How can I extract only the indexes of the array_diff function?

Question

$array1 = array("a" => "green", "red", "blue", "red", "pink");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
print_r($result);

Instead of it showing: Array ( [1] => blue [3] => pink ) I want it to display only the indexes like this: 1, 3 (maybe inside a new array called $indexesresult) (Reason being that I am comparing an online (mysqli) array with a localhost (mysqli) array and I have to remove whitepaces before I can compare the arrays- I tried hundreds of ways around this but to no avail: array_diff does not like any type of whitespaces). With the indexesresult I can then get the original values back into the arrays to display the differences in a neat tabular format.

Shankar Narayana Damodaran · Accepted Answer · 2014-03-18 09:20:51Z

1

The array_keys would help.

$array1 = array("a" => "green", "red", "blue", "red", "pink");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);
$indexesresult=array_keys($result); //<----- Here
print_r($indexesresult);

OUTPUT :

Array
(
    [0] => 1
    [1] => 3
)

answered Mar 18, 2014 at 9:20

Shankar Narayana Damodaran

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1 Comment

Clark Superman Over a year ago

Part2 for display: foreach($indexesresult as $item) { echo $item."<br>"; } echo "<br><br>"; foreach($indexesresult as $key => $item) { echo "Key ".$key.': '.$array1[$item]." from index: $item <br>"; }

hsz · Accepted Answer · 2014-03-18 09:21:00Z

1

Just try with:

print_r( array_keys($result) );

answered Mar 18, 2014 at 9:21

hsz

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