Lekhnath Lekhnath - 5 months ago 24
PHP Question

PHP - How to merge arrays inside array

How to merge n number of array in php. I mean how can I do the job like :

array_merge(from : $result[0], to : $result[count($result)-1])


OR

array_merge_recursive(from: $result[0], to : $result[count($result) -1])





Where
$result
is an array with multiple arrays inside it like this :

$result = Array(
0 => array(),//associative array
1 => array(),//associative array
2 => array(),//associative array
3 => array()//associative array
)


My Result is :

$result = Array(
0 => Array(
"name" => "Name",
"events" => 1,
"types" => 2
),
1 => Array(
"name" => "Name",
"events" => 1,
"types" => 3
),
2 => Array(
"name" => "Name",
"events" => 1,
"types" => 4
),
3 => Array(
"name" => "Name",
"events" => 2,
"types" => 2
),
4 => Array(
"name" => "Name",
"events" => 3,
"types" => 2
)
)


And what I need is

$result = Array(
"name" => "name",
"events" => array(1,2,3),
"types" => array(2,3,4)
)

Answer

array_merge can take variable number of arguments, so with a little call_user_func_array trickery you can pass your $result array to it:

$merged = call_user_func_array('array_merge', $result);

This basically run like if you would have typed:

$merged = array_merge($result[0], $result[1], .... $result[n]);

Update:

Now with 5.6, we have the ... operator to unpack arrays to arguments, so you can:

$merged = array_merge(...$result);

And have the same results.

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