How to get part of array excluding one key in multidimensional array? - php

Question

I'm grouping one multidimensional array by age.
This is my code:
$mEmployees = array (
array("name"=>"Pedro", "age"=>20, "ID"=>1111),
array("name"=>"Carlos", "age"=>15, "ID"=>2222),
array("name"=>"Susana", "age"=>20, "ID"=>3333),
array("name"=>"Carmen", "age"=>19, "ID"=>4444)
);
$byAge=array();
foreach ($mEmployees as $k => $oneItem) {
$byAge[$oneItem['age']][$k] = $oneItem;
}
var_dump($byAge);
That works fine as you can see below:
output:
array(3) {
[20]=>
array(2) {
[0]=>
array(3) {
["name"]=>
string(5) "Pedro"
["age"]=>
int(20)
["ID"]=>
int(1111)
}
[2]=>
array(3) {
["name"]=>
string(6) "Susana"
["age"]=>
int(20)
["ID"]=>
int(3333)
}
}
[15]=>
array(1) {
[1]=>
array(3) {
["name"]=>
string(6) "Carlos"
["age"]=>
int(15)
["ID"]=>
int(2222)
}
}
[19]=>
array(1) {
[3]=>
array(3) {
["name"]=>
string(6) "Carmen"
["age"]=>
int(19)
["ID"]=>
int(4444)
}
}
}
But in the results, the age key is redundant. I want to remove this key in the $byAge array.
I tried with array_slice, but it's not possible to indicate one irregular offset (the key age is in middle).
How I can achieve this easily for this result?
array(3) {
[20]=>
array(2) {
[0]=>
array(3) {
["name"]=>
string(5) "Pedro"
["ID"]=>
int(1111)
}
[2]=>
array(3) {
["name"]=>
string(6) "Susana"
["ID"]=>
int(3333)
}
}
[15]=>
array(1) {
[1]=>
array(3) {
["name"]=>
string(6) "Carlos"
["ID"]=>
int(2222)
}
}
[19]=>
array(1) {
[3]=>
array(3) {
["name"]=>
string(6) "Carmen"
["ID"]=>
int(4444)
}
}
}

Answer 1

Cache the age value in a variable and unset from $oneItem.
foreach ($mEmployees as $k => $oneItem) {
$age = $oneItem['age'];
unset($oneItem['age']);
$byAge[$age][$k] = $oneItem;
}
Demo: https://3v4l.org/pDDn5