I have two arrays, one of product titles and another of quantities. I need to store them in a new array, which has in its first position "title" and "quantity".
This is what I thought:
//arrayTitle and arrayQuantity already come with stored data, both arrays of the same length
$newArray[];
for($i=0;$i<count($arrayTitle);$i++){
$newArray = array("title" => value of the position $i of the title array,
"quantity" => value of the position $i of the quantity array);
}
Try it with an foreach loop, like:
foreach ($arrayTitle as $i => $title) {
$newArray[] = [
'title' => $title,
'quantity' => $arrayQuantity[$i]
];
}
Just map them to callback that returns them in your array format:
$newArray = array_map(function($t, $q) {
return array("title" => $t, "quantity" => $q);
}, $arrayTitle, $arrayQuantity);
Related
I need to check if the keys of an array match an array of keys, and if they don't match then they need to be created. While I managed to create the check I still need to return all keys that don't match in the in_array condition so that they can be added to the original array. How can I achieve this?
My current code:
$new_value = ['id','name','age'];
$keys = ['id','name','age','sex','height','weight'];
foreach($new_value as $new_value){
if(!in_array($new_value, $keys )){
$new_value["{$key}"] = '';
}
}
The desired result would be:
Array pre processing:
'id' => 1,
'name' => 'Ed',
'age' => 15,
Array post processing:
'id' => 1,
'name' => 'Ed',
'age' => 15,
'sex' => '',
'height' => '',
'weight' => '',
So, there are a couple of things here.
// When you are running through your foreach, you don't want to overwrite your
// array variable with the value, which is what is happening. Switch this to `new_values` (plural)
$new_values = ['id','name','age'];
$keys = ['id','name', 'age','sex','height','weight'];
// Since $keys is your desired structure, we want to loop through $key rather than $new_values, and add any missing keys to the $new_values
foreach($keys as $key){
// We want to check if $new_values has all the $keys (you were checking if $keys had all of $new_values, which it does already
if(!in_array($key, $new_values )){
// Since $key is already a string, we don't need to place it in quotes, just put the variable directly into the array as a new array item (because you are using an array of strings, the keys will be numerical)
$new_values[] = $key
}
}
If you are looking for a keyed array, so that you can get the value of $new_values['name'], then you will need to set your arrays up differently and do your checks differently. You can also use $keys to hold a default value.
// Set the keys for your array, instead of having an array of strings that is keyed numerically
$new_values = ['id' => 'user_id','name' => 'user name','age' => 'user age'];
$keys = ['id' => 'default_value','name' => 'default_value', 'age' => 'default_value','sex' => 'default_value','height' => 'default_value','weight' => 'default_value'];
// Here we'll get the key and value of each item in the $keys array
foreach($keys as $key => $default) {
// Check if the array key exists in new values and if not, set it to the predefined default value
if(!array_key_exists($key, $new_values) {
$new_values[$key] = $default;
}
}
EDIT
As per one of the comments on the answer, you could further simplify this with array_merge. If you want to throw an error or do something special on each field, you could use the loop. If you just want to fill in the blanks, it would work like:
// Set the keys for your array, instead of having an array of strings that is keyed numerically
$new_values = ['id' => 'user_id','name' => 'user name','age' => 'user age'];
$keys = ['id' => 'default_value','name' => 'default_value', 'age' => 'default_value','sex' => 'default_value','height' => 'default_value','weight' => 'default_value'];
// If you aren't going to be using the original $new_values array for anything, you can just overwrite it.
// As stated in the comment below, $new_values should be the second value, keys that are in both arrays will be overwritten by what's in the second array.
$new_values = array_merge($keys, $new_values);
// If you will be using the original $new_values array later in the code, you can set the output to a new variable
$filled_values = array_merge($keys, $new_values);
I'm not sure, but you can try next code:
<?php
$data = [
"id" => 1,
"name" => "Ed",
"age" => 15,
];
$keys = ["id", "name", "age", "sex", "height", "weight"];
$result = array_reduce(
$keys,
function ($data, $key) {
if (!isset($data[$key])) $data[$key] = '';
return $data;
},
$data
);
var_export($result);
PHP sandbox here
How to put these codes in a foreach loop?
$item1_details = array(
'id' => 'a1',
'price' => 18000,
'quantity' => 3,
'name' => "Apple"
);
$item2_details = array(
'id' => 'a2',
'price' => 20000,
'quantity' => 2,
'name' => "Orange"
);
Then the array above will be saved in a variable. It's an array. And, yes, I have no idea how to do a loop inside array. So please help me for this too.
$item_details = array ($item1_details, $item2_details);
Thus, I have to questions. First, how to create an array inside a foreach loop. Second, How to loop inside an array.
You don't put a loop inside an array, you push onto the array in a loop.
$item_details = array();
for ($i = 0; $i < 10; $i++) {
$item_details[] = $item1_details;
$item_details[] = $item2_details;
}
This will make an array with 10 alternating copies of $item1_details and $item2_details.
You mentioned a foreach loop, but that's for looping over an array that already exists. You didn't show any array to loop over, so I'm not sure how it applies in this case.
You can use array_values with array_merge
$f = array_merge(array_values($item1_details), array_values($item2_details));
Working example :- https://3v4l.org/fDM3N
I have array, where get_# have random number. Need to foreach all items [result][result][get_#RAND_NUM#] and take [id], [name].
Thanks!
Array:
-[result]
--[result]
---[get_1]
----[id] = "1"
----[name] = "dog"
---[get_6]
----[id] = "53"
----[name] = "cat"
According to PHP manual the foreach makes an iteration over array or object. foreach provides $key and $value options. From this $key var you can get the random number you expect.
The foreach construct provides an easy way to iterate over arrays. foreach works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable.
$data = ['result' => [
'result' => [
'get_1' => ['id' => 1, 'name' => 'doc'],
'get_6' => ['id' => 2, 'name' => 'cat'],
]
]];
$new_data = [];
foreach ($data['result']['result'] as $key => $val) {
// If you want to get the random number uncomment the below line
// $random_no = explode('_', $key)[1]; echo $random_no;
echo "For key {$key}, id = {$val['id']} and name = {$val['name']} </br>";
$new_data[] = ['id' => $val['id'], 'name' => $val['name']];
}
print '<pre>';
print_r($new_data);
Demo
Suppose I have this array,
$cast = [
'jon' => [
'fullname' => 'Jon Snow',
'class' => 'warrior',
],
'margery' => [
'fullname' => 'Margery Tyell',
'class' => 'politician'
]
];
How do I get the key and it's certain value only? like this,
$name = ['jon'=>'Jon Snow', 'margery'=>'Margery Tyrell'];
Is there any function that support this, so It doesn't have to be loop ?
Any answer will be appreciated!
You can iterate through the multidimensional array, and add the key and the value at index fullname of the inner array in a new one-dimensional array like this:
$names = [];
foreach ($cast as $character => $character_details) {
$names[$character] = $character_details['fullname'];
}
EDIT Alternatively, if you don't want to loop through the elements, you could use array_map function which takes a function as an argument where you can specify how to map each element of the array. In your case, you would simply return the fullname of an element.
$names = array_map(
function ($value) {
return $value['fullname'];
},
$cast
);
I guess that you have iterate over it and extract only interesting you keys. Here you have an example:
function getValuesForKey($array, $key){
$result = [];
foreach($array as $k => $subarray){
if(isset($subarray[$key])){
$result[$k] = $subarray[$key];
}
}
return $result;
}
So I have various arrays which do not always have the same key/value pairs in them. What I want to do is to be able to merge the arrays, but to add in empty key/value pairs if they don't already exist in that array, but do in others. It's hard to explain but this might explain it better:
$arrayOne = array('name' => 'rory', 'car' => 'opel');
$arrayTwo = array('name' => 'john', 'dog' => 'albert');
I need to somehow turn this into:
$finalArray = array(
array('name' => 'rory', 'car' => 'opel', 'dog' => ''),
array('name' => 'john', 'car' => '', 'dog' => 'albert')
);
I have been looking through PHP's documentation but can't find anything that will do this for me. Can anyone point me in the right direction? I don't even know an appropriate search term for what I want to achieve here, "array merge" isn't specific enough.
<?php
$arrayOne = array('name' => 'rory', 'car' => 'opel');
$arrayTwo = array('name' => 'john', 'dog' => 'albert');
$diff1=array_diff(array_flip($arrayOne), array_flip($arrayTwo));
$diff2=array_diff(array_flip($arrayTwo), array_flip($arrayOne));
//array_flip flips the key of array with value
//array_diff would return the values in the first array that are not present in any of the other arrays inside
foreach ($diff2 as $s) {
$arrayOne[$s]="";
}
foreach ($diff1 as $s) {
$arrayTwo[$s]="";
};
//set key that didn't exist in that array as ""
$finalArray[]=$arrayOne;
$finalArray[]=$arrayTwo;
//add the arrays to the final array
print_r($finalArray);
Here's what I would do:
Merge your separate arrays into one (into a temporary var) using array_merge
Get the unique keys of this new array using array_keys
For each separate array, loop through the new keys array and add an empty value for each key that is not in the array. Then push the separate array into a final array.
<?php
$arrayOne = array('name' => 'rory', 'car' => 'opel');
$arrayTwo = array('name' => 'john', 'dog' => 'albert');
$new = array_merge($arrayOne,$arrayTwo);
$new = array_keys($new);
$newarray = array();
foreach($new as $value){
$newarray[0][$value] = isset($arrayOne[$value]) ? $arrayOne[$value] : '' ;
$newarray[1][$value] = isset($arrayTwo[$value]) ? $arrayTwo[$value] : '' ;
}
echo "<pre>";print_r($newarray);
You can also use this short answer
$arrayOne = array('name' => 'rory', 'car' => 'opel');
$arrayTwo = array('name' => 'john', 'dog' => 'albert');
$defaults = array('name' => '','car' => '','dog' => '');
$arrayOne += $defaults;
$arrayTwo += $defaults;
$newarray = array($arrayOne,$arrayTwo);
echo "<pre>";print_r($newarray);
Basing on what Justin Powell outlined, I managed to come up with this code before the other two code examples were posted (thank you mamta & user6439245).
I also needed to take the keys containing numbers and sort them appropriately, otherwise my keys would've been indexed like employer_1, education_1, employer_2, education_2.
// get the initial form entries data
$entries = array(
array('name' => 'john', 'car' => 'fiat', 'employer_1' => 'tangerine', 'education_1' => 'hideaways', 'education_2' => 'extras'),
array('name' => 'rory', 'car' => 'opel', 'employer_1' => 'sagittarius', 'employer_2' => 'tangerine', 'employer_3' => 'thehideout', 'education_1' => 'knatchbull')
);
// create an empty array to populate with all field keys
$mergedKeys = array();
// push all field keys into the array
foreach($entries as $entry){
foreach($entry as $key => $value){
array_push($mergedKeys, $key);
}
}
// remove duplicate keys from the array
$uniqueMergedKeys = array_unique($mergedKeys);
// create a new array to populate with the field keys we need to sort - the ones with numbers in
$keysToSort = array();
// push the number-containing keys into the array
$i=0;
foreach($uniqueMergedKeys as $uniqueKey){
if(1 === preg_match('~[0-9]~', $uniqueKey)){
array_push($keysToSort, $uniqueKey);
}
$i++;
}
// remove the number containing keys from the unique keys array
$uniqueMergedKeys = array_diff($uniqueMergedKeys, $keysToSort);
// sort the keys that need sorting
sort($keysToSort);
// put the newly sorted keys back onto the original keys array
foreach($keysToSort as $key){
array_push($uniqueMergedKeys, $key);
}
$final = array();
$i = 0;
foreach($entries as $entry){
foreach($uniqueMergedKeys as $key){
//if($entries[$i][$key]){
if (array_key_exists($key, $entries[$i])) {
$final[$i][$key] = $entries[$i][$key];
} else {
$final[$i][$key] = '';
}
}
$i++;
}
echo '<pre>'; print_r($final); echo '</pre>';