mb_stripos

Function name: mb_stripos()

Applicable version: PHP 4 >= 4.2.0, PHP 5, PHP 7

Function Description: The mb_stripos() function looks for another string (case insensitive). Similar to the stripos() function, but mb_stripos() supports multibyte characters.

Syntax: mb_stripos(string $haystack, string $needle, int $offset = 0, string $encoding = mb_internal_encoding()): int|false

parameter:

• $haystack: A string in which to look for a substring.
• $needle: The substring to be found.
• $offset (optional): Starts searching from the specified location of the string.
• $encoding (optional): Specify character encoding, default to internal character encoding.

Return value:

• If a substring is found, it returns its position in the string (index starting at 0).
• If no substring is found, false is returned.

Example:

 $haystack = "Hello, World!"; $needle = "world"; $position = mb_stripos($haystack, $needle); if ($position !== false) { echo "找到子字符串，位置为：" . $position; } else { echo "未找到子字符串"; }

Output:

找到子字符串，位置为：7

Notes:

• The mb_stripos() function is case-insensitive. If you need a case-sensitive search, please use the mb_stripos() function.
• If the specified string encoding is invalid, a warning will be thrown.