Question

How to sort several (multiple) arrays at once in PHP

Answer 1

$arr1 = array( 1,  3,   2,  5, 4);
$arr2 = array(30, 30, 100, 20, 1);
array_multisort($arr1, $arr2);

print_r($arr1);
echo "<br />";
print_r($arr2);

// $arr2 corresponding to the identical entries in $arr1

/*
run:
 
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
Array ( [0] => 30 [1] => 100 [2] => 30 [3] => 1 [4] => 20 ) 
 
*/

 

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Answer 2

$arr1 = array(30, 30, 100, 20, 1);
$arr2 = array( 1,  3,   2,  5, 4);
array_multisort($arr1, $arr2);

print_r($arr1);
echo "<br />";
print_r($arr2);

// $arr2 corresponding to the identical entries in $arr1

/*
run:
 
Array ( [0] => 1 [1] => 20 [2] => 30 [3] => 30 [4] => 100 )
Array ( [0] => 4 [1] => 5 [2] => 1 [3] => 3 [4] => 2 ) 
 
*/

 

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