   #PHP Manual String functions strrpos strstr

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                                    strspn

   (PHP 3>= 3.0.3, PHP 4 )
   strspn --  Find length of initial segment matching mask

Description

   int strspn ( string str1, string str2)

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

   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".

   See also strcspn().
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