mb_strripos

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

mb_strriposFinds 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.

See Also

  • strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
  • strrpos() - Find the position of the last occurrence of a substring in a string
  • mb_strrpos() - Find position of last occurrence of a string in a string

add a note

User Contributed Notes 2 notes

up
0
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
$res;
}
?>
up
-1
ivrokrambler at gmail dot com
7 years ago
<?php
function backStrpos($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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