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Collator::asort

collator_asort

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

Collator::asort -- collator_asortSort array maintaining index association

Description

Object-oriented style

public Collator::asort(array &$array, int $flags = Collator::SORT_REGULAR): bool

Procedural style

collator_asort(Collator $object, array &$array, int $flags = Collator::SORT_REGULAR): bool

This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order is significant. Array elements will have sort order according to current locale rules.

Equivalent to standard PHP asort().

Parameters

object

Collator object.

array

Array of strings to sort.

flags

Optional sorting type, one of the following:

Default flags value is Collator::SORT_REGULAR. It is also used if an invalid flags value has been specified.

Return Values

Returns true on success or false on failure.

Examples

Example #1 collator_asort() example

<?php
$coll
= collator_create( 'en_US' );
$arr = array(
'a' => '100',
'b' => '50',
'c' => '7'
);
collator_asort( $coll, $arr, Collator::SORT_NUMERIC );
var_export( $arr );

collator_asort( $coll, $arr, Collator::SORT_STRING );
var_export( $arr );
?>

The above example will output:

array (
  'c' => '7',
  'b' => '50',
  'a' => '100',
)array (
  'a' => '100',
  'b' => '50',
  'c' => '7',
)

See Also

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User Contributed Notes 1 note

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0
alix dot axel at NOSPAM dot gmail dot com
13 years ago
For those of you who are looking for a way to integrate natural sorting with the UCA rules this hack seems to work:

<?php

$array
= array
(
'1', '100',
'al', 'be',
'Alpha', 'Beta',
'Álpha', 'Àlpha', 'Älpha',
'かたかな',
'img1.png', 'img2.png',
'img10.png', 'img20.png'
);

echo
'<pre>';
print_r(sortIntl($array, true));
echo
'</pre>';

function
sortIntl($array, $natural = true)
{
$data = $array;

if (
$natural === true)
{
$data = preg_replace_callback('~([0-9]+)~', 'natsortIntl', $data);
}

collator_asort(collator_create('root'), $data);

return
array_intersect_key($array, $data);
}

function
natsortIntl($number)
{
return
sprintf('%032d', $number);
}

?>

Output:

Array
(
[0] => 1
[1] => 100
[2] => al
[3] => be
[4] => Alpha
[5] => Beta
[6] => Álpha
[7] => Àlpha
[8] => Älpha
[9] => かたかな
[10] => img1.png
[11] => img2.png
[12] => img10.png
[13] => img20.png
)
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