What is the difference between using constants and strings in PHP?

Using constants in PHP allows for defining a value that cannot be changed throughout the script, providing a way to store and reuse a specific value. On the other hand, strings in PHP are variables that can be changed or manipulated during the execution of the script. Constants are typically used for values that should remain constant, such as database credentials or API keys, while strings are used for dynamic data. 

// Using constants
define('DB_USERNAME', 'username');
define('DB_PASSWORD', 'password');

// Using strings
$dbUsername = 'username';
$dbPassword = 'password';

Keywords

constants strings PHP data types comparison

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