What are some best practices for structuring PHP scripts to avoid issues with variable definitions?

To avoid issues with variable definitions in PHP scripts, it is best practice to define variables before using them to prevent errors like "Undefined variable." Additionally, using isset() or empty() functions can help check if a variable is defined before using it in the code. 

// Define variables before using them
$variable = 'value';

// Check if a variable is defined before using it
if(isset($variable)){
    // Use the variable here
    echo $variable;
}

Keywords

PHP variable scope global keyword namespaces include statement

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