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The arsort Function

The arsort function sorts an array in descending order while preserving keys. The function modifies the array itself.

Syntax

arsort(array &$array, int $flags = SORT_REGULAR): bool

Let's sort an associative array in descending order:

<?php
	$arr = [
		'b' => 1,
		'e' => 3,
		'c' => 2,
		'a' => 5,
		'd' => 4,
	];
	
	arsort($arr);
	var_dump($arr);
?>

Code execution result:

[
	'd' => 4,
	'e' => 3,
	'c' => 2,
	'b' => 1,
	'a' => 5,
]

the sort function,
which sorts in ascending order
the rsort function,
which sorts in descending order
the ksort function,
which sorts by keys in ascending order
the krsort function,
which sorts by keys in descending order
the asort function,
which sorts in ascending order while preserving keys
the arsort function,
which sorts in descending order while preserving keys
the natsort function,
which sorts using natural order algorithm
the natcasesort function,
which sorts using natural order algorithm case-insensitively
the usort function,
which sorts using a callback function
the uksort function,
which sorts by keys using a callback function
the uasort function,
which sorts using a callback function while preserving keys
the array_multisort function,
which sorts multiple arrays

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