What best practices can be followed to avoid errors related to missing requirements in PHP scripts?

To avoid errors related to missing requirements in PHP scripts, it is essential to check for the existence of required variables or functions before using them in the code. This can be done using conditional statements or by using functions like isset() or function_exists() to ensure that the necessary components are present before proceeding with the script execution.

if(isset($required_variable)) {
    // Proceed with using $required_variable
} else {
    // Handle the missing requirement error
}