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up vote 0 down vote favorite

I have an array of array . Example like 

a[0]={1,2,3};
a[1]={2,3,4};
**Edit** in a[2] from a[2]={4,5};
a[2]={2,4,5};
and more

How can I find common element which exist in all array ?

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4 Answers

up vote 1 down vote accepted

You can avoid foreach loop by

call_user_func_array('array_intersect',$a);
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up vote 4 down vote

This is a function I have made. It's just a reference for a multidimensional array.

<?php
$array1 = array('angka'=>12,'satu','2'=>'dua','tiga'=>array('dua','enam','empat'=>array('satu','lima',12)));//object
$array2 = array('dua','tiga','empat',12);//object as intersect refference

function intersect($data=NULL)
{
    if(!empty($data))
    {
        $crashed = array();
        $crashed2 = array();
        foreach($data[0] as $key=>$val)
        {
            if(!is_array($val))
            {
                $crashed[$key] = in_array($val,$data[1]);//return true if crashed (intersect)
            }
            else
            {
                $crashed2[$key] = intersect(array($val,$data[1]));
            }
            $crashed = array_merge($crashed,$crashed2);
        }
    }
    return $crashed;
}
$intersect = intersect(array($array1,$array2));
print_r($intersect);
?>

It returns a result like this:

Array ( [angka] => 1 [0] => [1] => 1 [tiga] => Array ( [0] => 1 [1] => [empat] => Array ( [0] => [1] => [2] => 1 ) ) )

It returns true if the value of an array matches with a reference array.

Hope the code can help you.

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thanks for good try :) –  RDC Dec 14 '12 at 11:08
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up vote 2 down vote

Have a look here array-intersect. You could use it like this:

$intersect = $a[0];
for ($i = 1; $i < count($a); $i++)
{
    $intersect = array_intersect($intersect, $a[$i]);
}
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that works on only two array . I need on multiple array. –  Vivek Goel Aug 7 '11 at 9:44
    
@Vivek, Aha. How about using a loop ? –  Anna Fr. Aug 7 '11 at 9:45
    
Read the manual php.net/manual/en/function.array-intersect.php it works on as many arrays as you want. –  vascowhite Aug 7 '11 at 9:45
    
@vascowhite that's true .. But probably the length of the array $a is variable, so he can't just do array_intersect($a[0], $a[1], ...., $a[50]) –  Anna Fr. Aug 7 '11 at 9:48
    
nice . but I will use foreach loop. –  Vivek Goel Aug 7 '11 at 9:49
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up vote 0 down vote

As the name suggest, I think you can just use array-intersect

From that page:

<?php
$array1 = array("a" => "green", "red", "blue");
$array2 = array("b" => "green", "yellow", "red");
$result = array_intersect($array1, $array2);
print_r($result);
?>

gives

Array
(
    [a] => green
    [0] => red
)
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