如何用PHP显示MySQL的字段名称

Question

I am trying to display field names from a MySQL query using PHP. I'm not getting anything to display when I print the field name into an HTML table and I'm not sure if this is how I should be going about getting the field names. Here is my code:

$i = 0;
while( $i < mysqli_num_fields($result)){
$field_names = mysqli_fetch_fields($result);
echo "<th>$field_names->name</th>";
$i++;}

Answer 1

mysqli_fetch_fields() returns an array of objects, not an object.

Try replacing the above mentioned code, with the following, this should work:

$fields=mysqli_fetch_fields($result);
foreach ($fields as $field) echo "<th>$field->name</th>";

or use the singular version of the function mysqli_fetch_field() in your original code.

For more information on how mysqli_fetch_fields work, check out the official documentation: http://php.net/manual/en/mysqli-result.fetch-fields.php