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PHP uksort() Function
PHP uksort() Function
PHP uksort() function is used to sort the given input array according to its keys and not to the values using a user-defined comparison function. It accepts two parameters $array and the user-defined function name. It returns a boolean value TRUE on success and FALSE on failure as result.
Syntax:
uksort($array, function);
Parameter Values
| Parameter | Description |
|---|---|
| array | This is a required parameter. It defines the array to sort. |
| function | This is an optional parameter. It defines the callable comparison function. |
Here is an example of uksort() function in PHP:
<html>
<body>
<?php
function compare($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>1,"b"=>2,"c"=>10,"d"=>66,"e"=>5);
uksort($arr,"compare");
foreach($arr as $x=>$value)
{
echo "Key =" . $x . ", Value =" . $value;
echo "<br>";
}
?>
</body>
</html>
Output:
Key =a, Value =1
Key =b, Value =2
Key =c, Value =10
Key =d, Value =66
Key =e, Value =5
Key =a, Value =1
Key =b, Value =2
Key =c, Value =10
Key =d, Value =66
Key =e, Value =5
Example 2:
<html>
<body>
<pre>
<?php
function compare($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>1,"b"=>2,"c"=>10,"d"=>66,"e"=>5,"f"=>25,"g"=>31);
uksort($arr,"compare");
print_r($arr);
?>
</pre>
</body>
</html>
Output:
Array
(
[a] => 1
[b] => 2
[c] => 10
[d] => 66
[e] => 5
[f] => 25
[g] => 31
)
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