PHP mb_stristr() Function

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The mb_stristr() is an inbuilt function in PHP that is used to get the first occurrence of a string within another string. It will check case insensitivity.

Syntax:

mb_stristr(
    $haystack, 
    $needle, 
    $before_needle, 
    $encoding = null
): string|false

Parameters:

This function accepts 4 parameters that are described below:

$haystack: This is the string parameter where we search for our first occurrence of the string.
$needle: This is the substring that we want to search in the $haystack parameter.
$before_needle: This is the optional parameter that determines whether to return haystack after or before $needle occurs. If this parameter is “true” it will return beginning to the first occurrence of the $needle string (excluding needle). If this parameter is set to “false”, It will return from the beginning of the $needle to the $needle end.
$encoding: This is the optional parameter that specifies the character encoding in the $haystack and $needle parameters. If the encoding is not provided, it will use character encoding used.

Return Value:

This function returns the portion of $haystack if the needle is found in a $haystack, otherwise, it will return “false”.

Program 1: The following program demonstrates the mb_stristr() Function.

PHP

<?php 
$string = "Hello World"; 
$sub = "WORLD"; 
$result = mb_stristr($string, $sub); 
echo $result; 
?>

Output

World

Program 2: The following program demonstrates the mb_stristr() Function.

PHP

<?php 
$string = "I love PHP"; 
$sub = "PYTHON"; 
$result = mb_stristr($string, $sub); 
var_dump($result); 
?>

Output

bool(false)

Program 3: The following program demonstrates the mb_stristr() Function.

PHP

<?php 
$string = "Hello World"; 
$sub = "WORLD"; 
$result = mb_stristr($string, $sub); 
  
if ($result !== false) { 
    echo "Substring '$sub' found in '$string'"; 
} else { 
    echo "Substring '$sub' not found in '$string'"; 
} 
?>

Output

Substring 'WORLD' found in 'Hello World'

Reference: https://www.php.net/manual/en/function.mb-stristr.php

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