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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.

> 備注:這個函數可安全的使用於二進位。

See also strspn().

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