PHP Manual
Multibyte String Functions
Replace regular expression with multibyte support ignoring case

mb_eregi_replace

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

mb_eregi_replace — Replace regular expression with multibyte support ignoring case

Description

mb_eregi_replace(
    string $pattern,
    string $replacement,
    string $string,
    ?string $options = null
): string|false|null

Scans string for matches to pattern, then replaces the matched text with replacement.

Parameters

pattern: The regular expression pattern. Multibyte characters may be used. The case will be ignored.
replacement: The replacement text.
string: The searched string.
options: The search option. See mb_regex_set_options() for explanation.

Return Values

The resultant string or false on error. If string is not valid for the current encoding, null is returned.

Changelog

Version	Description
8.0.0	`options` is nullable now.
7.1.0	The function checks whether `string` is valid for the current encoding.
7.1.0	The `e` modifier has been deprecated.

Notes

Note:
The internal encoding or the character encoding specified by mb_regex_encoding() will be used as the character encoding for this function.

Warning

Never use the e modifier when working on untrusted input. No automatic escaping will happen (as known from preg_replace()). Not taking care of this will most likely create remote code execution vulnerabilities in your application.