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    strcspn

    (PHP 4, PHP 5, PHP 7)

    strcspn — 마스크에 매칭하지 않는 처음 세그먼트의 길이를 찾습니다

    설명

    int strcspn ( string $str1 , string $str2 [, int $start [, int $length ]] )

    str1에서 str2 내의 어떠한 문자도 포함하지 않는 첫번째 세그먼트의 길이를 반환합니다.

    인수

    str1

    첫번째 문자열.

    str2

    두번째 문자열.

    start

    검사할 문자열의 시작 위치.

    length

    검사할 문자열의 길이.

    반환값

    세그먼트의 길이를 정수로 반환합니다.

    변경점

    버전 설명
    4.3.0 start와 length 추가

    주의

    Note: 이 함수는 바이너리 안전입니다.

    참고

    • strspn() - 마스크에 매치하는 초기 세그먼트의 길이를 찾는다

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    User Contributed Notes 5 notes

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    8
    maskedcoder at hotmail dot com
    19 years ago
    useful for finding beginning of quotes and/or tags in a variable containing html. 
        $pos = strcspn($data, '<"\'');
    will find the first occurance of either the beginning of a tag, or a double- or single-quoted string.
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    6
    AT-HE (at_he AT hotmai1 DOT com)
    18 years ago
    this function can be used like strspn(), except while that can be used to compare a string with an allowed pattern, this one can be use to compare a string with a FORBIDDEN pattern

    so, to know if any forbidden character has a position inside our string, we can use (not tested with backslashes)...

    <?php
    // LARGE VERSION
    $forbidden="\"\\?*:/@|<>";
    if (    strlen($filename) != strcspn($filename,$forbidden)) {
        echo     "you cant create a file with that name!";
    }

    // SHORT VERSION
    if (strlen($filename) - strcspn($filename,"\"\\?*:/@|<>")) {
        echo     "i told you, you cant create that file";
    }
    ?>
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    2
    legacyprog at routinz dot net
    13 years ago
    When you use the third parameter remember that the function will return the number of characters it bypassed, which will *not* be the position in your source string.  It's a simple fix to just add your third parameter value to the function result to get the position in the first string where the scan stopped, but I didn't think of it at first.
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    0
    nospam at nospam dot com
    8 years ago
    It might not be clear from the example, that

    strcspn('abcdhelloabcd', 'abcd', -9, -5) == 4

    because it's only evaluating 'hell' which doesn't contain any mask, so returns strlen('hell').
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    0
    Anonymous
    15 years ago
    strcspn() can also be thought of as analogous to the following regular expression:
    <?php
    // where ... represents the mask of characters
    preg_match('/[^ ...]/', substr($subject, $start, $length) );
    ?>
    By this analogy, strcspn() can be used in place of some regular expressions to match a pattern without the overhead of a regex engine -- for example, ways to verify if an input string represents a binary value:
    <?php
    preg_match    ('/^[01]+$/i', $subject);
    // or...
    !preg_match('/[^01]/i', $subject);

    // ...or using strcspn()
    !strcspn($subject, '01');
    ?>
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