List all the tables in your MySQL database using PHP - php

Question

I have a hard time trying to list all the tables in my database.
I tried
<?php
//Configuration
$dbname = 'local';
$user = 'root';
$host = '127.0.0.1';
$pass = '';
$date = date('Y-m-d');
$export_type = 'mysql'; // option : mysql | psql
$file_name = $date.'-portal';
$file_path = $file_name;
// Create connection
$conn = mysqli_connect($host, $user, $pass);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";
$sql = "SHOW TABLES FROM $dbname";
$res = mysqli_query($conn, $sql);
if($res != false){
echo "Connected successfully";
$FILE = fopen("output.csv", "w");
$table = array();
while($row = mysql_fetch_array($res)){
$table[] = $row['0'];
}
foreach($tables as $table) {
$columns = array();
$res = mysqli_query($conn, "SHOW COLUMNS FROM $table");
while($row = mysql_fetch_array($res, MYSQL_NUM)) {
$columns[] = "$row[0]";
}
fwrite($FILE, implode(",", $columns)); fwrite("\n");
$resTable = mysqli_query($conn, "SELECT * FROM $table");
while($row = mysql_fetch_array($resTable, MYSQL_NUM)) {
fwrite($FILE, implode(",", $row)); fwrite("\n");
}
}
}else{
die(mysql_error());
}
?>
Result
if($res != false){
//.. everything in here never get executed
}
`$res` kept returning `false`.
What did I do wrong that could have lead to this ?

Answer 1

You can always execute the query:
Show tables;
After you selected database.
By the way you also can execute:
Show databases;
To list all of the databases your current user has permission to view.

Answer 2

Use db in your connection
mysqli_connect($host, $user, $pass, $dbname);
And use query like this
$sql = "SHOW TABLES";

Answer 3

You need to pass through your database in the connection script.
Like so:
$conn = mysqli_connect($host, $username, $pass, $dbname);
Then, when you want to pull rows from a table, you do it like this:
mysqli_query($conn, "SELECT rows FROM table");
One of the reasons this wasn't working for you was because you weren't passing through your database name through the connection. Also, rather than doing the above query, you selected a table from a database; rather than a row from a table.
Also, I noticed that you're using the mysql_* error output on the last line.

Answer 4

Here is a working version
Changes:
Added $dbname to mysqli_connect function
Added the backtick ` char between the table names, to avoid errors with reserved keyword from MySQL
Changed mysql_ functions to mysqli_
Close the file
Close the connection
Here is the code
NOTE: sorry I don't why, but when I pasted the code in the answer, all de code identation was messed up, even trying to indent it properly, I wasted like 10 minutes :(