If a URL field in a PHP form does not validate, you can display an error message by ______.
- Showing a popup
- Using the header() function to redirect
- Echoing an error message
- Using the die() function
If a URL field in a PHP form does not validate, you can display an error message by echoing an error message to the user. This can be done by using PHP's echo statement to output the error message directly on the webpage. This way, the user will be notified of the invalid URL input. For more information on error handling in PHP, you can visit: php.net/manual/en/function.echo.php
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