What is strcspn in PHP?
The strcspn function in PHP is used to find the length of a substring before a specific character in the string is found.
Note: The
strcspnfunction is not binary-safe.
Syntax
strcspn(
string $string,
string $characters,
int $offset = 0,
?int $length = null
): int
Parameters
strcspn requires two mandatory parameters:
string: the string to search in.characters: the string that contains any disallowed character (note: can be more than one).
In addition, the strcspn function also accepts:
offset: specifies the position to start searching the string; set to0by default.length: specifies the length of the string to search in; set tonullby default.
Return value
The strcspn function returns the length of the string until it finds a character in characters.
Code
In the example below, we check three different strings.
<?phpvar_dump(strcspn('abcd', 'b'));var_dump(strcspn('hello educative!', '!', 5));var_dump(strcspn('hello educative!', '!', 5, 3));
Note: In the third case, there is no
!in the substring, so the output is the length of the substring.