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substr_count
Podręcznik PHP
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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

WersjaOpis
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()

PoprzedniSpis treściNastępny
substr_comparePoczątek rozdziału