Merging 3 arrays in PHP - php

Question

I have 3 arrays as below.
$array1 = Array
(
[0] => 05/01
[1] => 05/02
)
$array2 =Array
(
[0] => ED
[1] => P
)
$array3 =Array
(
[0] => Mon
[1] => Tue
)
I want to merge these 3 arrays as below $result_array. I have written a code as below. But It gave a empty array.
$result_array =Array
(
[0] => Array
(
[0] => 05/01
[1] => ED
[2] => Mon
)
[1] => Array
(
[0] => 05/02
[1] => P
[2] => Tue
)
)
Code:
for($z=0; $z<count($array1); $z++){
$all_array[$z][] = array_merge($array1[$z],$array2[$z] );
$all_array2[$z] = array_merge($all_array[$z],$array3[$z] );
}
Please help me to do this.

Answer 1

Simply foreach over the first array and use the index as the key to the other arrays.
foreach ( $array1 as $idx => $val ) {
$all_array[] = [ $val, $array2[$idx], $array3[$idx] ];
}
Remember this will only work if all 3 arrays are the same length, you might like to check that first

Answer 2

You can simply walk through the first array with a foreach loop then access the corresponding arrays and combine the results into one big array. This will only work if the arrays are the same length so it's worth checking that before to stop any errors. Something like this:
<?php
$arr1 = ['05/01', '05/02'];
$arr2 = ['ED', 'P'];
$arr3 = ['Mon', 'Tue'];
$combined = [];
if (count($arr1) != count($arr2) || count($arr1) != count($arr3))
die("Array lengths do not match!");
foreach ($arr1 as $key => $val) {
$combined[] = [$val, $arr2[$key], $arr3[$key]];
}
var_dump($combined);
You can see an eval.in of this working here - https://eval.in/833893

Answer 3

Create an sample array and push to each array value with respective key
$sample = array();
for($z=0; $z<count($array1); $z++){
$sample[]=array($array1[$z],$array2[$z],$array3[$z]);
}
print_r($sample);
Out put is
Array ( [0] => Array (
[0] => 05/01
[1] => ED
[2] => Mon
)
[1] => Array (
[0] => 05/02
[1] => P
[2] => Tue
)
)

Answer 4

this work for n of arrays and dynamic length of array
function mergeArrays(...$arrays)
{
$length = count($arrays[0]);
$result = [];
for ($i=0;$i<$length;$i++)
{
$temp = [];
foreach ($arrays as $array)
$temp[] = $array[$i];
$result[] = $temp;
}
return $result;
}
$x = mergeArrays(['05/01' , '05/02'] , ['ED' , 'P'] , ['Mon' , 'Tus']);
$y = mergeArrays(['05/01' , '05/02' , 'X'] , ['ED' , 'P' , 'Y'] , ['Mon' , 'Tus' , 'Z'] , ['A' , 'B' , 'C']);
var_dump($x);
var_dump($y);

Answer 5

function merge($file_name, $titles, $description)
{
$result = array();
foreach($file_name as $key=>$name )
{
$result[] = array( 'file_name' => $name, 'title' => $titles[$key],
'description' => $description[ $key ] );
}
return $result;
}

Answer 6

$array1 = Array
(
'05/01',
'05/02'
);
$array2 = Array
(
'ED',
'P'
);
$array3 =Array
(
'Mon',
'Tue'
);
$result_array = array();
foreach ($array1 as $key=>$val)
{
$result_array[$key] = array($array1[$key],$array2[$key],$array3[$key]);
}
echo "<PRE>"; print_r($result_array);