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我有這段代碼，我不知道爲什麼它不會驗證。當它發現錯誤時，應顯示每個包含無效信息的無效字段，但不知何故，它顯示所有字段無效。這裏是我的代碼：驗證正則表達式在php
<?php
$debug =1;
$fname ="";
$valid_fname = 0;
$fname_regex = '/^([A-Z][a-z]){2,15}$/';
$fname_error = '<span>First name must be 2-15 charachters long.</span>';
$lname = "";
$valid_lname = 0;
$lname_regex = '/^([A-Z][a-z]){2,15}$/';
$lname_error = '<span>Last name must be 2-15 charachters long.</span>';
$phone_number = "";
$valid_phone = 0;
$phone_regex = '/^\d{3}-\d{3}-\d{4}$/';
$phone_error = '<span>Phone number must be xxx-xxx-xxxx format.</span>';
$city = "";
$valid_city = 0;
$city_regex = '/^([A-Z][a-z]){3,20}$/';
$city_error = '<span>City name must be 3-20 charachters.</span> ';
$state = "";
$valid_state = 0;
$state_regex = '/^([A-Z][a-z]){2}$/';
$state_error = '<span>State name must be 2 charachters.</span>';
$error_text = "";
$output_form = 1;
if(isset($_POST['submit'])) {
/*if($debug) {
echo "<pre>";
print_r($_POST);
echo "</pre>";
}*/
//debug only
$fname = trim($_POST['fname']);
$lname = trim($_POST['lname']);
$phone_number = trim($_POST['pnumber']);
$city = trim($_POST['city']);
$state = trim($_POST['state']);
if (preg_match($fname_regex, $fname)) {
$valid_fname =1;
} else {
$error_text.= "$fname_error<br>\n\r";
}
if (preg_match($lname_regex, $lname)) {
$valid_lname =1;
} else {
$error_text.= "$lname_error<br>\n\r";
}
if (preg_match($phone_regex, $phone_number)) {
$valid_phone =1;
} else {
$error_text.= "$phone_error<br>\n\r";
}
if (preg_match($city_regex, $city)) {
$valid_city =1;
} else {
$error_text.= "$city_error<br>\n\r";
}
if (preg_match($state_regex, $state)) {
$valid_state =1;
} else {
$error_text.= "$state_error<br>\n\r";
}
if ($valid_fname && $valid_lname && $valid_phone && $valid_city && $valid_state) {
$output_form = 0;
} else {
$error_text .= "<span>Please complete all the fields.</span>";
}
}//end of if(isset($_POST['submit']))
require_once("./inc/head.inc.php");
>
<body>
<div id="wrapper">
<?php require_once("./inc/header.inc.php"); ?>
<div class="content">
<?php
if($output_form) {
?>
<h3>Please fill out following information.</h3>
<?= $error_text ?>
<form class="myform" action="<?= $_SERVER['PHP_SELF'] ?>" method="post">
<p>First Name: <input name="fname" type="text" value="<?= $fname ?>">
<p>Last Name: <input name="lname" type="text" value="<?= $lname ?>">
<p>Phone Number <small>(Must be in xxx-xxx-xxxx format)</small><input name="pnumber" type="text" value="<?= $phone_number ?>"></p>
<p>City:<input name="city" type="text" value="<?= $city ?>"></p>
<p>State:<input name="state" type="text" value="<?= $state ?>"></p>
<div class="submit">
<input name="submit" type="submit" value="Send">
</div>
</form>
<?php
} else {
?>
<div class="output">
<h2>Your information is valid:</h2>
<p>Hello! <?= $fname .' '.$lname?></p>
<p>Phone: <?= $phone_number ?></p>
<p>Ciy, State : <?= $city . '' . $state ?></p>
</div>
</div>
<?php
}
?>
</div>
<?php require_once("./inc/footer.inc.php"); ?>
</body>