How should validation errors be handled in PHP scripts to prevent unwanted execution of code?

Validation errors in PHP scripts should be handled by using conditional statements to check for errors before executing any potentially harmful code. This can prevent unwanted execution of code and help maintain the security and integrity of the application. One common approach is to use if statements to check for validation errors and display appropriate error messages to the user. 

// Example of handling validation errors in PHP script
if ($_POST['username'] == '') {
    echo 'Username cannot be empty';
} elseif ($_POST['password'] == '') {
    echo 'Password cannot be empty';
} else {
    // Proceed with executing the code
}

Keywords

validation errors handling PHP scripts execution

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