What is the significance of using quotation marks around array keys in PHP?

Using quotation marks around array keys in PHP is significant because it allows for the use of special characters, spaces, or reserved words as keys without causing syntax errors. When array keys are enclosed in quotation marks, PHP treats them as strings, allowing for more flexibility in naming keys. 

// Example of using quotation marks around array keys
$array = [
    "first key" => "value",
    "second key" => "value",
    "reserved word" => "value",
];

Keywords

PHP array keys quotation marks significance syntax

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