PHP: Count the number of substring occurrences

Description

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!

Parameters

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.

Return Values

This functions returns an integer.

ChangeLog

Version Description

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 subtrings

$text2 = 'gcdgcdgcd';

echo substr_count($text2, 'gcdgcd');

?>

substr_count

Description

Parameters

Return Values

ChangeLog

Examples

See Also