PHP strspn() Function

Return the number of characters found in the string "Hello world!" that contains the characters "kHlleo":

<?php
echo strspn("Hello world!","kHlleo");
?>

Definition and Usage

The strspn() function returns the number of characters found in the string that contains only characters from the charlist parameter.

Tip: Use the strcspn() function to return the number of characters found in a string before any part of the specified characters are found.

Note: This function is binary-safe.

strspn(string,charlist,start,length)

Parameter	Description
string	Required. Specifies the string to search
charlist	Required. Specifies the characters to find
start	Optional. Specifies where in the string to start
length	Optional. Defines the length of the string

Return Value:	Returns the number of characters found in the string that contains only characters from the charlist parameter.
PHP Version:	4+
Changelog:	The start and length parameters were added in PHP 4.3.

Return the number of characters found in the string "abcdefand" that contains the characters "abc":

<?php
echo strspn("abcdefand","abc");
?>