(PHP 5 >= 5.2.0, PHP 7, PHP 8)
mb_stristr — Finds first occurrence of a string within another, case insensitive
mb_stristr( string $haystack, string $needle, bool $before_needle = false, ?string $encoding = null ): string|false
mb_stristr() finds the first occurrence of needle in haystack and returns the portion of haystack. Unlike mb_strstr(), mb_stristr() is case-insensitive. If needle is not found, it returns false.
haystack The string from which to get the first occurrence of needle
needle The string to find in haystack
before_needle Determines which portion of haystack this function returns. If set to true, it returns all of haystack from the beginning to the first occurrence of needle (excluding needle). If set to false, it returns all of haystack from the first occurrence of needle to the end (including needle).
encodingThe encoding parameter is the character encoding. If it is omitted or null, the internal character encoding value will be used.
Returns the portion of haystack, or false if needle is not found.
| Version | Description |
|---|---|
| 8.0.0 | needle now accepts an empty string. |
| 8.0.0 | encoding is nullable now. |
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https://www.php.net/manual/en/function.mb-stristr.php