Is it possible to remove an array from an array? This is how the array looks...
[1042] => Array
(
[contact_name] => XXX
[email] =>
[id] => XXX
)
[1043] => Array
(
[contact_name] => XXX
[email] => XXX
[id] => XXX
)
code...
foreach($contacts as &$contact){
if(empty($contact['email']) || $contact['email'] == '')
unset($contact);
}
It's possible if you use the arrays keys instead of references.
foreach($contacts as $key => $contact){
if(empty($contact['email']))
unset($contacts[$key]);
}
I also removed the $contact['email] == '' since the empty()-check covers empty (!) strings as well.
Note: In general, avoid using references together with foreach if you can. Using them can easily lead to unwanted side effects.
Make use of the key and value pair when defining the foreach loop.
Knowing the key of the value (in this case a subarray) you want to unset, you can do it like below:
foreach($contacts as $key => $contact {
if(empty($contact['email']) || $contact['email'] == '') {
unset($contacts[$key]);
}
}
It looks like you want to filter out items that do not have a value in the email field, if that is the case then use PHP's array_filter method:
$filtered = array_filter($array, function($contact) {
if(!empty($contact['email']) && $contact['email'] != '') {
return $contact;
}
});
Fiddle: Live Demo
had to do traditional for loop and use index to remove. Could not be done with foreach loop.
Edit
// this is the code that worded
for($i = 0; $i <= count($other_array); $i++){
if( !array_key_exists( "testing", $other_array[$i] ) )
unset($other_array[$i]);
}
Related
How can I remove all the replicated values in an array, only keeping the remaining unique key/value? array_unique isn't the solution.
For example, I have the following array.
Array
(
[169580] => 1901
[209662] => 2245
[209682] => 1901
)
I want to compare all values in array and remove both [169580] => 1901 and [209682] => 1901 and keep [209662] => 2245 in the array. The 'key' is an unknown value that I cannot search for.
Final result will look like the following:
Array
(
[209662] => 2245
)
One possibility is to group by values, then create the result by taking the key/value pair from groups that have only one key.
// group
foreach ($array as $key => $value) {
$values[$value][] = $key;
}
// filter
foreach ($values as $value => $keys) {
if (count($keys) == 1) $result[$keys[0]] = $value;
}
An approximate equivalent of this algorithm using array functions (similar to what the other answer shows) rather than loops is like this:
// group
$counts = array_count_values($array);
// filter
$result = array_filter($array, function($value) use ($counts) {
return $counts[$value] == 1;
});
You can use a couple array_ functions to accomplish this: array_count_values() to create a frequency count lookup table and array_filter on the original array to remove keys with count !== 1.
$arr = [
"169580" => 1901,
"209662" => 2245,
"209682" => 1901
];
$lookup = array_count_values($arr);
print_r(array_filter($arr, function ($e) use ($lookup) {
return $lookup[$e] == 1;
}));
Output:
Array
(
[209662] => 2245
)
Try it!
I've tried to display this information tons of times, i've looked all over stackoverflow and just can't find an answer, this isn't a duplicate question, none of the solutions on here work. I've a json array which is stored as a string in a database, when it's taken from the database it's put into an array using json_decode and looks like this
Array
(
[0] => Array
(
[0] => Array
(
)
[1] => Array
(
[CanViewAdminCP] => Array
(
[Type] => System
[Description] => Grants user access to view specific page
[Colour] => blue
)
)
)
)
However, when i try to loop through this, it just returns nothing, I've tried looping using keys, i've tried foreach loops, nothing is returning the values, I'm looking to get the Array key so "CanViewAdminCP" and then the values inside that key such as "Type" and "Description".
Please can anybody help? thankyou.
Use a recursive function to search for the target key CanViewAdminCP recursively, as follows:
function find_value_by_key($haystack, $target_key)
{
$return = false;
foreach ($haystack as $key => $value)
{
if ($key === $target_key) {
return $value;
}
if (is_array($value)) {
$return = find_value_by_key($value, $target_key);
}
}
return $return;
}
Example:
print_r(find_value_by_key($data, 'CanViewAdminCP'));
Array
(
[Type] => System
[Description] => Grants user access to view specific page
[Colour] => blue
)
Visit this link to test it.
You have a 4 level multidimensional array (an array containing an array containing an array containing an array), so you will need four nested loops if you want to iterate over all keys/values.
This will output "System" directly:
<?php echo $myArray[0][1]['CanViewAdminCP']['Type']; ?>
[0] fetches the first entry of the top level array
[1] fetches the second entry of that array
['CanViewAdminCP'] fetches that keyed value of the third level array
['Type'] then fetches that keyed value of the fourth level array
Try this nested loop to understand how nested arrays work:
foreach($myArray as $k1=>$v1){
echo "Key level 1: ".$k1."\n";
foreach($v1 as $k2=>$v2){
echo "Key level 2: ".$k2."\n";
foreach($v2 as $k3=>$v3){
echo "Key level 3: ".$k3."\n";
}
}
}
Please consider following code which will not continue after finding the first occurrence of the key, unlike in Tommassos answer.
<?php
$yourArray =
array(
array(
array(),
array(
'CanViewAdminCP' => array(
'Type' => 'System',
'Description' => 'Grants user access to view specific page',
'Colour' => 'blue'
)
),
array(),
array(),
array()
)
);
$total_cycles = 0;
$count = 0;
$found = 0;
function searchKeyInMultiArray($array, $key) {
global $count, $found, $total_cycles;
$total_cycles++;
$count++;
if( isset($array[$key]) ) {
$found = $count;
return $array[$key];
} else {
foreach($array as $elem) {
if(is_array($elem))
$return = searchKeyInMultiArray($elem, $key);
if(!is_null($return)) break;
}
}
$count--;
return $return;
}
$myDesiredArray = searchKeyInMultiArray($yourArray, 'CanViewAdminCP');
print_r($myDesiredArray);
echo "<br>found in depth ".$found." and traversed ".$total_cycles." arrays";
?>
I am trying to delete an array whereby one of its values..(time) meet a specific condition. \The code I'm currently working with looks like this:
foreach($_SESSION as $key) {
foreach($key['time'] as $keys=>$value){
if(condition){
unset($key);
}
}
}
The array looks like this.
Array
(
[form1] => Array
(
[hash] => lFfKBKiCTG6vOQDa8c7n
[time] => 1401067044
)
[form5] => Array
(
[hash] => TTmLVODDEkI1NrRnAbfB
[time] => 1401063352
)
[form4] => Array
(
[hash] => XCVOvrGbhuqAZehBmwoD
[time] => 1401063352
)
I tried to adapt solutions from these pages but didn't work.
Remove element in multidimensional array and save
PHP - unset in a multidimensional array
PHP How to Unset Member of Multidimensional Array?
If you want to unset the values inside it, a simple single foreach will suffice. Consider this example:
$values = array(
'form1' => array('hash' => 'lFfKBKiCTG6vOQDa8c7n', 'time' => 1401067044),
'form5' => array('hash' => 'TTmLVODDEkI1NrRnAbfB', 'time' => 1401063352),
'form4' => array('hash' => 'XCVOvrGbhuqAZehBmwoD', 'time' => 1401063352),
);
$needle = 1401067044;
foreach($values as $key => &$value) {
if($value['time'] == $needle) {
// if you want to remove this key pair use this
unset($values[$key]['time']);
// if you just want to remove the value inside it
$value['time'] = null;
// if you want to remove all of this entirely
unset($values[$key]);
}
}
Fiddle
Unsetting in a for loop can lead to issues, its easier and better to use array_filter which is optimized for this kind of problem. Here is how to do it with your example. ideone running code
<?php
$ar = Array(
"form1" => Array
(
"hash" => 'lFfKBKiCTG6vOQDa8c7n',
"time" => '1401067044'
),
"form5" => Array
(
"hash" => 'TTmLVODDEkI1NrRnAbfB',
"time" => '1401063352'
),
"form4" => Array
(
"hash" => 'XCVOvrGbhuqAZehBmwoD',
"time" => '1401063352'
)
);
$condition = '1401067044';
$newArray = array_filter($ar, function($form) use ($condition) {
if (!isset($form['time'])) {
return true;
}
return $form['time'] != $condition;
});
var_export($newArray);
array_filter
Assuming your values are stored in $_SESSION
foreach($_SESSION as $key => $value) {
if(isset($value['time']) && $value['time'] < 1401063352) {
unset($_SESSION[$key]);
}
}
If you are storing your values in $_SESSION you may want to consider storing them in a subfield like $_SESSION['myForms'] so if you need to add other values to your session you can easily access only the values you need.
You need to do
unset($_SESSION[$key])
However as mentioned by Victory, array_filter is probably a better approach to this.
How can i add element to my array under a specific key?
This is my array output before i use foreach. As you can see, the error field is empty. I want to fill it out.
Array (
[0] => Array (
[transactionid] => 2223
[created] => 26-02-13 14:07:00
[cardid] => 10102609
[pricebefordiscount] => 68900
[error] =>
)
This is my foreach. As you can see i already tried to make this work by implementing $arrayname['index'] = $value;. But this does not work, nothing comes out when i spit out in a print_r. Why is this happening?
foreach ($samlet as $key)
{
if ($key['pricebefordiscount'] > '200000')
{
$samlet['error'] = "O/2000";
}
if ($key['cardid'] === '88888888')
{
$samlet['error'] = "Testscan";
}
}
This is the desired output:
Array (
[0] => Array (
[transactionid] => 2223
[created] => 26-02-13 14:07:00
[cardid] => 10102609
[pricebefordiscount] => 68900
[error] => "Testscan"
)
Change your foreach, so you have the indexes used in the "main" $samlet array:
foreach($samlet as $key => $array)
{
if ($array['cardid'] === '88888888')
{
$samlet[$key]['error'] = '0/2000';
}
}
And so on...
Try this :
foreach ($samlet as &$key){
if ($key['pricebefordiscount'] > '200000'){
$key['error'] = "O/2000";
}
if ($key['cardid'] === '88888888'){
$key['error'] = "Testscan";
}
}
According to PHP manual:
In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference.
So your code should looke like this:
<?php
foreach ($samlet as &$key)
{
if ($key['pricebefordiscount'] > '200000')
{
$key['error'] = "O/2000";
}
if ($key['cardid'] === '88888888')
{
$key['error'] = "Testscan";
}
}
TRY THIS
foreach ($samlet as $key=>$value)
{
if ($value['pricebefordiscount'] > '200000')
{
$samlet[$key]['error'] = "O/2000";
}
if ($value['cardid'] === '88888888')
{
$samlet[$key]['error'] = "Testscan";
}
}
This question already has answers here:
How do you remove an array element in a foreach loop?
(6 answers)
Closed 6 years ago.
I have a foreach loop set up to go through my array, check for a certain link, and if it finds it removes that link from the array.
My code:
foreach($images as $image)
{
if($image == 'http://i27.tinypic.com/29yk345.gif' ||
$image == 'http://img3.abload.de/img/10nx2340fhco.gif' ||
$image == 'http://i42.tinypic.com/9pp2456x.gif')
{
unset($images[$image]);
}
}
But it doesn't remove the array entires. It's probably something to do with $images[$image], as that's not the key of the array entry, only the content? Is there a way to do this without incorporating a counter?
Thanks.
EDIT: Thanks guys, but now I have another problem where the array entries don't actually get deleted.
My new code:
foreach($images[1] as $key => $image)
{
if($image == 'http://i27.tinypic.com/29yk345.gif')
$image == 'http://img3.abload.de/img/10nx2340fhco.gif' ||
$image == 'http://i42.tinypic.com/9pp2456x.gif')
{
unset($images[$key]);
}
}
$images is actuallty a two-dimensional array now hence why I need $images[1]. I have checked and it successfully goes around the array elements, and some elements do actually have some of those URLs in that I wish to delete, but they're not getting deleted. This is my $images array:
Array
(
[0] => Array
(
[0] => useless
[1] => useless
[2] => useless
[3] => useless
[4] => useless
)
[1] => Array
(
[0] => http://i27.tinypic.com/29yk345.gif
[1] => http://img3.abload.de/img/10nx2340fhco.gif
[2] => http://img3.abload.de/img/10nx2340fhco.gif
[3] => http://i42.tinypic.com/9pp2456x.gif
)
)
Thanks!
foreach($images as $key => $image)
{
if(in_array($image, array(
'http://i27.tinypic.com/29ykt1f.gif',
'http://img3.abload.de/img/10nxjl0fhco.gif',
'http://i42.tinypic.com/9pp2tx.gif',
))
{
unset($images[$key]);
}
}
Try that:
foreach ($images[1] as $key => &$image) {
if (yourConditionGoesHere) {
unset($images[1][$key])
}
}
unset($image); // detach reference after loop
Normally, foreach operates on a copy of your array so any changes you make, are made to that copy and don't affect the actual array.
So you need to unset the values via $images[$key];
The reference on &$image prevents the loop from creating a copy of the array which would waste memory.
To answer the initial question (after your edit), you need to unset($images[1][$key]);
Now some more infos how PHP works:
You can safely unset elements of the array in foreach loop, and it doesn't matter if you have & or not for the array item. See this code:
$a=[1,2,3,4,5];
foreach($a as $key=>$val)
{
if ($key==3) unset($a[$key]);
}
print_r($a);
This prints:
Array
(
[0] => 1
[1] => 2
[2] => 3
[4] => 5
)
So as you can see, if you unset correct thing within the foreach loop, everything works fine.
You can use the index of the array element to remove it from the array, the next time you use the $list variable, you will see that the array is changed.
Try something like this
foreach($list as $itemIndex => &$item) {
if($item['status'] === false) {
unset($list[$itemIndex]);
}
}
$image is in your case the value of the item and not the key. Use the following syntax to get the key too:
foreach ($images as $key => $value) {
/* … */
}
Now you can delete the item with unset($images[$key]).
One solution would be to use the key of your items to remove them -- you can both the keys and the values, when looping using foreach.
For instance :
$arr = array(
'a' => 123,
'b' => 456,
'c' => 789,
);
foreach ($arr as $key => $item) {
if ($item == 456) {
unset($arr[$key]);
}
}
var_dump($arr);
Will give you this array, in the end :
array
'a' => int 123
'c' => int 789
Which means that, in your case, something like this should do the trick :
foreach($images as $key => $image)
{
if($image == 'http://i27.tinypic.com/29yk345.gif' ||
$image == 'http://img3.abload.de/img/10nx2340fhco.gif' ||
$image == 'http://i42.tinypic.com/9pp2456x.gif')
{
unset($images[$key]);
}
}
foreach($images as $key=>$image)
{
if($image == 'http://i27.tinypic.com/29ykt1f.gif' ||
$image == 'http://img3.abload.de/img/10nxjl0fhco.gif' ||
$image == 'http://i42.tinypic.com/9pp2tx.gif')
{ unset($images[$key]); }
}
!!foreach($images as $key=>$image
cause $image is the value, so $images[$image] make no sense.
You would also need a
$i--;
after each unset to not skip an element/
Because when you unset $item[45], the next element in the for-loop should be $item[45] - which was [46] before unsetting. If you would not do this, you'd always skip an element after unsetting.
Sorry for the late response, I recently had the same problem with PHP and found out that when working with arrays that do not use $key => $value structure, when using the foreach loop you actual copy the value of the position on the loop variable, in this case $image. Try using this code and it will fix your problem.
for ($i=0; $i < count($images[1]); $i++)
{
if($images[1][$i] == 'http://i27.tinypic.com/29yk345.gif' ||
$images[1][$i] == 'http://img3.abload.de/img/10nx2340fhco.gif' ||
$images[1][$i] == 'http://i42.tinypic.com/9pp2456x.gif')
{
unset($images[1][$i]);
}
}
var_dump($images);die();