PHP - How to combine two arrays with different number of elements? - php

Question

I have two arrays:
One:
array(4) {
[0]=> array(2) {
[0]=> string(19) "Ford"
[1]=> string(1) "1"
}
[1]=> array(2) {
[0]=> string(15) "Chevrolet"
[1]=> string(1) "1"
}
[2]=> array(2) {
[0]=> string(7) "VW"
[1]=> string(1) "1"
}
[3]=> array(2) {
[0]=> string(4) "Fiat"
[1]=> string(1) "3"
}
}
Two:
array(6) {
[0]=> string(7) "#581845"
[1]=> string(7) "#900C3F"
[2]=> string(7) "#C70039"
[3]=> string(7) "#FF5733"
[4]=> string(7) "#FFC300"
[5]=> string(7) "#DAF7A6"
}
Now, I need the first array combining with the second, excluding the elements of the second array that are not used by the first. At the end, I want to receive an array like:
[0]=> {
[0]=> "Ford",
[1]=> "1",
[2]=>"#581845"
}
[1]=>
...
}

Answer 1

Provided you always have more colors than auto makes, you can do this:
$makes = [
[
"Ford",
"1"
],
[
"Chevrolet",
"1"
],
[
"VW",
"1"
],
[
"Fiat",
"3"
]
];
$colors = [
"#581845",
"#900C3F",
"#C70039",
"#FF5733",
"#FFC300",
"#DAF7A6"
];
foreach($makes as &$currMakeTuple)
{
$currMakeTuple[] = array_shift($colors);
}
print_r($makes);
Array
(
[0] => Array
(
[0] => Ford
[1] => 1
[2] => #581845
)
[1] => Array
(
[0] => Chevrolet
[1] => 1
[2] => #900C3F
)
[2] => Array
(
[0] => VW
[1] => 1
[2] => #C70039
)
[3] => Array
(
[0] => Fiat
[1] => 3
[2] => #FF5733
)
)
You should probably check that condition and have a contingency for it.

Answer 2

Another one solution. Independent of the number of colors. Will add to brands only those colors which keys are equal to the brands' keys.
$brands = [
['Ford', 1],
['Chevrolet', 1],
['VW', 1],
['Fiat', 3],
];
$colors = [
'#581845',
'#900C3F',
'#C70039',
'#FF5733',
'#FFC300',
'#DAF7A6',
];
array_walk($brands, function(&$value, $key, $colors) {
if (isset($colors[$key])) {
$value = array_merge($value, [$colors[$key]]);
}
}, $colors);
print_r($brands);

Answer 3

I'm not saying you should do it this way, but I thought it was worth showing an alternative that used array functions instead:
var_dump(array_map(function($make, $color) {
$make[] = $color;
return $make;
}, $makes, array_slice($colors, 0, count($makes))));
I used:
array_slice to reduce the $colors array, should it be too long.
array_map with a lambda (anonymous function) that will apply the lambda to each element and return the final array upon completion.