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# strcspn

(PHP 3 >= 3.0.3, PHP 4, PHP 5)

strcspn -- Find length of initial segment not matching mask

## 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: 本函数可安全用于二进制对象。

See also strspn().

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