substr_count
(PHP 4, PHP 5)
substr_count — Count the number of substring occurrences
说明
int substr_count
( string $haystack
, string $needle
[, int $offset
[, int $length
]] )
substr_count() returns the number of times the needle substring occurs in the haystack string. Please note that needle is case sensitive.
Note: This function doesn't count overlapped substrings. See the example below!
参数
- haystack
-
The string to search in
- needle
-
The substring to search for
- offset
-
The offset where to start counting
- length
-
The maximum length after the specified offset to search for the substring. It outputs a warning if the offset plus the length is greater than the haystack length.
返回值
This functions returns an integer.
更新日志
| 版本 | 说明 |
|---|---|
| 5.1.0 | Added the offset and the length parameters |
范例
Example#1 A substr_count() example
<?php
$text = 'This is a test';
echo strlen($text); // 14
echo substr_count($text, 'is'); // 2
// the string is reduced to 's is a test', so it prints 1
echo substr_count($text, 'is', 3);
// the text is reduced to 's i', so it prints 0
echo substr_count($text, 'is', 3, 3);
// generates a warning because 5+10 > 14
echo substr_count($text, 'is', 5, 10);
// prints only 1, because it doesn't count overlapped subtrings
$text2 = 'gcdgcdgcd';
echo substr_count($text2, 'gcdgcd');
?>
