The dump of the following array is:
$quest_all = $qwinners->pluck('id', 'qcounter')->toArray();
array(2) { [60]=> int(116) [50]=> int(117) }
As shown above, the key is 60 and 50 (which is qcounter), while the value is 116 and 117 (which is id).
I'm trying to assign the qcounter to a variable as follows, but with a fixed index, such as 0,1,2,3 .. etc :
$qcounter1= $quest_all[0];
$qcounter2= $quest_all[1];
And the same with id :
$id1= $quest_all[0];
$id2= $quest_all[1];
Any help is appreciated.
Try as below:
One way is:
array_values($quest_all); will give you an array of all Ids
array_keys($quest_all); will give an array of all qcounters and respective indexes for qcounter and ids will be the same.
Other way, First get all qcounters only from collection:
$quest_all = $qwinners->pluck('qcounter')->toArray();
$qcounter1= $quest_all[0];
$qcounter2= $quest_all[1];
...
and so on
Then get all ids
$quest_all = $qwinners->pluck('id')->toArray();
$id1= $quest_all[0];
$id2= $quest_all[1];
...
and so on
You can also use foreach to iterate through the result array.
To reset array keys, use array_values().
To get array keys, use array_keys():
$quest_all = $qwinners->pluck('id', 'qcounter')->toArray();
$quest_all_keys = array_keys($quest_all);
$quest_all_values = array_values($quest_all);
Or simply use foreach():
$keys = [];
$values = [];
foreach($quest_all as $key => $value){
$keys[] = $key;
$values[] = $value;
}
I am not sure why you want variable names incrementing when you could have an array instead but if you don't mind an underscore, '_' in the name and them starting at 0 index you can use extract to create these variables. (As an exercise)
$quest_all = ...;
$count = extract(array_keys($quest_all), EXTRA_PREFIX_ALL, 'qcounter');
extract(array_values($quest_all), EXTRA_PREFIX_ALL, 'id');
// $qcounter_0 $qcounter_1
// $id_0 $id_1
for ($i = 0; $i < $count; $i++) {
echo ${'qcounter_'. $i} .' is '. ${'id_'. $i} ."\n";
}
It would probably be easier to just have the 2 arrays:
$keys = array_keys($quest_all);
$values = array_values($quest_all);
Related
I have 2 SELECT statement in my PHP. Both the select statements fetch data from two different DB. The fetched data is saved in PDO Assoc Array. The problem is when I want to compare those two arrays to find that if the column 'id' exist in both arrays or not. If it exists then ignore it. If it's a unique id then save it into a third array. But I found some problems in my Logic Below
And after running the below code I am getting a couple of error:
1: Array to string conversion
2: duplicate key value violates unique constraint
$arr1 = $msql->fetchAll(PDO::FETCH_ASSOC);
$array1 = array();
foreach($arr1 as $x){
$array1[] = $x['id'];
}
$arr2 = $psql->fetechAll(PDO::FETCH_ASSOC);
$array2 = array();
foreach($arr2 as $y){
$array2[] = $y['id'];
}
$finalarray = array();
for ($i = 0; $i < count($arr1); $i++){
if(count(array_intersect($array1,$array2)) <= 1){// is the count of id is 1 or less save that whole row in the $finalarray
$finalarray = $arr1[$i]; // saving the unique row.
}
else{
continue;
}
}
All I am trying to get the unique row of data array() after comparing their id column.
You can use in_array() function as both arrays are index array.
$finalarray = array();
for ($i = 0; $i < count($arr1); $i++){
if(count(array_intersect($array1,$array2)) <= 1){// is the count of id is 1 or less save that whole row in the $finalarray
$finalarray = $arr1[$i]; // saving the unique row.
}
else{
continue;
}
}
make change in code:
$finalarray = array();
for ($i = 0; $i < count($arr1); $i++){
if(!in_array($array1[$i], $array2)){
$finalarray[] = $array1[$i]; // saving the unique row.
}
}
You can simply use array_intersect() to get common values between two array. for difference, can use array_diff()
$array1 = [1,2,3,4,5,6,7];
$array2 = [2,4,6];
//array_intersect — Computes the intersection of arrays
$result = array_intersect($array1, $array2);
print_r($result);
//array_diff — Computes the difference of arrays
$result = array_diff($array1, $array2);
print_r($result);
DEMO
Rather than using 3 different arrays to get unique ids, you can do it by using one array. Make changes to your code as below:
$finalarray = array();
$arr1 = $msql->fetchAll(PDO::FETCH_ASSOC);
foreach($arr1 as $x){
if (!in_array($x['id'],$finalarray)) { // check id is already stored or not
$finalarray[] = $x['id'];
}
}
$arr2 = $psql->fetechAll(PDO::FETCH_ASSOC);
foreach($arr2 as $y){
if (!in_array($y['id'],$finalarray)) { // check id is already stored or not
$finalarray[] = $y['id'];
}
}
Maybe you should make sure which array is larger before your loop ;
Or using array_diff:
$finalarray = array_diff($array1 , $array2) ?? [];
$finalarray = array_merge( array_diff($array2 , $array1) ?? [], $finalarray );
I have 4 arrays, each one holds another column of a table, I would like to create one array with the data ordered per array[$i]. All arrays have the same number of values: $namesArr, $folderArr, $updatedAt, $valuesArr .
I would like my new array to be contain:
$namesArr[0], $folderArr[0], $updatedAt[0], $valuesArr[0],
$namesArr[1], $folderArr[1], $updatedAt[1], $valuesArr[1],
$namesArr[2], $folderArr[2], $updatedAt[2], $valuesArr[2],
...
I guess the solution is pretty simple, but I got stuck :(
Can anyone help?
I would do something like:
$arr = array_map(function () { return func_get_args(); },$namesArr, $folderArr, $updatedAt, $valuesArr);
You can use foreach loop to merge 4 arrays:
foreach ($namesArr as $key => $value) {
$arr[$key][] = $value;
$arr[$key][] = $folderArr[$key];
$arr[$key][] = $updatedAt[$key];
$arr[$key][] = $valuesArr[$key];
}
Thus $arr will be the merged array
<?php
$newArr = array();
for ($i = 0; $i < count($namesArr); $i++)
{
$newArr[$i][0] = $namesArr[$i];
$newArr[$i][1] = $folderArr[$i];
$newArr[$i][2] = $updatedAt[$i];
$newArr[$i][3] = $valuesArr[$i];
}
?>
Explanation
What this will do is iterate depending on how many elements there are in $namesArr.
I utilised a multidimensional array here so that the first set of square brackets is effectively the "row" in a table, and the second set of square brackets are the "column" of a table.
do the following way:
while($db->query($sql)){
$namesArr[] =$db->f('names');
$folderArr[]=$db->f('folder');
$updatedAt[]=$db->f('updated');
$valuesArr[]=$db->f('values');
}
Is there any way to get the key range of same values and make a new array?
Let's say we have an Array Like this in php :
$first_array = ['1'=>'a','2'=>'a','3'=>'a','4'=>'b','5'=>'b','6'=>'a','7'=>'a'];
How can i get this array? Is there any function for this?
$second_array = ['1-3'=>'a','4-5'=>'b','6-7'=>'a'];
Loop through it, extract the keys, generate the ranges and insert to the new array -
$first_array = ['1'=>'a','2'=>'a','3'=>'a','4'=>'b','5'=>'b'];
$flip = array();
foreach($first_array as $key => $val) {
$flip[$val][] = $key;
}
$second_array = [];
foreach($flip as $key => $value) {
$newKey = array_shift($value).' - '.end($value);
$second_array[$newKey] = $key;
}
Output
array(2) {
["1 - 3"]=>
string(1) "a"
["4 - 5"]=>
string(1) "b"
}
regarding your first question you can get range of each value using foreach() loop.
$first_array = ['1'=>'a','2'=>'a','3'=>'a','4'=>'b','5'=>'b'];
foreach($first_array as $key=>$value)
{
//do your coding here, $key is the index of the array and $value is the value at that range, you can use that index and value to perform array manipulations
}
Regarding your second question it not exactly clear what are trying to implement there. But what ever you want to do like creating a new array with modified index and other things can be done within this foreach() loop itself
I hope this helps you.
If someone is still looking for an answer, here is what I did.
Given the array
$first_array = ['0'=>'a',
'1'=>'a',
'2'=>'a',
'3'=>'a',
'4'=>'a',
'5'=>'b',
'6'=>'b',
'7'=>'a',
'8'=>'a']
I build a multidimensional array, in which each element is an array of three more elements:
[0] - The value in the first array
[1] - The key where the value starts repeating
[2] - The last key where the value stops repeating
The code
$arrayRange = [];
for($i = 0; $i < count($first_array); $i++){
if(count($arrayRange) == 0){
// The multidimensional array is still empty
$arrayRange[0] = array($first_array[$i], $i, $i);
}else{
if($first_array[$i] == $arrayRange[count($arrayRange)-1][0]){
// It's still the same value, I update the value of the last key
$arrayRange[count($arrayRange)-1][2] = $i;
}else{
// It's a new value, I insert a new array
$arrayRange[count($arrayRange)] = array($first_array[$i], $i, $i);
}
}
}
This way you get a multidimensional array like this:
$arrayRange[0] = array['a', 0, 4];
$arrayRange[1] = array['b', 5, 6];
$arrayRange[2] = array['a', 7, 8];
I have an associative array, $teams_name_points. The length of the array is unknown.
How do I access the first and forth value without knowing the key of this array in the easiest way?
The array is filled like this:
$name1 = "some_name1";
$name2 = "some_name2";
$teams_name_points[$name1] = 1;
$teams_name_points[$name2] = 2;
etc.
I want to do something like I do with an indexed array:
for($x=0; $x<count($teams_name_points); $x++){
echo $teams_name_points[$x];
}
How do I do this?
use array_keys?
$keys = array_keys($your_array);
echo $your_array[$keys[0]]; // 1st key
echo $your_array[$keys[3]]; // 4th key
You can use array_values which will give you a numerically indexed array.
$val = array_values($arr);
$first = $val[0];
$fourth = $val[3]
In addition to the array_values, to loop through as you show:
foreach($teams_name_points as $key => $value) {
echo "$key = $value";
}
You can get use the array_keys function such as
//Get all array keys in array
$keys = array_keys($teams_name_points);
//Now get the value for 4th key
//4 = (4-1) --> 3
$value = $teams_name_points[$keys[3]];
You can get all values now as exists
$cnt = count($keys);
if($cnt>0)
{
for($i=0;$i<$cnt;$i++)
{
//Get the value
$value = $team_name_points[$keys[$i]];
}
}
What is the best way to check if an multi-dimension array contains 2 or more equal value and only return the first one .
ex : i have an array of people that contain
[0][firstName] = 'John';
[0][lastName] = 'Doe';
[N][firstName] = 'Marco';
[N][lastName] = 'Polo';
[120][firstName] = 'John';
[120][lastName] = 'Doe';
Should detect that the index 120 is a duplicate and remove it .
I'm looking for the best performance , i don't want to loop on the array and check every time if i have the value or not .
Is there something faster ?
It is the element distinctness problem which is basically O(NlogN) via sorting and iterating (after sorting, duplicates will be adjacent to each other - so easy to detect them)
However, it can be done also in O(N) on average and with O(N) additional space by storing all elements to a hash table while iterating, and breaking if an element already exists.
You might also want to store the original index of each element if you will later need it (and don't use the index as key).
pseudo code:
map <- empty hash map
for each element e with idx i in list (in ascending order of i):
if (map.contains(e)):
e is a dupe, the first element is in index map.get(e)
else:
map.add(e,i)
You can try
// Generate Possible name with duplicate
$names = array("John","Doe","Polo","Marco","Smith");
$array = array();
for($i = 0; $i < 20; $i ++) {
$key = mt_rand(0, 1000);
$array[$key]["firstName"] = $names[array_rand($names)];
$array[$key]["lastName"] = $names[array_rand($names)];
}
// Start Sorting process
ksort($array);
// Start Storage
$data = $hash = array();
// Loop and porpulate new array
foreach ( $array as $k => $v ) {
$h = sha1($v['firstName'] . $v["lastName"]);
isset($hash[$h]) or $data[$k] = $v and $hash[$h] = 1;
}
var_dump($data);