Can't concatenate 2 arrays in PHP

Question

I've recently learned how to join 2 arrays using the + operator in PHP.

But consider this code...

$array = array('Item 1');  $array += array('Item 2');  var_dump($array); 

Output is

array(1) { [0]=> string(6) "Item 1" }

Why does this not work? Skipping the shorthand and using $array = $array + array('Item 2') does not work either. Does it have something to do with the keys?

Answer 1

Both will have a key of 0, and that method of combining the arrays will collapse duplicates. Try using array_merge() instead.

$arr1 = array('foo'); // Same as array(0 => 'foo') $arr2 = array('bar'); // Same as array(0 => 'bar')  // Will contain array('foo', 'bar'); $combined = array_merge($arr1, $arr2); 

If the elements in your array used different keys, the + operator would be more appropriate.

$arr1 = array('one' => 'foo'); $arr2 = array('two' => 'bar');  // Will contain array('one' => 'foo', 'two' => 'bar'); $combined = $arr1 + $arr2; 

Edit: Added a code snippet to clarify

Answer 2

Use array_merge()
See the documentation here:
http://php.net/manual/en/function.array-merge.php

Merges the elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the resulting array.