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The fifth version of the PHP: Hypertext Preprocessor (PHP) scripting language. It features the Zend Engine 2, better object model support, and many other improvements over PHP 4.
1
vote
Validate array elements in PHP
I agree with @Gerrit0 that you should migrate to PHP7. Here is how I would do it:
$arr = [
0 => [],
1 => ['x' => 123],
2 => ['x' => 123, 'y' => 456],
3 => ['y' => 456]
];
$result = a …