What best practices can be followed to ensure that variables are properly defined and used in PHP code to avoid errors like Notice: Undefined variable?

When working with PHP code, it is important to properly define variables before using them to avoid errors like "Notice: Undefined variable". To prevent this issue, always initialize variables before using them, either by assigning a default value or by checking if they are set using isset(). This ensures that variables are always defined and avoids errors due to uninitialized variables. 

// Initialize the variable with a default value
$variable = '';

// Check if the variable is set before using it
if(isset($variable)) {
    // Use the variable here
}

Keywords

PHP variable declaration error handling isset function strict typing

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