substr_count() 함수

int substr_count ( string $haystack , string $needle [, int $offset= 0 [, int $length ]] )

— Count the number of substring occurrences
해당 글에(string $haystack)에 string $needle 글자가 몇번 있는지 세는 함수

[
  int $offset -> 몇번째 글 부터 찾을 건지
  int $length  -> 몇번째 글 까지 찾을 건지
]

$text = 'This is a test';
echo strlen($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');

결과값:
14

2

1

0


Warning: substr_count() [function.substr-count]: Length value 10 exceeds string length. in -------------.php on line 17


1


참고: http://kr.php.net/manual/kr/function.substr-count.php