PHP Manual: Count the number of substring occurrences

Description

int substr_count ( string $haystack , string $needle [, int $offset = 0 [, 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!

Parameters

haystack: The string to search in
needle: The substring to search for
offset: The offset where to start counting. If the offset is negative, counting starts from the end of the string.
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. A negative length counts from the end of haystack.

Return Values

This function returns an integer.

Changelog

Version	Description
7.1.0	Support for negative `offset`s and `length`s has been added.
5.1.0	Added the `offset` and the `length` parameters

Examples

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 substrings
$text2 = 'gcdgcdgcd';
echo substr_count($text2, 'gcdgcd');
?>

substr_count

Description

Parameters

Return Values

Changelog

Examples

See Also