Home >>PHP Array Functions >PHP uasort() Function
PHP uasort() Function
PHP uasort() Function
PHP uasort() function is used to sort the given input array such that the array indexes maintain their relation with their associated array elements using a user-defined function. It accepts two parameters $array and the user defined function name. It returns a boolean value TRUE on success and FALSE on failure as result.
Syntax:
uasort($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 compar ison function. |
Here is an example of uasort() function in PHP:
<html>
<body>
<?php
function compare($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>1,"b"=>2,"c"=>10,"d"=>66,"e"=>5);
uasort($arr,"compare");
foreach($arr as $x=>$value)
{
echo "Key =" . $x . ", Value =" . $value;
echo "<br>";
}
?>
</body>
</html>
Output:
Key =a, Value =1
Key =b, Value =2
Key =e, Value =5
Key =c, Value =10
Key =d, Value =66
Key =a, Value =1
Key =b, Value =2
Key =e, Value =5
Key =c, Value =10
Key =d, Value =66
Example 2:
<html>
<body>
<pre>
<?php
function compare($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>1,"b"=>2,"c"=>10,"d"=>66,"e"=>5,"f"=>25,"g"=>31);
uasort($arr,"compare");
print_r($arr);
?>
</pre>
</body>
</html>
Output:
Array
(
[a] => 1
[b] => 2
[e] => 5
[c] => 10
[f] => 25
[g] => 31
[d] => 66
)
No Sidebar ads