Demo: PHP Sort Associative array by Key 

<?php
$array=array("One"=>"Apple","Two"=>"Orange","Three"=>"Mango");
ksort($array);
foreach($array as $key => $value)
   {
   echo "Key=" . $key . ", Value=" . $value;
   echo "<br>";
   }
?>

Output

Key=One, Value=Apple
Key=Three, Value=Mango
Key=Two, Value=Orange

<?php
$array=array("One"=>"Apple","Two"=>"Orange","Three"=>"Mango");
krsort($array);
foreach($array as $key => $value)
   {
   echo "Key=" . $key . ", Value=" . $value;
   echo "<br>";
   }
?>

Output

Key=Two, Value=Orange
Key=Three, Value=Mango
Key=One, Value=Apple
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