It finds the intersection of arrays using keys for comparison

Example

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

Output

Array
(
[a] => PHP
[b] => ASP
[0] => VB
)

It finds the intersection of arrays with additional index check

Example

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

Output

Array
(
[a] => PHP
)

It exchanges all keys with their associated values in an array

Example

<?php
echo “<pre>”;
$array1 = array(“ASP” => WEB, “PHP” => WEB, “JSP” => SEREVR);
$array2 = array_flip($array1);
print_r($array2);
?>

Output

AArray
(
[WEB] => PHP
[SEREVR] => JSP
)

It filters elements of an array using a callback function

Example

<?php
function checkOdd($arg){
return($arg & 1);
}
echo “<pre>”;
$array1 = array(1,2, 3, 4, 5, 17, 12);
print_r(array_filter($array1, “checkOdd”));
?>

Output

Array
(
[0] => 1
[2] => 3
[4] => 5
[5] => 17
)

It fills an array with the given values

Example

<?php
echo “<pre>”;
$array = array_fill(5,6,”PHP”);
print_r($array);
?>

Output

Array
(
[5] => PHP
[6] => PHP
[7] => PHP
[8] => PHP
[9] => PHP
[10] => PHP
)

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
)