Unable to delete an array element using php array_diff function

Question

I have added few values in Wordpress option table like below:

option_name = optionLists

option_values = Option1, Option2, Option3, Option4

I retrieved those values using PHP like below:

$option_lists = get_option('optionLists');
$myOption = explode("," , $option_lists );

So, here $myOption is an array and if I print $myOption using print_r($myOption), it will show result like below:

Array ( [0] => Option1 [1] => Option2 [2] => Option3 [3] => Option4 )

Now, I want to delete one array element from the above array, say it is Option3. I wrote that like below:

$remvOption = array('4' => 'Option3');
$new_option = array_diff($myOption, $remvOption);

The expected output should be like below:

Array ( [0] => Option1 [1] => Option2 [3] => Option4 )

But, it is still showing:

Array ( [0] => Option1 [1] => Option2 [2] => Option3 [3] => Option4 )

May I know where I am doing the mistake? Thanks in advance.

Works fine for me: codepad.viper-7.com/WNGPE7

billyonecan
– billyonecan

2014-05-21 10:50:33 +00:00
Commented May 21, 2014 at 10:50 — billyonecan
– billyonecan, Commented May 21, 2014 at 10:50

Laurence · Accepted Answer · 2014-05-21 10:47:12Z

0

Your code works for me.

But no need to have the ID of the item - just put the value itself

$myOption = array('Option1', 'Option2', 'Option3', 'Option4');
$remvOption = array('Option3');
$new_option = array_diff($myOption, $remvOption);

And then make sure you are printing the correct variable:

print_r($new_option);

This code gives me output:

 Array ( [0] => Option1 [1] => Option2 [3] => Option4 )

answered May 21, 2014 at 10:47

Laurence

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5 Comments

billyonecan Over a year ago

array_diff() doesn't care about keys, so this doesn't really answer the question

Laurence Over a year ago

@billyonecan - yes, you are correct, but it wont hurt to remove it either.

Md Iftekharul Over a year ago

In $myOption variable the options are coming dynamically. I don't know how many options I have. So, I can't put value manually in array. I just made a string (Option1, Option2, Option3, Option4) value an array using explode function. I am just unable to do it when I am creating array using explode function. Manually it is possible and I know that. Thanks for your help but it is not the answer.

Laurence Over a year ago

I only put that there as a demo to show the code works. You dont need to load 'myOption' first - you can do it in your example. My point is your code works as you have posted it. But you havent shown how you are printing the 'new option' - so my guess is you are doing it wrong somehow.

Md Iftekharul Over a year ago

The mistake was in this code: $myOption = explode(",", $option_lists ); there will be a space after ',' inside the double quotation.

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