strspn
(PHP 4, PHP 5)
strspn — Find length of initial segment matching mask
說明
int strspn
( string $str1
, string $str2
[, int $start
[, int $length
]] )
Finds the length of the initial segment matching mask.
The line of code:
<?php
$var = strspn("42 is the answer, what is the question ...", "1234567890");
?>
參數
- str1
-
The first string.
- str2
-
The second string.
- start
-
The start position of the string to examine. Negative value counts position from the end of a string.
- length
-
The length of the string to examine. Negative value sets length from the end of a string.
Return值
Returns the length of the initial segment of str1 which consists entirely of characters in str2 .
更新日誌
版本 | 說明 |
---|---|
4.3.0 | The start and length parameters were added |
範例
Example#1 strspn() example
<?php
echo strspn("foo", "o", 1, 2); // 2
?>
註釋
Note: 本函式可安全用於二進位對象。