Demo: PHP Sort Associative array by Value 

<?php
$array=array("First"=>"HTML","Second"=>"CSS","Third"=>"JavaScript","Fourth"=>"PHP");
asort($array);
foreach($array as $key=>$value)
{
 echo "Key=" . $key . ", Value=" . $value;
 echo "<br>";
}
?>

Output

Key=Second, Value=CSS
Key=First, Value=HTML
Key=Third, Value=Javascript
Key=Fourth, Value=PHP

<?php
$array=array("First"=>"HTML","Second"=>"CSS","Third"=>"JavaScript","Fourth"=>"PHP");
arsort($array);
foreach($array as $key=>$value)
{
 echo "Key=" . $key . ", Value=" . $value;
 echo "<br>";
}
?>

Output

Key=Fourth, Value=PHP
Key=Third, Value=Javascript
Key=First, Value=HTML
Key=Second, Value=CSS
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