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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

    Descrizione

    Stile orientato agli oggetti

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

    Stile procedurale

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

    Compare two Unicode strings according to collation rules.

    Elenco dei parametri

    object

    Collator object.

    string1

    The first string to compare.

    string2

    The second string to compare.

    Valori restituiti

    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.

    Avviso

    Questa funzione può restituire il Booleano false, ma può anche restituire un valore non-Booleano valutato come false. Fare riferimento alla sezione Booleans per maggiori informazioni. Usare l'operatore === per controllare il valore restituito da questa funzione.

    Esempi

    Example #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";
    }
    ?>

    Il precedente esempio visualizzerà:


    s1 is greater than s2

    Example #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";
    }

    Il precedente esempio visualizzerà:


    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.

    Vedere anche:

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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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