Removing certain array element in a for-loop in PHP

Question

I have inserted some elements (fruit names) queried from mySQL into an array. Now, I would like to remove certain items from the array. I want to remove 'Apple' and 'Orange' if the exist from the array. This is what I tried but I am getting an error message.

Array Example:
Array ( [1] => Orange [2] => Apple)

foreach($terms as $k => $v) 
{
    if (key($v) == "Apple") 
    {
        unset($terms[$k]);
    }
    elseif( key($v) == "Orange")
    {
        unset($terms[$k]);
    }

}


>>> Warning: key() expects parameter 1 to be array, string given //same error repeated 4 times

I referred to this link here: How do you remove an array element in a foreach loop? I would be grateful if anyone can point out what I did wrong.

key() doesn't work like that. If you're just trying to access the keys of the array, just make use of $k provided by your foreach construct. In this case, your array is not associative, so your keys are numeric and therefore it won't work. Solution would be to either change your array to be associative (eg: $arr = ['foo' => 'hello', 'bar' => 'howdy'];), or change the comparison like so: if ($v == 'SomeValue') { /* do stuff */ }. — Amal
– Amal, Commented Apr 22, 2014 at 6:28
@AmalMurali Thanks for the explanation. I just started php not long ago and still learning from examples. — Cryssie
– Cryssie, Commented Apr 22, 2014 at 6:30

Abed Hawa · Accepted Answer · 2014-04-22 06:20:23Z

5

Have you tried it this way:

foreach($terms as $k => $v) 
{ 
    if ($v == "Apple") 
    {
        unset($terms[$k]);
    }
    elseif($v == "Orange")
    {
        unset($terms[$k]);
    }

}

answered Apr 22, 2014 at 6:20

Abed Hawa

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1 Comment

Pogrindis Over a year ago

While the selected answer is more structurally sound this is a good answer for highlighting the actual current value in the foreach loop ($v)

Shankar Narayana Damodaran · Accepted Answer · 2014-04-22 06:48:34Z

1

Explanation:

The $fr is your actual array of all fruits.. and your $rm is another array that contains list of items to be removed from your $fr array.

Using a foreach cycle through the $rm array and see if the element exists on the $fr array , if found, unset() it.

The code...

<?php
$fr = array('Apple','Orange','Pineapple'); //<-- Your actual array
$rm = array('Apple','Orange'); //<--- Elements to be removed 

foreach($rm as $v)
{
    if(in_array($v,$fr))
    {
        unset($fr[array_search($v,$fr)]);
    }
}
print_r($fr);

OUTPUT :

Array
(
    [2] => Pineapple
)

Using `array_diff()`

print_r(array_diff($fr,$rm));

Code Demonstration

edited Apr 22, 2014 at 6:48

answered Apr 22, 2014 at 6:20

Shankar Narayana Damodaran

68.6k43 gold badges102 silver badges129 bronze badges

5 Comments

Amal Over a year ago

Or you could just use array_diff($fr, $rm).

Shankar Narayana Damodaran Over a year ago

@AmalMurali, Exactly.

Cryssie Over a year ago

@ShankarDamodaran Thanks! It's great to know I can do that and yes that would help. I just started php 2 days ago and still have lots to learns.

Shankar Narayana Damodaran Over a year ago

@Cryssie, We are glad to help you :)

Shankar Narayana Damodaran Over a year ago

@Cryssie, Instead of checking for each and every time , better store them in an array and utilize the available powerful array functions and you could also lessen your code using the same.

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