当我使用$time时，null变量显示为var_dump。然而在数据库中，时间显示为上午9点。我正在尝试通过电子邮件发送乘客想要接听的时间。为什么$time null以及如何解决此问题？
<?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
}
}
?>
答案 0 :(得分：2)
对pip freeze --local > requirements.txt的调用会从结果集中返回完整的ROW，而不仅仅是单个列。因此，您只需要调用一次，而不是尝试从行中获取值的外翻时间。
mysql_fetch_array请不要使用
<?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 } } ?>数据库扩展，不推荐使用（在PHP7中永远消失） 特别是如果您只是学习PHP，请花时间学习mysql_或PDO数据库扩展， and here is some help to decide which to use