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int strspn ( string $str1 , string $str2 [, int $start [, int $length ]] )

Finds the length of the initial segment matching mask.

The line of code:

 <?php
$var = strspn("42 is the answer, what is the question ...", "1234567890");
?>

will assign 2 to $var, because the string "42" will be the longest segment containing characters from "1234567890".

str1: The first string.
str2: The second string.
start: The start position of the string to examine. Negative value counts position from the end of a string.
length: The length of the string to examine. Negative value sets length from the end of a string.

Returns the length of the initial segment of str1 which consists entirely of characters in str2 .

Version	Description
4.3.0	The `start` and `length` parameters were added

Example #1 strspn() example

 <?php
echo strspn("foo", "o", 1, 2); // 2
?>

Note: This function is binary-safe.

strspn