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The asort Function

The asort function sorts an array in ascending order while preserving keys. The function modifies the array itself.

Syntax

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

Example

Let's sort an associative array in ascending order by values:

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

Code execution result:

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

See Also

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

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