Unsetting Array Values in a Foreach Loop

How do you remove an array element in a foreach loop?

If you also get the key, you can delete that item like this:

foreach ($display_related_tags as $key => $tag_name) {
    if($tag_name == $found_tag['name']) {
        unset($display_related_tags[$key]);
    }
}

Unset array element inside a foreach loop

foreach($arr as $k => $v) {
    if(key($v) > 5) {
        unset($arr[$k]);
    }
}

Why do I need unset $value after foreach loop

There's no need to use unset in the current context that you are using it. unset will simply destroy the variable and its content.

In the example you are giving, this is looping through an array creating $value, then you are unsetting that variable. Which means it no longer exists in that code. So that does absolutely nothing.

To visuallize what I am talking about look at this example:

$value = 'Hello World';
echo $value;
unset($value);
echo $value;

The following out will be:

Hello World<br /><b>NOTICE</b> Undefined variable: value on line number 6<br />

So you will first see the Hello World, but after unsetting that variable trying to call it will just cause an error.

To answer your question, you really don't have to unset value; there's no need for it. As the foreach loop is setting a $value of each array() + 10.

Unsetting it will cause the work to be removed, and forgotten.

PHP - Unsetting array element in a foreach loop

You need to use the key from your foreach, and unset the variable directly (from the session):

foreach ($_SESSION['cart']  as $key => $arrays3) {
    if($arrays3['id'] == $id){
        unset($_SESSION['cart'][$key]);
    }
}

Unsetting $arrays3 or any of its children will only be effective until the next iteration of the foreach loop, when it will be set again.

PHP removing elements from array in a foreach loop

If you only use one parameter on a foreach loop you are delivered the value of the occurance and not the key for the occurance.

Try this so that you are getting a key from the foreach loop and not a value

foreach($removeKeys as $key => $val) {
   unset($orders_list[$key]);
   echo $key;
}

php unset foreach loop is not unsetting the value of array

This is a workaround for your current code:

$tempArr = [];
foreach ($data->certificates as $k => $certificate) {
    if (!empty($certificate['testCertificateId'])) {
        $tempArr[$k] = $data->certificates[$k];
    }
}
$data->certificates = $tempArr;

Unset an array element inside a foreach loop

You're unsetting the reference (breaking the reference). You'd need to unset based on a key:

foreach ($this->result['list'] as $key => &$row) {
    if ($this_row_is_boring) {
        unset($this->result['list'][$key]);
    }
}

Deleting an item in a foreach loop in PHP

Simple Solution, unset the element by it's index:

foreach ($array as $key => $element) {
    if (conditions) {
        unset($array[$key]);
    }
}

Just unsetting $element will not work, because this variable is not a reference to the arrays element, but a copy. Accordingly changing the value of $element will not change the array too.

How to remove element from array in forEach loop?

It looks like you are trying to do this?

Iterate and mutate an array using Array.prototype.splice

var pre = document.getElementById('out');

function log(result) {
  pre.appendChild(document.createTextNode(result + '\n'));
}

var review = ['a', 'b', 'c', 'b', 'a'];

review.forEach(function(item, index, object) {
  if (item === 'a') {
    object.splice(index, 1);
  }
});

log(review);

<pre id="out"></pre>

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