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Found 1 result

  1. Truman

    Not understanding if-else statement

    I'm working of registration form and I have a problem with understanding one of the codes. <?php // Script 8.9 - register.php define ('DEFINE', 'register'); include('templates/header.html'); print '<h2>Registration Form</h2> <p>Register so that you can take advantage of certain features like this, that, and the other things</p>'; print '<style type="text/css" media="screen"> .error { color: red; } </style>'; if ($_SERVER['REQUESTED_METHOD'] == 'POST') { $problem = FALSE; if (empty($_POST['first_name'])) { $problem = TRUE; print '<p class="error">Please enter your first name!</p>'; } if (empty($_POST['last_name'])) { $problem = TRUE; print '<p class="error">Please enter your last name!</p>'; } if (empty($_POST[email'])) { $problem = TRUE; print '<p class="error">Please enter your email address.</p>'; } if (empty($_POST['password1'])) { $problem = TRUE; print '<p class="error">Please enter a password.</p>'; } if ($_POST['password1'] != $_POST['password2']) { $problem = TRUE; print '<p class="error">Your password did not match your confirm password.</p>'; } if (!$problem) { print '<p>You are now registered.</p>' } $_POST = array(); } else { print '<p class="error">Please try again!</p> } } ?> this part: if (!$problem) { print '<p>You are now registered.</p>' } Why are we using exclamation mark here? I already defined $problem = FALSE at the beginning of the whole code. That means that there is no problem. If we reverse it to TRUE it will mean that there is a problem with registration but in that case the user shouldn't see "You are now registered". The if condition is fulfilled in any case because with don't have any '<', '>' or '=='.
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