Edit Report a Bug

    stripos

    (PHP 5, PHP 7)

    stripos — Find the position of the first occurrence of a case-insensitive substring in a string

    Descrierea

    stripos ( string $haystack , string $needle , int $offset = 0 ) : int|false

    Find the numeric position of the first occurrence of needle in the haystack string.

    Unlike the strpos(), stripos() is case-insensitive.

    Parametri

    haystack

    The string to search in.

    needle

    Note that the needle may be a string of one or more characters.

    Dacă needle nu este un șir de caractere, el este transformat în întreg și aplicat ca valoarea ordinală a caracterului. Acest comportament este învechit începând cu PHP 7.3.0 și utilizarea lui este foarte nerecomandată. În dependență de comportamentul dorit needle trebuie transformat în mod explicit în șir de caractere, sau trebuie efectuat un apel explicit către chr().

    offset

    If specified, search will start this number of characters counted from the beginning of the string. If the offset is negative, the search will start this number of characters counted from the end of the string.

    Valorile întoarse

    Returns the position of where the needle exists relative to the beginnning of the haystack string (independent of offset). Also note that string positions start at 0, and not 1.

    Returns false if the needle was not found.

    Avertizare

    Această funcție poate întoarce valoarea Boolean false, dar poate de asemenea întoarce o valoare non-Boolean care evaluează în false. Vă rugăm să citiți secțiunea despre tipul Boolean pentru informații suplimentare. Utilizați operatorul === pentru a verifica valoarea întoarsă de această funcție.

    Istoricul schimbărilor

    Versiune Descriere
    8.0.0 Passing an int as needle is no longer supported.
    7.3.0 Passing an int as needle has been deprecated.
    7.1.0 Support for negative offsets has been added.

    Exemple

    Example #1 stripos() examples

    <?php
    $findme        = 'a';
    $mystring1 = 'xyz';
    $mystring2 = 'ABC';

    $pos1 = stripos($mystring1, $findme);
    $pos2 = stripos($mystring2, $findme);

    // Nope, 'a' is certainly not in 'xyz'
    if ($pos1 === false) {
        echo     "The string '$findme' was not found in the string '$mystring1'";
    }

    // Note our use of ===.  Simply == would not work as expected
    // because the position of 'a' is the 0th (first) character.
    if ($pos2 !== false) {
        echo     "We found '$findme' in '$mystring2' at position $pos2";
    }
    ?>

    Note

    Notă: Această funcție acceptă și date binare.

    A se vedea și

    • mb_stripos() - Finds position of first occurrence of a string within another, case insensitive
    • str_contains() - Determine if a string contains a given substring
    • str_ends_with() - Checks if a string ends with a given substring
    • str_starts_with() - Checks if a string starts with a given substring
    • strpos() - Find the position of the first occurrence of a substring in a string
    • strrpos() - Find the position of the last occurrence of a substring in a string
    • strripos() - Find the position of the last occurrence of a case-insensitive substring in a string
    • stristr() - Case-insensitive strstr
    • substr() - Return part of a string
    • str_ireplace() - Case-insensitive version of str_replace

    add a note add a note

    User Contributed Notes 5 notes

    up
    43
    emperorshishire at gmail dot com
    15 years ago
    I found myself needing to find the first position of multiple needles in one haystack.  So I wrote this little function:

    <?php
    function multineedle_stripos($haystack, $needles, $offset=0) {
        foreach(    $needles as $needle) {
                $found[$needle] = stripos($haystack, $needle, $offset);
        }
        return     $found;
    }

    // It works as such:
    $haystack = "The quick brown fox jumps over the lazy dog.";
    $needle = array("fox", "dog", ".", "duck")
    var_dump(multineedle_stripos($haystack, $needle));
    /* Output:
       array(3) {
         ["fox"]=>
         int(16)
         ["dog"]=>
         int(40)
         ["."]=>
         int(43)
         ["duck"]=>
         bool(false)
       }
    */
    ?>
    up
    6
    sorrynorealemail at example dot com
    6 years ago
    Unlike strpos() it seems that stripos() does NOT issue a WARNING if the needle is an empty string ''.
    up
    4
    spam at kleppinger dot com
    9 years ago
    Regarding the function by spam at wikicms dot org

    It is very bad practice to use the same function name as an existing php function but have a different output format.  Someone maintaining the code in the future is likely to be very confused by this.  It will also be hard to eradicate from a codebase because the naming is identical so each use of stripos() would have to be analyzed to see how it is expecting the output format (bool or number/bool).

    Calling it string_found() or something like that would make a lot more sense for long-term use.
    up
    4
    Ian Macdonald
    9 years ago
    Regarding the === note, it might be worth clarifying that the correct tests for a binary found/not found condition are  !==false to detect found, and ===false to detect not found.
    up
    2
    emanuel dot karlsson at rolfsbuss dot se
    6 years ago
    Finding numbers in strings requires you to cast the number to string first.

    strpos("123", 2) !== strpos("123", "2")
    add a note add a note
    To Top