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PHP - Check if two arrays are equal


Question

I'd like to check if two arrays are equal. I mean: same size, same index, same values. How can I do that?

Using !== as suggested by a user, I expect that the following would print enter if at least one element in the array(s) are different, but in fact it does not.

if (($_POST['atlOriginal'] !== $oldAtlPosition) 
    or ($_POST['atl'] !== $aext) 
    or ($_POST['sidesOriginal'] !== $oldSidePosition) 
    or ($_POST['sidesOriginal'] !== $sideext)) {

    echo "enter";
}
2019/07/18
1
284
7/18/2019 10:39:20 PM

Accepted Answer

$arraysAreEqual = ($a == $b); // TRUE if $a and $b have the same key/value pairs.
$arraysAreEqual = ($a === $b); // TRUE if $a and $b have the same key/value pairs in the same order and of the same types.

See Array Operators.

EDIT

The inequality operator is != while the non-identity operator is !== to match the equality operator == and the identity operator ===.

2011/04/16
525
4/16/2011 8:27:15 AM

According to this page.

NOTE: The accepted answer works for associative arrays, but it will not work as expected with indexed arrays (explained below). If you want to compare either of them, then use this solution. Also, this function may not works with multidimensional arrays (due to the nature of array_diff function).

Testing two indexed arrays, which elements are in different order, using $a == $b or $a === $b fails, for example:

<?php
    (array("x","y") == array("y","x")) === false;
?>

That is because the above means:

array(0 => "x", 1 => "y") vs. array(0 => "y", 1 => "x").

To solve that issue, use:

<?php
function array_equal($a, $b) {
    return (
         is_array($a) 
         && is_array($b) 
         && count($a) == count($b) 
         && array_diff($a, $b) === array_diff($b, $a)
    );
}
?>

Comparing array sizes was added (suggested by super_ton) as it may improve speed.

2017/08/25

Try serialize. This will check nested subarrays as well.

$foo =serialize($array_foo);
$bar =serialize($array_bar);
if ($foo == $bar) echo "Foo and bar are equal";
2011/07/15

Short solution that works even with arrays which keys are given in different order:

public static function arrays_are_equal($array1, $array2)
{
    array_multisort($array1);
    array_multisort($array2);
    return ( serialize($array1) === serialize($array2) );
}
2019/06/26

Compare them as other values:

if($array_a == $array_b) {
  //they are the same
}

You can read about all array operators here: http://php.net/manual/en/language.operators.array.php Note for example that === also checks that the types and order of the elements in the arrays are the same.

2015/11/12

!=== will not work because it's a syntax error. The correct way is !== (not three "equal to" symbols)

2012/08/30

Source: https://stackoverflow.com/questions/5678959
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