remove element from array php

Question

My first array is like:

Array ( [0] => Array ( [column_name] => ben_firstname ) )

Second array:

Array ( [0] => Array ( [column_name] => ben_unique_id )
        [1] => Array ( [column_name] => ben_firstname )
        [2] => Array ( [column_name] => ben_lastname )
        [3] => Array ( [column_name] => ben_middlename ) )

I want to remove ben_firstname (which is in first array) from second array...

I tried with array_diff function. But, I am getting error.

CODE:

print_r(array_diff($first_array, $second_array));

ERROR:

 Message: Array to string conversion

Thanks for your help.

"I tried with array_diff function." - Show your approach. "But, I am getting error." - What error? Post the output. — dialogik
– dialogik, Commented Jun 3, 2014 at 21:47

Jon · Accepted Answer · 2014-06-03 21:51:03Z

5

You can't use array_diff directly because that function expects array elements to be scalar, while in your case they are themselves arrays.

The correct solution is to use array_udiff with a callback that determines equality by looking at the column_name key of each array:

$result = array_udiff(
     $second,
     $first, 
     function($x, $y) { return strcmp($x['column_name'], $y['column_name']); }
);

See it in action.

answered Jun 3, 2014 at 21:51

Jon

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Comments

djbhindi · Accepted Answer · 2014-06-03 21:48:32Z

0

You need to do:

$newArray = array_diff($array2, $array1);

The order is important. What error are you getting?

EDIT: Your error is that you're trying to print an array, not that the array_diff didn't work.

If you want to print a PHP array, print_r should work. What PHP version are you on?

answered Jun 3, 2014 at 21:48

djbhindi

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