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

说明

面向对象风格

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

过程化风格

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

Compare two Unicode strings according to collation rules.

参数

object: Collator object.
string1: The first string to compare.
string2: The second string to compare.

返回值

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.

警告

此函数可能返回布尔值 false，但也可能返回等同于 false 的非布尔值。请阅读布尔类型章节以获取更多信息。应使用 === 运算符来测试此函数的返回值。

范例

示例 #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";
}
?>

以上例程会输出：

s1 is greater than s2

示例 #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";
}

以上例程会输出：

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.

参见

collator_sort() - Sort array using specified collator

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User Contributed Notes 1 note

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erik at eldata dot se ¶

1 year 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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