It fills an array with values, specifying keys

Example

<?php
echo “<pre>”;
$keys = array(‘PHP’, VB, ASP, ‘JSP’);
$a = array_fill_keys($keys, ‘WEB’);
print_r($a);
?>

Output

Array
(
[PHP] => WEB
[VB] => WEB
[ASP] => WEB
[JSP] => WEB
)

It finds the difference of arrays

Example

<?php
echo “<pre>”;
$array1 = array(“a” => “PHP”, “b” => “ASP”, “c” => “JSP”, “VB”);
$array2 = array(“a” => “PHP”, “ASP”, “JSP”);
$array3 = array_diff($array1, $array2);
print_r($array3);
?>

Output

Array
(
[0] => VB
)

It computes the difference of arrays using a callback function on the keys for comparison

Example

<?php
function fun1($arg1, $arg2){
if ($arg1 === $arg2)     return 0;
return ($arg1 > $arg2)? 1:-1;
}
echo “<pre>”;
$array1 = array(“a” => “PHP”, “b” => “ASP”, “c” => “JSP”, “VB”);
$array2 = array(“a” => “PHP”, “ASP”, “JSP”);
$array3 = array_diff_ukey($array1, $array2, “fun1”);
print_r($array3);
?>

Output

Array
(
[b] => ASP
[c] => JSP
)

It computes the difference of arrays with additional index check which is performed by a user supplied callback function

Example

<?php
function fun1($arg1, $arg2){
if ($arg1 === $arg2)     return 0;
return ($arg1 > $arg2)? 1:-1;
}
echo “<pre>”;
$array1 = array(“a” => “PHP”, “b” => “ASP”, “c” => “JSP”, “VB”);
$array2 = array(“a” => “PHP”, “ASP”, “JSP”);
$array3 = array_diff_uassoc($array1, $array2, “fun1”);
print_r($array3);
?>

Output

Array
(
[b] => ASP
[c] => JSP
[0] => VB
)

It computes the difference of arrays using keys for comparison

Example

<?php
echo “<pre>”;
$array1 = array(‘JSP’  => 1, ‘PHP’  => 2, ‘ASP’  => 3);
$array2 = array(‘JAVA’ => 5, ‘VB’ => 6, ‘PHTML’ => 7);
print_r(array_diff_key($array1, $array2));
?>

Output

Array
(
[JSP] => 1
[PHP] => 2
[ASP] => 3
)

It computes the difference of arrays with additional index check

Example

<?php
echo “<pre>”;
$array1 = array(“a” => “PHP”, “b” => “JSP”, “c” => “ASP”, “red”);
$array2 = array(“a” => “green”, “yellow”, “red”);
$array3 = array_diff_assoc($array1, $array2);
print_r($array3);
?>

Output

Array
(
[a] => PHP
[b] => JSP
[c] => ASP
[0] => red
)

It counts all the values of an array

Example

<?php
echo “<pre>”;
$array = array(PHP, “ASP”, PHP, “ASP”, “PHP”);
print_r(array_count_values($array));
?>

Output

Array
(
[PHP] => 3
[ASP] => 2
)

It creates an array by using one array for keys and another for its values

Example

<?php
echo “<pre>”;
$array1 = array(‘PHP’, ‘ASP’, ‘JSP’);
$array2 = array(‘Javascript’, ‘VBScript’, ‘ActionScript’);
$array3 = array_combine($array1, $array2);
print_r($array3);
?>

Output

Array
(
[PHP] => Javascript
[ASP] => VBScript
[JSP] => ActionScript
)

It converts the keys of an array into uppercase

Example

<?php
echo “<pre>”;
$array = array(“FirSt” => 17, “SecOnd” => 7);
print_r(array_change_key_case($array, CASE_UPPER));
?>

Output

Array
(
[FIRST] => 17
[SECOND] => 7
)