What are some recommended debugging techniques for PHP scripts, especially when dealing with undefined index errors?

When dealing with undefined index errors in PHP scripts, one recommended debugging technique is to check if the index exists before trying to access it. This can be done using the isset() function to determine if the index is set in the array. By adding this check, you can prevent the script from throwing an error when trying to access an undefined index. 

if(isset($_POST['submit'])){
    // Check if the index 'submit' exists before accessing it
    // Your code here
}

Keywords

PHP debugging techniques undefined index errors error handling var_dump

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