I want to split an array according to sub_id
my main array:
$my_main_array = [
['id' => 1, 'sub_id' => 8],
['id' => 2, 'sub_id' => 9],
['id' => 3, 'sub_id' => 8],
['id' => 3, 'sub_id' => 9],
['id' => 3, 'sub_id' => 9],
];
The result should be,The first array:
sub_id equal 8
sub_id equal 8
The second array
sub_id equal 9
sub_id equal 9
sub_id equal 9
I am a bit late, but I was facing this problem today, so I thought I could let my solution here because maybe someone find it useful.
You can let this function created:
function array_split($original_array, $callback) {
$return = [[],[]]; // initialize both arrays we will use as output
foreach( $original_array as $item ) {
// Add each item to the corresponding array, according to the callback output
$return[$callback($item)][] = $item;
}
return $return;
}
and then use it like this:
[$sub_id_9_array, $sub_id_8_array] = array_split(
$my_main_array,
function($item) { return $item['sub_id'] == 8;}
);
$arrayA = [];
$arrayB = [];
array_map(function($value) use (&$arrayA, &$arrayB) {
if ($value['sub_products_id'] == 8) {
$arrayA[] = $value;
} else {
$arrayB[] = $value;
}
}, $originalArray);
array_map. If you discard its return value (and don't even build it), it's completely useless. I juste ran some (very basic) benchmarks and I found that a foreach is at least twice as fast as this array_map usage (it builds and return an extra array with all values to null and adds costly function calls).Use array_filter() with a callback that matches against your condition
$key = 8;
$first = array_filter(
$originalArray,
function($value) use ($key) {
return $value['sub_products_id'] == $key;
}
);
$key = 9;
$second = array_filter(
$originalArray,
function($value) use ($key) {
return $value['sub_products_id'] == $key;
}
);
$inputArray = [
[ 'id' => 1, 'sub_id' => 8 ],
[ 'id' => 2, 'sub_id' => 9 ],
[ 'id' => 3, 'sub_id' => 8 ],
[ 'id' => 3, 'sub_id' => 9 ],
[ 'id' => 3, 'sub_id' => 9 ],
];
[ 'a' => $arrayA, 'b' => $arrayB ] = array_reduce(
$inputArray,
static fn($carry, $item) => array_merge_recursive(
$carry,
[ $item['sub_id'] === 8 ? 'a' : 'b' => [ $item ] ]
),
[ 'a' => [], 'b' => [] ]
);
