当我使用var_dump时，此处的$time变量显示为null。然而，在数据库中，时间显示为上午9点。我正试图通过电子邮件发送乘客想要接走的时间。为什么$time是null？我该如何解决这个问题？
<?php
error_reporting(E_ALL);
ini_set('display_errors',1);
$host="localhost"; // Host name
$username="user"; // Mysql username
$password="password"; // Mysql password
$db_name="mydb"; // Database name
$tbl_name="pickuprequests"; // Table name
// Connect to server and select database.
$link = mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name", $link)or die("cannot select DB");
//names of the passengers in option tags
$name = $_POST['name'];
//this query gets all the records from pickuprequests of the passenger selected
$query="SELECT * FROM $tbl_name WHERE name = '$name'";
$result=mysql_query($query, $link);
// get the location of the passenger from $result
$search_loc = mysql_fetch_array($result);
$loc = $search_loc['location'];
//get time of pickup
$search_time = mysql_fetch_array($result);
$time = $search_time['time'];
//find how many rows are returned with the passenger name
$search_row = mysql_query($query, $link);
$count = mysql_num_rows($search_row);
//deletes a record assoc with passenger name
$delete_query = "DELETE FROM pickuprequests WHERE name = '$name'";
//message for the passenger
$msg_passenger = "Your driver is on the way! You will receive one last email when the driver arrives.";
$subject_passenger = "Driver on the way";
$mailheaders = "MIME-Version: 1.0"."'r'n";
$mailheaders .= "Content-type: text/html; charset=iso-8859-1"."'r'n";
$mailheaders .= "From: TripoZipo <tripozipo.com>"."'r'n";
//passengers email in diff table assoc with name selected from option tags
$query_email = "SELECT * FROM tzmember WHERE name = '$name'";
$get_email = mysql_query($query_email,$link);
$search_email = mysql_fetch_array($get_email);
$email = $search_email['email'];
//message for the driver
$msg_driver = sprintf(
"
<html>
<body>
<table border='1'>
<tr>
<td>Passenger</td><td>Location</td><td>Time</td>
</tr>
<tr>
<td>%s</td><td>%s</td><td>%s</td>
</tr>
</table>
</body>
</html>
",
$name,
$loc, $time);
$subject_driver = "Passenger Location";
//drivers email is the session name for driver.php
$driver = $_SESSION['driver'];
//on submit and if a passenger is selected run code
if(isset($_POST['submit']) && isset($_POST['name'])) {
//$count returns all the rows assoc with passenger name
if($count) {
//mail($email, $subject_passenger, $msg_passenger, $mailheaders); // email passenger your ride is on the way
mail($driver, $subject_driver, $msg_driver, $mailheaders); // email driver the location
//mysql_query($delete_query, $link); // finally delete the request as its not pending anymore
//echo "<script type='text/javascript'> document.location = 'http://mobile.tripozipo.com/confirmation2.php'; </script>";
}
else { //else if no rows are returned
}
}
?>
对mysql_fetch_array的调用从结果集中返回一个完整的ROW，而不仅仅是一列。所以你只需要调用它一次，而不是每次你试图从行中获取值时。
<?php
error_reporting(E_ALL);
ini_set('display_errors',1);
$host="localhost"; // Host name
$username="username"; // Mysql username
$password="password"; // Mysql password
$db_name="dbname"; // Database name
$tbl_name="pickuprequests"; // Table name
// Connect to server and select database.
$link = mysql_connect("$host", "$username", "$password")or die("cannot connect");
mysql_select_db("$db_name", $link)or die("cannot select DB");
//names of the passengers in option tags
$name = $_POST['name'];
//this query gets all the records from pickuprequests of the passenger selected
$query="SELECT * FROM $tbl_name WHERE name = '$name'";
$result=mysql_query($query, $link);
// get the location of the passenger from $result
$row = mysql_fetch_array($result);
$loc = $row['location'];
//get time of pickup
//$search_time = mysql_fetch_array($result);
$time = $row['time'];
//find how many rows are returned with the passenger name
//$search_row = mysql_query($query, $link);
$count = mysql_num_rows($result);
//deletes a record assoc with passenger name
$delete_query = "DELETE FROM pickuprequests WHERE name = '$name'";
//message for the passenger
$msg_passenger = "Your driver is on the way! You will receive one last email when the driver arrives.";
$subject_passenger = "Driver on the way";
$mailheaders = "MIME-Version: 1.0"."'r'n";
$mailheaders .= "Content-type: text/html; charset=iso-8859-1"."'r'n";
$mailheaders .= "From: TripoZipo <tripozipo.com>"."'r'n";
//passengers email in diff table assoc with name selected from option tags
$query_email = "SELECT * FROM tzmember WHERE name = '$name'";
$get_email = mysql_query($query_email,$link);
$search_email = mysql_fetch_array($get_email);
$email = $search_email['email'];
//message for the driver
$msg_driver = sprintf(
"
<html>
<body>
<table border='1'>
<tr>
<td>Passenger</td><td>Location</td><td>Time</td>
</tr>
<tr>
<td>%s</td><td>%s</td><td>%s</td>
</tr>
</table>
</body>
</html>
",
$name,
$loc, $time);
$subject_driver = "Passenger Location";
//drivers email is the session name for driver.php
$driver = $_SESSION['driver'];
//on submit and if a passenger is selected run code
if(isset($_POST['submit']) && isset($_POST['name'])) {
//$count returns all the rows assoc with passenger name
if($count) {
//mail($email, $subject_passenger, $msg_passenger, $mailheaders); // email passenger your ride is on the way
mail($driver, $subject_driver, $msg_driver, $mailheaders); // email driver the location
//mysql_query($delete_query, $link); // finally delete the request as its not pending anymore
//echo "<script type='text/javascript'> document.location = 'http://mobile.tripozipo.com/confirmation2.php'; </script>";
}
else { //else if no rows are returned
}
}
?>
请不要使用
mysql_数据库扩展，它已被弃用（在PHP7中永远消失）特别是如果你只是在学习PHP，花精力学习PDO或mysqli_数据库扩展，这里有一些帮助来决定使用