In PHP, mb_ereg_replace() is used to replace a regular expression with a multibyte support. It scans the string for matches to pattern, then it replaces the matched text with the replacement.
Syntax
string mb_ereg_replace(str $pattern, $str $replacement, str $string, str $options)
Parameters
The function accepts the following four parameters −
$pattern − This parameter is used for the regular expression pattern. It may use multibyte characters in a pattern.
$replacement − This replacement parameter is used to replace the given text.
$string − This parameter is used to check the string.
$options − This parameter is used to check the search option.
Return Values
mb_ereg_replace() returns success for the resultant string or it returns False on error. It returns NULL if the string is not valid for the current encoding.
Example
In this example, UTF-8 encodings are used. The mb_ereg_replace() function will replace the small "h" with a capital "H" and it will return "Hello World" instead of "hello World".
<?php
$result=mb_regex_encoding("UTF-8");
$string = mb_ereg_replace( "[h]","H","hello World");
var_dump($result);
// It returns h as a H
echo "$string";
?>Output
bool(true) Hello World