Is there any difference between array_merge and array + array. Both return the same thing.
$merge = array_merge($arrayCar, $arrayBike);
and
$merged = $arrayCar+ $arrayBike;
- 6 years ago
The difference is:
The + operator takes the union of the two arrays, whereas the array_merge function takes the union BUT the duplicate keys are overwritten).
???????
here's a simple illustrative test:
$ar1 = [
0 => '1-0',
'a' => '1-a',
'b' => '1-b'
];
$ar2 = [
0 => '2-0',
1 => '2-1',
'b' => '2-b',
'c' => '2-c'
];
print_r($ar1+$ar2);
print_r(array_merge($ar1,$ar2));
with the result:
Array
(
[0] => 1-0
[a] => 1-a
[b] => 1-b
[1] => 2-1
[c] => 2-c
)
Array
(
[0] => 1-0
[a] => 1-a
[b] => 2-b
[1] => 2-0
[2] => 2-1
[c] => 2-c
)
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