PHP5中文手册·Count the number of substring occurrences -- 追寻梦想＞编程乐园＞PHP 编程

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');
?>

substr_count

说明

参数

返回值

更新日志

范例

参见