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Find position of last occurrence of a char in a string


strrpos

(PHP 4, PHP 5)

strrposFind position of last occurrence of a char in a string

Description

int strrpos ( string $haystack , string $needle [, int $offset = 0 ] )

Returns the numeric position of the last occurrence of needle in the haystack string. Note that the needle in this case can only be a single character in PHP 4. If a string is passed as the needle, then only the first character of that string will be used.

Parameters

haystack

The string to search in.

needle

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

offset

May be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string.

Return Values

Returns the position where the needle exists. Returns FALSE if the needle was not found.

Changelog

Version Description
5.0.0 The needle may now be a string of more than one character.
5.0.0 The offset parameter was introduced.

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() - Find position of first occurrence of a string
  • strripos() - Find position of last occurrence of a case-insensitive string in a string
  • strrchr() - Find the last occurrence of a character in a string
  • substr() - Return part of a string
  • stristr() - Case-insensitive strstr
  • strstr() - Find first occurrence of a string

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