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PHP5中文手册

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'33);

// generates a warning because 5+10 > 14
echo substr_count($text'is'510);


// prints only 1, because it doesn't count overlapped subtrings
$text2 'gcdgcdgcd';
echo 
substr_count($text2'gcdgcd');
?>