trjhtr

I have an associative array:

$input = [
 ['key'=>'x', 'value'=>'a'],
 ['key'=>'x', 'value'=>'b'],
 ['key'=>'x', 'value'=>'c'],
 ['key'=>'y', 'value'=>'d'],
 ['key'=>'y', 'value'=>'e'],
 ['key'=>'z', 'value'=>'f'],
 ['key'=>'m', 'value'=>'n'],
];

And I want to reform it simple in:

$output = [
 'x'=>['a','b','c'],
 'y'=>['d','e'],
 'x'=>'f',
 'm'=>'n'
]

So basically, conditions are:

1. If same key found then put values in an array.


2. If no same key found then value remains string.

You can replace associative array with object if you are more comfortable with objects.

Here is my working solution for this problem:

foreach($input as $in)
 if(!empty($output[$in['key']]))
 if(is_array($output[$in['key']]))
 $output[$in['key']] = $in['value'];
 continue;
 
 $output[$in['key']] = [$output[$in['key']],$in['value']];
 continue;
 
 $output[$in['key']] = $in['value'];
 
print_r($output);

However I believe that it can be done in much compact and efficient way.
Please comment your answers if someone has better solution.
Your help is much appreciated!