Question

How to sort an array by key in PHP

Answer 1

$arr = array("d"=>"ddd", "c"=>"ccc", "b"=>"bbb", "a"=>"aaa");
ksort($arr);
print_r($arr);

/*
run:

Array ( [a] => aaa [b] => bbb [c] => ccc [d] => ddd ) 

 
*/

 

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Answer 2

$arr = array("d"=>"Australia", "c"=>"France", "b"=>"China", "a"=>"Ireland");
ksort($arr);
print_r($arr);

/*
run:

Array ( [a] => Ireland [b] => China [c] => France [d] => Australia ) 

 
*/

 

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Answer 3

$arr = array("d"=>"Australia", "c"=>"France", "b"=>"China", "a"=>"Ireland");
ksort($arr);
foreach ($arr as $key => $val) 
    echo "$key = $val\n";

/*
run:

a = Ireland b = China c = France d = Australia 

 
*/

 

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