Undefined index, when using mysqli_fetch_assoc, SELECT * [duplicate] - php

Question

This question already has answers here:
"Notice: Undefined variable", "Notice: Undefined index", "Warning: Undefined array key", and "Notice: Undefined offset" using PHP
(29 answers)
Closed 7 years ago.
I have simple inventory DB. When trying to access the products table and display the data in a table, i continually get "Unidentified index" and nothing i have found thus far can assist me. I am just starting PHP
conn.php
<?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "slfs_storesb";
// Create connection
$conn = new mysqli($servername, $username, $password, $database);
// Check connection
if ($conn->connect_errno) {
printf("Connection failed: %s\n" . $conn->connect_error);
}
?>
index.php
<?php
$sql = "select * from tbl_station";
$result = mysqli_query($conn,$sql);
while($row = mysqli_fetch_assoc($result)) {
var_dump($row);
// print $row[4];
//echo '<table id="t01">';
echo $row["Station_id"]." ".$row["Station_name"]." ". $row["Station_email"];
// echo '</table>';
}
// } else {
// echo "0 results";
// }
?>
THis is the error
Notice: Undefined index: Station_id in C:\wamp\www\stores\index_1.php on line 21
Call Stack
# Time Memory Function Location
1 0.0010 246504 {main}( ) ..\index_1.php:0
Gros Islet Fire Station
( ! ) Notice: Undefined index: Station_id in C:\wamp\www\stores\index_1.php on line 21
Call Stack
# Time Memory Function Location
1 0.0010 246504 {main}( ) ..\index_1.php:0
GFL Fire Hall
( ! ) Notice: Undefined index: Station_id in C:\wamp\www\stores\index_1.php on line 21
Call Stack
# Time Memory Function Location
1 0.0010 246504 {main}( ) ..\index_1.php:0
HeadQuarters
( ! ) Notice: Undefined index: Station_id in C:\wamp\www\stores\index_1.php on line 21
Call Stack
# Time Memory Function Location
1 0.0010 246504 {main}( ) ..\index_1.php:0
Dennery class footer { This is footer }

Answer 1

Instead of using SELECT * just spell out the (three) fields you want to access.
This way the query will fail if one of the fields is misspelled (or simply doesn't exist in that table).
<?php
$sql = '
SELECT
Station_id, Station_name, Station_email
FROM
tbl_station
';
$result = $conn->query($sql)
or trigger_error('query failed: '.join(',', $conn->error_list));
while( $row=$result->fetch_assoc() ) {
echo $row['Station_id'], ' ', $row['Station_name'],' ', $row["Station_email"], "<br />\r\n";
}