRPOS(3)