(PHP 4, PHP 5, PHP 7)
ksort — Sort an array by key
ksort ( array &$array [, int $flags = SORT_REGULAR ] ) : bool
Sorts an array by key, maintaining key to data correlations. This is useful mainly for associative arrays.
array
The input array.
flags
The optional second parameter flags may be used to modify the sorting behavior using these values:
Sorting type flags:
SORT_REGULAR - compare items normally; the details are described in the comparison operators section SORT_NUMERIC - compare items numerically SORT_STRING - compare items as strings SORT_LOCALE_STRING - compare items as strings, based on the current locale. It uses the locale, which can be changed using setlocale() SORT_NATURAL - compare items as strings using "natural ordering" like natsort() SORT_FLAG_CASE - can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively Returns true on success or false on failure.
Example #1 ksort() example
<?php
$fruits = array("d"=>"lemon", "a"=>"orange", "b"=>"banana", "c"=>"apple");
ksort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val\n";
}
?> The above example will output:
a = orange b = banana c = apple d = lemon
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https://www.php.net/manual/en/function.ksort.php