How to get common values from two different arrays in PHP

Question

I have two arrays with some user-id

$array1 = array("5","26","38","42");

$array2 = array("15","36","38","42");

What I need is, I need the common values from the array as follows

$array3 = array(0=>"38", 1=>"42");

I have tried array_intersect(). I would like to get a method that takes a minimum time of execution. Please help me, friends.

What's wrong with `array_intersect`? It can't possibly be too slow? — deceze, Jul 15 '13 at 07:38
This might help:: http://stackoverflow.com/questions/6329211/php-array-intersect-efficiency/6329494#6329494 — Sudhir Bastakoti, Jul 15 '13 at 07:39
Good luck: http://www.php.net/manual/en/internals2.structure.php — Dek Dekku, Jul 15 '13 at 07:43
[Here's how `array_intersect` is implemented](http://lxr.php.net/xref/PHP_5_4/ext/standard/array.c#php_array_intersect) and [here's how it's called internally](http://lxr.php.net/xref/PHP_5_4/ext/standard/array.c#3280). Try to improve algorithm for better performance. — Leri, Jul 15 '13 at 07:44
Could any one please tell me why my question get vote down??? i just want to know is there any other better function for the same. Thanks all of you who response to my question... :) — Nevin Thomas, Jul 15 '13 at 07:48
Dunno why everyone down voted this seems pretty fair what you asking — Purple Hexagon, Feb 06 '14 at 16:06

score 37 · Accepted Answer · answered Jul 15 '13 at 07:35

37

Native PHP functions are faster than trying to build your own algorithm.

$result = array_intersect($array1, $array2);

answered Jul 15 '13 at 07:35

Expedito

7,771
5
30
43

1

is there I can loop through the values of $result? I understand that the $result variable will give me an array of key value pairs...but now I only want the values, not the keys. – Sidney Sousa Nov 14 '18 at 15:29

score 3 · Answer 2 · answered Jul 15 '13 at 07:37

3

Use this one, though this maybe a long method:

$array1 = array("5","26","38","42");

$array2 = array("15","36","38","42");

$final_array = array();

foreach($array1 as $key=>$val){
    if(in_array($val,$array2)){
        $final_array[] = $val;
    }
}

print_r($final_array);

Result: Array ( [0] => 38 [1] => 42 )

answered Jul 15 '13 at 07:37

JunM

7,040
7
37
58

2

can you suggest a reason why your answer is better choice over array_intersect... – Sir Jul 15 '13 at 07:39

score 1 · Answer 3 · answered Jul 15 '13 at 07:48

array_intersect() works just fine.

array array_intersect ( array $array1 , array $array2 [, array $ ... ] )

$array1 = array("5","26","38","42");

$array2 = array("15","36","38","42");

echo array_intersect($array1, $array2);

http://fr2.php.net/array_intersect

score 0 · Answer 4 · edited Jul 15 '13 at 07:43

0

I think you don't need to use $key=>$value to your problem so check this answer:

<?php
$array1 = array("5", "26", "38", "42");
$array2 = array("15", "36", "38", "42");

foreach ($array1 as $value) {
    if (in_array($value, $array2)) {
        $array3[] = $value;
    }
}

print_r($array3);
?>

edited Jul 15 '13 at 07:43

Wolph

78,177
11
137
148

answered Jul 15 '13 at 07:39

gayan

212
1
3

How to get common values from two different arrays in PHP

4 Answers4

Linked

Related