strcspn Find length of initial segment not matching mask intstrcspn stringstr1 stringstr2 intstart intlength Returns the length of the initial segment of str1 which does not contain any of the characters in str2. As of PHP 4.3.0, strcspn accepts two optional integer parameters that can be used to define the start position and the length of the string to examine. ¬e.bin-safe; See also strspn.