我是新来的php n我正试图使电话到时区转换器。我在第49行得到错误未定义变量'$result'我怎么解决它?还有，如果你能找出我犯的其他错误请检查我犯的错误电话号码:
<button type="submit" name="submit" action="submit">
Submit
</button>
</form>
<?php
$servername = "127.0.0.1";
$username = "root";
$password = "";
$ccode=$_POST["phone"];
// Create connection
$db = new mysqli($servername, $username, $password);
// Check connection
if ($db->connect_error) {
die("Connection failed: " . $db->connect_error);
}
$pattern = '/^'(?['d]{1,4}')?( |-)?/';
if(preg_match($pattern, $ccode, $matches))
{
$code = $matches[0];
} else $code = substr($ccode, 0, 4);
$q = "SELECT nicename FROM country.country WHERE phonecode=$code";
if($query = $db->query($q))
{
$record = $query->fetch_assoc();
} else echo "<br/>NO RECORD";
echo '<pre>';print_r($record);
if (empty($_POST["phone"]))
{
echo "<p>Please write a Phone Number!</p>";
}
$abb = "SELECT zone_id FROM zone INNER JOIN country on country.country_code = zone.country_code
WHERE country.country_name = " . $record['nicename'];
if($query = $db->query($abb))
{
$result = $query->fetch_assoc();
} else echo "<br/>NO RECORD";
echo '<pre>';print_r($result);
?>
</body>
谢谢你的帮助!
我相信这样可以。我不确定$code，如果他包含正确的信息，你可以通过回显$code来检查。
if(preg_match($pattern, $ccode, $matches))
{
$code = $matches[0];
} else { $code = substr($ccode, 0, 4); }
$q = "SELECT nicename FROM country WHERE phonecode=$code";
if($query = $db->query($q))
{
$record = $query->fetch_assoc();
echo '<pre>';
print_r($record);
} else { echo "<br/>NO RECORD"; }
$abb = "SELECT zone_id FROM zone INNER JOIN country on country.country_code = zone.country_code
WHERE country.country_name = '" . $record['nicename'] . "'";
if($query = $db->query($abb))
{
$result = $query->fetch_assoc();
echo '<pre>';
print_r($result);
//Here $result will exist!
} else { echo "<br/>NO RECORD"; }
// You had your $result here, and here, the result may not exist,
// depending if the query succeeded or not.
// Same counts for the query above.
据我所知有两个问题。
1是您试图打印$record，而$record可能不存在，并且对$result进行相同计数。
2是区域查询，如果您检查列/字段是否等于某个字符串，则确保字符串周围有引号。所以country_name =‘东西’。你没有在$record['nicename']周围加引号，所以不管$record['nicename']是什么，他都认为这是一个列/字段，而不是一个值。