What is the purpose of using [] in array declaration in PHP and why does it affect functionality?

Using [] in array declaration in PHP is a shorthand way of creating an array without specifying keys. When using [] to declare an array, PHP automatically assigns numeric keys starting from 0. This can affect functionality if you need to access elements by specific keys or if you want to maintain a specific order of elements in the array. 

// Using [] in array declaration
$colors = ['red', 'green', 'blue'];

// To specify keys in the array declaration
$colors = ['first' => 'red', 'second' => 'green', 'third' => 'blue'];

Keywords

array declaration [] functionality PHP affect

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