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up vote 18 down vote favorite
5
 
$all = array
(
    0 => 307,
    1 => 157,
    2 => 234,
    3 => 200,
    4 => 322,
    5 => 324
);
$search_this = array
(
    0 => 200,
    1 => 234
);

I would like to find out if $all contains all $search_this values and return true or false. any idea please?

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4 Answers 4

up vote 45 down vote accepted

Look at array_intersect().

$containsSearch = count(array_intersect($search_this, $all)) == count($search_this);
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thanks, it works! :) –  peter Mar 11 '12 at 14:36
1  
You know you can omit both count() calls? –  Wrikken Aug 15 '13 at 16:01
    
@Wrikken Can't the values get reordered during array_intersect()? I mean, ['a', 'b'] != ['b', 'a']. –  exizt Oct 16 '13 at 18:57
1  
@exizt: array_intersect() does not alter the input arrays, so $search_this & $all are safe (it just returns an output). The function signature is array array_intersect ( array $array1 , array $array2 [, array $... ] ) (safe). If it would/could alter them, it would be array array_intersect ( array &$array1 , array &$array2 [, array &$... ] ) (possible altering of input arguments). Also, the keys of $search_this are preserve, and the order of the first array is kept. So, both key/value pairs, as their order, match. –  Wrikken Oct 16 '13 at 21:03
2  
And even then: array comparison: "== TRUE if $a and $b have the same key/value pairs.", so the order doesn't even matter (use === for that) –  Wrikken Oct 16 '13 at 21:24
up vote 8 down vote

The previous answers are all doing more work than they need to. This is the simplest way to do it:

$containsAllValues = !array_diff($search_this, $all);

That's all you have to do.

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1  
Thanks for the aha moment; I came in thinking array_intersect. –  Derek Illchuk Jul 4 '14 at 22:24
up vote 1 down vote

A bit shorter with array_diff

$musthave = array('a','b');
$test1 = array('a','b','c');
$test2 = array('a','c');

$containsAllNeeded = 0 == count(array_diff($musthave, $test1));

// this is TRUE

$containsAllNeeded = 0 == count(array_diff($musthave, $test2));

// this is FALSE
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up vote 0 down vote

I think you're looking for the intersect function

array array_intersect ( array $array1 , array $array2 [, array $ ... ] )
array_intersect() returns an array containing all the values of array1 that are 
present in all the arguments. Note that keys are preserved.

http://www.php.net/manual/en/function.array-intersect.php

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thanks, it works! :) –  peter Mar 11 '12 at 14:37

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