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    Collator::compare

    collator_compare

    (PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.0)

    Collator::compare -- collator_compare — Compare two Unicode strings

    Beschreibung

    Objektorientierter Stil

    public Collator::compare(string $string1, string $string2): int|false

    Prozeduraler Stil

    collator_compare(Collator $object, string $string1, string $string2): int|false

    Compare two Unicode strings according to collation rules.

    Parameter-Liste

    object

    Collator object.

    string1

    The first string to compare.

    string2

    The second string to compare.

    Rückgabewerte

    Return comparison result:

    • 1 if string1 is greater than string2 ;

    • 0 if string1 is equal to string2;

    • -1 if string1 is less than string2 .

    Returns false on failure.

    Warnung

    Diese Funktion kann sowohl das boolsche false zurückliefern, als auch einen nicht-boolschen Wert, welcher zu false ausgewertet wird. Weitere Informationen entnehmen Sie bitte dem Abschnitt über die boolschen Typen. Benutzen Sie deshalb den === Operator, um den Rückgabewert dieser Funktion zu überprüfen.

    Beispiele

    Beispiel #1 collator_compare() example

    <?php
    $s1     = 'Hello';
    $s2 = 'hello';

    $coll = collator_create( 'en_US' );
    $res = collator_compare( $coll, $s1, $s2 );

    if (    $res === false) {
    echo     collator_get_error_message( $coll );
    } else if(     $res > 0 ) {
    echo     "s1 is greater than s2\n";
    } else if(     $res < 0 ) {
    echo     "s1 is less than s2\n";
    } else {
    echo     "s1 is equal to s2\n";
    }
    ?>

    Das oben gezeigte Beispiel erzeugt folgende Ausgabe:


    s1 is greater than s2

    Beispiel #2 Comparing strings without diacritics or case-sensitivity

    <?php
    $c     = new Collator( 'en' );
    $c->setStrength( Collator::PRIMARY );

    if (     $c->compare( 'Séan', 'Sean' ) == 0 )
    {
    echo     "The same\n";
    }

    Das oben gezeigte Beispiel erzeugt folgende Ausgabe:


    The same

    This example instructs the collator to compare with only taking the base characters into account. The documentation for Collator->setStrength() explains the different strengths.

    Siehe auch

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    User Contributed Notes 1 note

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    erik at eldata dot se
    3 years ago
    The Collator class with method compare does what the non existing mb_strcmp, mb_strcasecmp, mb_strnatcmp and mb_strnatcasecmp would do for multibyte strings (UTF8) - but better! :-)

    For "case": the Collator is case insensitive due to Collator::CASE_FIRST defaults to Collator::OFF, but can be changed with method setAttribute.

    For "nat" (natural sort order for numbers): use method setAttribute with Collator::NUMERIC_COLLATION and Collator:ON to enable.
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