我有一个PHP脚本，用于测试LAMP环境的各种功能，即phpmail，mysql连接和phpinfo。出于某种原因，每当我测试数据库连接并提交表单时，都不会显示任何结果。但是，如果您检查来源，结果会显示在源文本中，但不会出现在页面本身上。我整个周末都在看这个，而且我不知所措。
在这里粘贴：https://pastebin.com/SsKyFutK
数据库连接代码：
<div id="test_area" class="col-sm-8 tab-content">
<div class="dbConnectionTest tab-pane" id="db-connect" role="tabpanel" aria-labelledby="db-connect-link">
<?php
// Check to see if the form was submitted
if (isset($_POST['host'])) {
$dbhost = $_POST['host'];
$dbname = $_POST['database'];
$dbuser = $_POST['user'];
$dbpass = $_POST['pwd'];
$dbport = $_POST['port'];
if (strlen($dbport) < 4) { $dbport = 3306; }
if (!function_exists('gethostname')) {
$hostname = `hostname`;
$hostnamearray = explode('.', $hostname);
$hostname = $hostnamearray[0];
}
else $hostname = gethostname();
// Check to see if mysqli is available
if (!extension_loaded('mysqli') or $_POST['config'] == "mysql") {
$dbhost = $dbhost.':'.$dbport;
// Create connection
$con = @mysql_connect($dbhost,$dbuser,$dbpass);
// Check connection
if (mysql_error()) {
die("Failed to connect to MySQL using the PHP mysql extension: " . mysql_error());
}
mysql_select_db($dbname, $con);
// Query the database to show all the tables.
$query = 'SHOW tables;';
$result = mysql_query($query);
// Print the results of the query.
echo "Here is a list of the tables in your database:<br>";
echo "- $dbname <br>";
while($row = mysql_fetch_array($result)) {
echo "\ _ _ $row[0] <br>";
}
echo "<br>The connection to \"$dbname\" was successful!";
$extension = "MySQL";
mysql_close($con);
}
else {
// Create connection
$con = @mysqli_connect($dbhost,$dbuser,$dbpass,$dbname,$dbport);
// Check connection
if (mysqli_connect_errno()) {
die ("Failed to connect to MySQL using the PHP mysqli extension: " . mysqli_connect_error());
}
// Query the database to show all the tables.
$query = 'SHOW tables;';
$result = mysqli_query($con, $query);
// Print the results of the query.
echo "Here is a list of the tables in your database:<br>";
echo "- $dbname <br>";
while($row = mysqli_fetch_array($result)) {
echo "\ _ _ $row[0] <br>";
}
echo "<br>The connection to \"$dbname\" was successful!";
$extension = "MySQLi";
mysqli_close($con);
}
echo "<br>PHP extension used: " . $extension;
echo "<br>Server Name: " . $hostname;
unset($_POST);
}
// If we are not here because of a form submission, do the following.
else { ?>
<div class="card">
<div class="card-body">
<h3 class="card-title">Database Connection Test</h3>
<form method="post">
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="config">Connection:</label>
<div class="col-sm-9">
<select class="form-control form-control-sm" name="config" id="config">
<option value="auto" selected>Auto Select</option>
<option value="mysqli">MySQLi</option>
<option value="mysql">MySQL</option>
</select>
</div>
</div>
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="host">Host Name:</label>
<div class="col-sm-9">
<input type="text" class="form-control form-control-sm" id="host" name="host" autofocus>
</div>
</div>
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="database">DB Name:</label>
<div class="col-sm-9">
<input type="text" class="form-control form-control-sm" id="database" name="database">
</div>
</div>
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="user">User:</label>
<div class="col-sm-9">
<input type="text" class="form-control form-control-sm" id="user" name="user">
</div>
</div>
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="pwd">Password:</label>
<div class="col-sm-9">
<input type="password" class="form-control form-control-sm" id="pwd" name="pwd">
</div>
</div>
<div class="form-group row">
<label class="col-sm-3 col-form-label" for="port">Port (optional):</label>
<div class="col-sm-9">
<input type="nubmer" class="form-control form-control-sm" id="port" name="port" min="1" max="65535" value="3306">
</div>
</div>
<div class="text-center">
<button type="submit" class="btn btn-primary">Connect</button>
</div>
</form>
</div>
</div>
<?php
}
?>
</div>
如果那里的任何人可以伸出援手，我会非常感激。
编辑：这是源代码中未显示在渲染页面上的代码，来自GD上的测试帐户：
<body>
<header>
<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
<span class="navbar-brand mb-0 h1">Does PHP Work?</span>
</nav>
</header>
<div class="container-fluid wt-mt">
<div class="row">
<div class="col-sm-2 text-center">
<div class="nav flex-column" role="tablist" aria-orientation="vertical">
<a class="nav-link" id="db-connect-link" data-toggle="pill" href="#db-connect" role="tab" aria-controls="db-connect" aria-selected="true">DB Connection Test</a>
<a class="nav-link" id="form-mail-link" data-toggle="pill" href="#form-mail" role="tab" aria-controls="form-mail" aria-selected="false">Form Mailer Test</a>
<a class="nav-link" id="php-info-link" data-toggle="pill" href="#php-info" role="tab" aria-controls="php-info" aria-selected="false">PHP Info</a>
</div>
</div>
<div id="test_area" class="col-sm-8 tab-content">
<div class="dbConnectionTest tab-pane" id="db-connect" role="tabpanel" aria-labelledby="db-connect-link">
Here is a list of the tables in your database:<br>- hurdywordy <br>\ _ _ wp_commentmeta <br>\ _ _ wp_comments <br>\ _ _ wp_links <br>\ _ _ wp_options <br>\ _ _ wp_postmeta <br>\ _ _ wp_posts <br>\ _ _ wp_term_relationships <br>\ _ _ wp_term_taxonomy <br>\ _ _ wp_termmeta <br>\ _ _ wp_terms <br>\ _ _ wp_usermeta <br>\ _ _ wp_users <br><br>The connection to "hurdywordy" was successful!<br>PHP extension used: MySQLi<br>Server Name: p3plcpnl0520.prod.phx3.secureserver.net </div>