Why is it important to use quotation marks when assigning values to keys in an array in PHP?

When assigning values to keys in an array in PHP, it is important to use quotation marks because PHP treats keys as strings by default. If you do not use quotation marks, PHP will assume the key is a constant and will try to find its value, which can lead to unexpected behavior or errors. By using quotation marks, you explicitly define the key as a string and avoid any confusion. 

// Incorrect way of assigning values to keys without quotation marks
$array = [1 => 'value1', 2 => 'value2'];

// Correct way of assigning values to keys with quotation marks
$array = ['1' => 'value1', '2' => 'value2'];

Keywords

quotation marks array keys values PHP

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