谢谢
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "db";
global $country;
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT meta_value FROM `wp_usermeta` where user_id=$user_id and meta_key='custom_field_6' ";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
$country = $row["meta_value"];
echo $country;
}
} else {
echo "0 results";
}
$conn->close();
?>
第二个代码（在这里我想显示此查询的数据（选择emr_value从country_name=$国家））
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "db";
global $country;
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "select emr_value from countries where country_name='$country'";
$result = $conn->query($sql);
while($row = $result->fetch_assoc()) {
$emr_value = $row["emr_value"];
echo "<h1>EMR : " . $emr_value . "</h1>";
}
$conn->close();
?>
也许您应该只有一个代码：
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "db";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "SELECT meta_value FROM wp_usermeta WHERE user_id='$user_id' AND meta_key='custom_field_6'";
$result1 = $conn->query($sql);
if ($result1->num_rows > 0) {
// output data of each row
while ($row1 = $result1->fetch_assoc()) {
$country = trim($row1["meta_value"]);
$sql = "SELECT emr_value FROM countries WHERE country_name='$country'";
$result2 = $conn->query($sql);
while ($row2 = $result2->fetch_assoc()) {
echo "<h1>EMR : " . $row2["emr_value"] . "</h1>";
}
}
} else {
echo "0 results";
}
$conn->close();
?>
或者在一个代码中创建两个函数：一个返回$country，另一个返回emr_值。
