PHP: Finding differences in two multidimensional arrays

Question

1.44/5 (2 votes)

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first array

VB

Array
(
    [0] => Array
        (
            [file] => newhotfolder.gif
            [path] => images/newhotfolder.gif
            [type] => gif
            [size] => 1074
            [md5] => 123812asdkbqw98eqw80hasdas234234
        )

    [1] => Array
        (
            [file] => image.gif
            [path] => images/attachtypes/image.gif
            [type] => gif
            [size] => 625
            [md5] => 7bbb66e191688a86b6f42a03bd412a6b
        )

    [2] => Array
        (
            [file] => header.gif
            [path] => images/attachtypes/header.gif
            [type] => gif
            [size] => 625
            [md5] => 71291239asskf9320234kasjd8239393
        )
)

second array

VB

Array
(
    [0] => Array
        (
            [file] => newhotfolder.gif
            [path] => images/newhotfolder.gif
            [type] => gif
            [size] => 1074
            [md5] => 8375h5910423aadbef67189c6b687ff51c
        )

    [1] => Array
        (
            [file] => image.gif
            [path] => images/attachtypes/image.gif
            [type] => gif
            [size] => 625
            [md5] => 7bbb66e191688a86b6f42a03bd412a6b
        )

    [2] => Array
        (
            [file] => footer.gif
            [path] => images/attachtypes/footer.gif
            [type] => gif
            [size] => 625
            [md5] => 1223819asndnasdn2213123nasd921
        )
)

Posted 1-Jun-14 5:02am

TheSniper105

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Comments

DamithSL 1-Jun-14 11:09am

check http://stackoverflow.com/questions/12649648/php-comparing-two-dimensional-arrays[^]

Sergey Alexandrovich Kryukov 1-Jun-14 13:37pm

Would you define what does it mean "find differences"? It will be not so trivial as you may think...
—SA

Member 10014068 29-Nov-16 18:22pm

this one is quite good, but ...
it have big problem with comparing values retrieved by post submission against array with values retrieved from database. The biggest issue are 0 (zeros) submitted by form. PHP treats them as empty while those retrieved from database have value 0. any trick for it?

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Peter Leow · Accepted Answer · 2014-06-01T05:59:00

These are multi-dimensional associative arrays, you can recursively do an array_diff_assoc, find out here: array-diff-assoc-php[^]
See example:

<?php
/*
[NOTE BY danbrown AT php DOT net: The array_diff_assoc_recursive function is a 
combination of efforts from previous notes deleted.
Contributors included (Michael Johnson), (jochem AT iamjochem DAWT com), 
(sc1n AT yahoo DOT com), and (anders DOT carlsson AT mds DOT mdh DOT se).]
*/
function array_diff_assoc_recursive($array1, $array2)
{
	foreach($array1 as $key => $value)
	{
		if(is_array($value))
		{
			if(!isset($array2[$key]))
			{
				$difference[$key] = $value;
			}
			elseif(!is_array($array2[$key]))
			{
				$difference[$key] = $value;
			}
			else
			{
				$new_diff = array_diff_assoc_recursive($value, $array2[$key]);
				if($new_diff != FALSE)
				{
					$difference[$key] = $new_diff;
				}
			}
		}
		elseif(!isset($array2[$key]) || $array2[$key] != $value)
		{
			$difference[$key] = $value;
		}
	}
	return !isset($difference) ? 0 : $difference;
}

$a1=Array
(
    "0" => Array
        (
            "file" => "newhotfolder.gif",
            "path" => "images/newhotfolder.gif",
            "type" => "gif",
            "size" => "1074",
            "md5" => "123812asdkbqw98eqw80hasdas234234"
        ),
 
    "1" => Array
        (
            "file" => "image.gif",
            "path" => "images/attachtypes/image.gif",
            "type" => "gif",
            "size" => "625",
            "[md5]" => "7bbb66e191688a86b6f42a03bd412a6b"
        ),
 
    "2" => Array
        (
            "file" => "header.gif",
            "path" => "images/attachtypes/header.gif",
            "type" => "gif",
            "size" => "625",
            "md5" => "71291239asskf9320234kasjd8239393"
        )
);
$a2=Array
(
    "0" => Array
        (
            "file" => "newhotfolder.gif",
            "path" => "images/newhotfolder.gif",
            "type" => "gif",
            "size" => "1074",
            "md5" => "8375h5910423aadbef67189c6b687ff51c"
        ),
 
    "1" => Array
        (
            "file" => "image.gif",
            "path" => "images/attachtypes/image.gif",
            "type" => "gif",
            "size" => "625",
            "[md5]" => "7bbb66e191688a86b6f42a03bd412a6b"
        ),
 
    "2" => Array
        (
            "file" => "header.gif",
            "path" => "images/attachtypes/footer.gif",
            "type" => "gif",
            "size" => "625",
            "md5" => "1223819asndnasdn2213123nasd921"
        )
);

print_r(array_diff_assoc_recursive($a1, $a2));

?>