What are the considerations when defining constants in PHP using the "define" function?

When defining constants in PHP using the "define" function, it's important to consider the constant name, its value, and whether it should be case-sensitive. Constants should follow naming conventions, typically using all uppercase letters with underscores separating words. Additionally, constants should be defined at the top of the file before any other code to ensure they are available throughout the script. 

// Define a constant in PHP
define("MAX_LOGIN_ATTEMPTS", 3);

// Example of using the defined constant
$loginAttempts = 0;

while($loginAttempts < MAX_LOGIN_ATTEMPTS) {
    // Attempt login logic
    $loginAttempts++;
}

Keywords

PHP define function constants naming conventions scope

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