str_contains

Function name: str_contains()

Function Description: This function is used to check whether a string contains another string.

Applicable version: PHP 8.0.0 and above

usage:

 bool str_contains ( string $haystack , string $needle )

parameter:

• $haystack : The string to search for.
• $needle : The substring to search for.

Return value: true if $haystack contains $needle , otherwise false .

Example:

 $str = "Hello, world!"; $substring = "world"; if (str_contains($str, $substring)) { echo "字符串中包含子字符串"; } else { echo "字符串中不包含子字符串"; }

Output:

字符串中包含子字符串

Notes:

• str_contains() function is case-sensitive. If you need to do case-insensitive searches, you can use the stripos() function.
• In versions before PHP 8.0.0, you can use the strpos() function to check whether a string contains another string, but you need to manually determine whether the return value is false . After PHP 8.0.0, it is recommended to use str_contains() function because it is more concise and intuitive.