sort()

The sort() method sorts the given array in ascending order.

Syntax

sort($array, $sort_flags = SORT_REGULAR)

The sort() function has one required parameter, $array, which specifies the input array. The sort() function also has one optional parameter, $sort_flags, which specifies the sorting type. The default sorting type is SORT_REGULAR. The following sorting types are available:

This function assigns new keys to the elements in $array. It will remove any existing keys that may have been assigned, rather than just reordering the keys.

It always returns true.

Example

The following example uses the sort() function to sort the array $cars. Since $cars contain strings, the items are sorted alphabetically in ascending order.

<?php
$cars = array("Toyota Camry","Honda Civic","Ford Mustang","Chevrolet Corvette");
sort($cars);
foreach ($cars as $key => $val) {
    echo "cars[" . $key . "] = " . $val . "\n";
}
?>

The example will result in the following output:

cars[0] = Chevrolet Corvette
cars[1] = Ford Mustang
cars[2] = Honda Civic
cars[3] = Toyota Camry

Codebyte Example

In the following codebyte example $cars is sorted using the SORT_NATURAL and SORT_FLAG_CASE flags. This performs a case-insensitive natural ordering sort, whereas the previous example performed a case-sensitive alphabetical sort.

So, the string "Toyota Camry 1982" is sorted before "toyota Camry 1991". This is because the SORT_NATURAL flag sorts the strings based on their numeric values, and the SORT_FLAG_CASE flag sorts the strings case-insensitively. The SORT_NATURAL flag is only available as of PHP 5.4.0.

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