mb_strripos

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

mb_strripos — Finds position of last occurrence of a string within another, case insensitive

Description

mb_strripos(
    string $haystack,
    string $needle,
    int $offset = 0,
    ?string $encoding = null
): int|false

mb_strripos() performs multi-byte safe strripos() operation based on number of characters. needle position is counted from the beginning of haystack. First character's position is 0. Second character position is 1. Unlike mb_strrpos(), mb_strripos() is case-insensitive.

Parameters

haystack: The string from which to get the position of the last occurrence of needle
needle: The string to find in haystack
offset: The position in haystack to start searching
encoding: Character encoding name to use. If it is omitted, internal character encoding is used.

Return Values

Return the numeric position of the last occurrence of needle in the haystack string, or false if needle is not found.

Changelog

Version	Description
8.0.0	`needle` now accepts an empty string.
8.0.0	`encoding` is nullable now.

User Contributed Notes 2 notes

down

easai ¶

14 years ago


Here are Java like startsWith/endsWith implementations in PHP.



<?php

    function startsWith($haystack,$needle)

    {

      $res=FALSE;

      if(mb_strripos($haystack,$needle,0,"utf-8")==0)

         $res= TRUE;

      return $res;

    }



    function endsWith($haystack,$needle)

    {

      $res=FALSE;

      $len=mb_strlen($haystack);

      $pos=$len-mb_strlen($needle);

      if(mb_strripos($haystack,$needle,0,"utf-8")==$pos)

         $res= TRUE;

      return $res;

    }

?>

down

-1

ivrokrambler at gmail dot com ¶

7 years ago


<?php
function backStrpos($str, $needle, $offset){
    $needler = backStr($needle);
    $strr = backStr($str);
    $offsetr = strlen($str) - 1 - $offset;
    $posr = mb_stripos($strr, $needler, $offsetr);
    return strlen($str) - 1 - $posr - strlen($needle);
}
function backStr($str){
    $str = str_replace(array('<', '>'), array('>', '<'), $str);
    return strrev($str);
}

function backStrpos($str, $needle, $offset){
    $needler = backStr($needle);
    $strr = backStr($str);
    $offsetr = strlen($str) - 1 - $offset;
    $posr = mb_stripos($strr, $needler, $offsetr);
    return strlen($str) - 1 - $posr - strlen($needle);
}
function backStr($str){
    $str = str_replace(array('<', '>'), array('>', '<'), $str);
    return strrev($str);
}

$test = '<table><TR>TEXT</TR><TR>TEST</TR></table>';
$pos = mb_stripos($test, 'TEST', 0);
var_dump($pos);
var_dump(backStrpos($test, '<tr', $pos));
var_dump(backStrpos($test, '<tr', backStrpos($test, '<tr', $pos)));

------->
int(24)
int(19)
int(6)

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