Podręcznik PHP
Poprzedni		Następny

substr_count

(PHP 4, PHP 5)

substr_count -- Count the number of substring occurrences

Opis

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.

Notatka: This function doesn't count overlapped substrings. See the example below!

Parametry

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.

Zwracane wartości

This functions returns an integer.

Rejestr zmian

Wersja	Opis
5.1.0	Added the `offset` and the `length` parameters

Przykłady

Przykład 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');
?>

Patrz także

count_chars()

strpos()

substr()

strstr()

Poprzedni	Spis treści	Następny
substr_compare	Początek rozdziału	substr_replace