PHP initialize multimensional arrays before increment

Question

I have to perform a big code fix in an old php project. The issue is the following: I have a number statements where the code tries to add integers to non-initialized multimensional arrays, like this:

$array_test['first']['two']['three'] += 10;

But $array_test is declared just like this:

$array_test = array();

This situation gives me a lot of warnings in the project cause this code pattern happens like 16k times.

Is there any way to solve this like adding a statement like this:

if (!isset($array_test['first']['two']['three'])) 
{
         $array_test['first']['two']['three']=0;
}

and then

$array_test['first']['two']['three'] += 10;

But I would like to do it in only one code line (for both statement, the if isset and the increment) in order to make a big and safe replace in my project.

Can someone help me? Thanks and sorry for my english.

Answer 1

PHP does not yet (and probably won't ever) have a "null coalescing addition operator.

From PHP7.0, you can avoid the isset() call by null coalescing to 0. Demo

$array_test['first']['two']['three'] = ($array_test['first']['two']['three'] ?? 0) + 10;

If below PHP7 (all the way down to at least PHP4.3), you can use an inline (ternary) condition. Demo

$array_test['first']['two']['three'] = (isset($array_test['first']['two']['three']) ? $array_test['first']['two']['three'] : 0) + 10;