How can error checking and validation be improved in the provided PHP script to ensure smooth execution?

The provided PHP script can improve error checking and validation by implementing conditional statements to check for errors before executing critical operations. This can include checking if input values are set and valid, handling potential exceptions, and providing informative error messages to the user. 

// Check if the input values are set and valid before proceeding
if(isset($_POST['username']) && isset($_POST['password'])){
    $username = $_POST['username'];
    $password = $_POST['password'];

    // Validate the input values
    if(strlen($username) < 5 || strlen($password) < 8){
        echo "Username must be at least 5 characters and password must be at least 8 characters.";
        exit;
    }

    // Proceed with the rest of the script
    // Additional operations...
} else {
    echo "Please provide both username and password.";
}

Keywords

error checking validation PHP script smooth execution improvement

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