Collator::compare

collator_compare

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

Collator::compare -- collator_compareCompare two Unicode strings

Description

Object-oriented style

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

Procedural style

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

Compare two Unicode strings according to collation rules.

Parameters

object

Collator object.

string1

The first string to compare.

string2

The second string to compare.

Return Values

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.

Warning

This function may return Boolean false, but may also return a non-Boolean value which evaluates to false. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Examples

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";}?>

The above example will output:


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";}

The above example will output:


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.

See Also