How can the issue of undefined variables, such as '$input', be addressed in PHP scripts to prevent errors?

When using undefined variables in PHP scripts, it can lead to errors or unexpected behavior. To prevent this, you can use the isset() function to check if a variable is set before using it. This way, you can avoid errors and handle cases where variables are not defined. 

if(isset($input)){
    // Use $input here
    echo $input;
} else {
    // Handle case where $input is not set
    echo "Input is not defined";
}

Keywords

undefined variables error handling isset function error_reporting debugging

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