php 한글 메뉴얼 도움말 검색 사이트 Count the number of substring occurrences [function.substr-count]

설명

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!

인수

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.

반환값

This function returns an integer.

변경점

버전	설명
5.1.0	Added the `offset` and the `length` parameters

예제

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');
?>

참고

count_chars() - 문자열 안에 사용한 문자에 대한 정보를 반환
strpos() - 문자열이 처음 나타나는 위치를 찾습니다
substr() - Return part of a string
strstr() - 문자열이 처음으로 나오는 부분을 찾습니다