strcspn
Description
int strcspn ( string str1, string str2 [, int start [, int length]] )
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.
注意: 本函数可安全用于二进制对象。
See also strspn().