I don't want to use array_merge() as it results in i misunderstood that all values with the same keys would be overwritten. i have two arrays
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
and would like to combine them resulting like this
array(0=>'foo', 1=>'bar',2=>'bar', 3=>'foo');
array_merge() appends the values of the second array to the first. It does not overwrite keys.
Your example, results in:
Array (
[0] => foo
[1] => bar
[2] => bar
[3] => foo )
However, If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
Unless this was just an example to another problem you were having?
Does this answer your question? I'm not sure exactly what you're trying to accomplish, but from your description it sounds like this will work:
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
foreach ($array2 as $i) {
$array1[] = $i;
}
echo var_dump($array1);
If someone stumbles upon this, this is a way to do it nowadays:
var_dump(array_merge_recursive($array1, $array2));
There are probably much better ways but what about:
$newarray= array();
$array1 = array(0=>'foo', 1=>'bar');
$array2 = array(0=>'bar', 1=>'foo');
$dataarrays = array($array1, $array2);
foreach($dataarrays as $dataarray) {
foreach($dataarray as $data) {
$newarray[] = $data;
}
}
print_r($newarray);
$result = array_keys(array_merge(array_flip($array1), array_flip($array2)));
var_dump($result);
Related
How to change key array php from
array(
[0]=>Joni
[1]=>Jono
[2]=>Riki
[3]=>Budi
);
Change index to:
array(
[nominal]=>Joni
[nominal]=>Jono
[nominal]=>Riki
[nominal]=>Budi
);
you can make a multi-dimensional array for this purpose
$arr = array('a','b','c','d');
for($i=0;$i<count($arr);$i++){
$newArr['nominal'][$i] = $arr[$i];
}
print_r($newArr);
The expected outcome you want is not possible at all, because same indexes will be over-written in single-dimensional array.
Check this to understand what i said above:- https://eval.in/954556
Now there are 2 closer possiblities of outcomes, which i am going to mention:-
$possibility1 = [];
$possibility2 =[];
foreach($array as $arr){
$possibility1[] = ['nominal'=>$arr];
$possibility2['nominal'][] = $arr;
}
print_r($possibility1);//first closer possibility
print_r($possibility2);//second closer possibility
Output:- https://eval.in/954559
I have a 2D array like
attendee_programs = [1 =>[100,101],
2 =>[100,101,102]
];
I want to get array_values() and array_unique() but only for the nested elements (sorry, not sure what the terminology is) ...I.E.
programs = [100,101,102];
Is there a php function for this? or do I need to loop through and assemble it manually?
Edit: All of the answers are very helpful and have shown me something new. Sorry I can only accept one.
You could use a clever combination of array_unique, array_reduce and array_merge to achieve this:
$a = array_unique(array_reduce($attendee_programs, 'array_merge', []));
Doing this might be end in an array with some gaps in the indizes - if you need gaples array keys, you have to add array_values at the end
$a = array_values($a);
You can use:
call_user_func_array('array_merge', array_values($attendee_programs));
to get values of nested array.
array_unique(call_user_func_array('array_merge', array_values($attendee_programs)));
to get unique values.
RecursiveIteratorIterator
RecursiveArrayIterator
Solution:
function flatten($array)
{
$rit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
return iterator_to_array($rit, true);
}
echo '<pre>';
print_r(flatten($attendee_programs));
Result:
Array
(
[0] => 100
[1] => 101
[2] => 102
)
Yet another option:
$flat = array();
array_walk_recursive($attendee_programs, function($value) use (&$flat) {
$flat[] = $value;
});
$flat = array_unique($flat);
I am wondering how can I store all values from a foreach loop, I know that I am re-initialising in the loop but I'm not sure how to store the data. Heres my basic loop:
$array = array("v1", "v2", "v3", "v4");
foreach($array as $row){
$arr = array('val' => $row);
echo $row;
}
print_r($arr);
So when I use the print_r($arr) the only thing outputted would be v4 and I know that the values are there because the echo $row; does return each output individually.
My question would be how can I store each instance of row in my array?
Create a new array, fill it:
$array = array("v1", "v2", "v3", "v4");
$newArray = array();
foreach($array as $row){
// notice the brackets
$newArray[] = array('val' => $row);
}
print_r($newArray);
It looks like you are storing your array wrong.
Try adjusting the $arr = array('val' => $row);
to:
$arr[] = array('val' => $row);
This will set it so you pick up each line as a separate array which you can easily navigate through.
Hope this helps!
If I'm reading correctly, you want to transform your array from simple values to key-value pairs of 'val'->number. array_map is a concise way of doing this sort of transformation.
$array = array("v1", "v2", "v3", "v4");
$arr = array_map(function($v) { return array('val'=>$v); }, $array);
print_r($arr);
While it doesn't matter in this case, array_map also has the handy feature of preserving your keys, in case that is desired.
Note that you can also provide a named function to array_map, instead of providing the implementation inline, which can be nice in the event that your transform method gets more complicated. More on array_map here.
I have an array that contains names of arrays
$names_array[] = ('$array1', '$array2', $array3'....)
The $names_array[] is dynamically updated so it may contain 2 or more different names.
When the script is executed the values of listed arrays in $names_array[] need to be merged.
I think in case of merging it is not a problem
u can merge $result = array_merge($array1, $array2);
http://php.net/manual/en/function.array-merge.php
I think it can be done with variable variables.
$arraymerge = array();
foreach ($names_array as $arrayname)
{
$arraymerge = array_merge($arraymerge, ${$arrayname});
}
Thanks for help... I have went around the problem: if anyone needs to merge dynamically generated arrays, in my case I have six arrays that exist or not, so I need to merge the existing ones. What I did is:
if(!is_array($array1[$i])) $array1[$i]=array();
if(!is_array($array2[$i])) $array2[$i]=array();
if(!is_array($array3[$i])) $array3[$i]=array();
if(!is_array($array4[$i])) $array4[$i]=array();
if(!is_array($array5[$i])) $array5[$i]=array();
if(!is_array($array6[$i])) $array5[$i]=array();
$combineddata[$i]=array_merge($array1[$i], $array2[$i],$array3[$i],$array4[$i], $array5[$i], $array6[$i]);
In case 'array_x[$i]' doesn't exists array_merge doesn't break the script just merges empty array.
Thanks
$names_array = array ('array1', 'array2', 'array3');
$array1 = array ('a','b','c');
$array2 = array ('d','e','f');
$array3 = array ('g','h','i');
$result = array ();
foreach ($names_array as $x) {
$result = array_merge ($result, $$x);
}
print_r ($result);
How to add array items to an existing array with key => value ? actually i want to create an array of mysql rowset i.e.
$n =0;
while($row = mysql_fetch_array($rowset))
{
$array[$n] = array('name' => $row['name'], 'city' = $row['city']);
$n += 1;
}
Thanks.
Just try with:
$existingArray['newKey'] = 'new value';
Or use array_merge function:
$newArray = array_merge($existingArray, $additionalData);
http://php.net/manual/en/function.array-merge.php
That what you're looking for?
-edit-
Just to note, if conflicting results are found, the last most array entry will be used. If you array merge three arrays with id fields, only the final arrays id will be stored in the result.
You may want to look into this:
http://php.net/array_push
Should be simple enough.
For One:
$array['key'] = $value;
Merge:
$mergedArray = array_merge($array1, $array2);
(http://php.net/manual/en/function.array-merge.php)