Creating a Config File in PHP

Creating a config file in PHP

One simple but elegant way is to create a config.php file (or whatever you call it) that just returns an array:


return array(
'host' => 'localhost',
'username' => 'root',

And then:

$configs = include('config.php');

Best Way to create configuration file(config.php) php

i find best way to create config.php file for my project


include 'config.php';
$conn= new PDO("mysql:host=$host;dbname=$dbname",$config['DB_USERNAME'],$config['DB_PASSWORD']);
//new PDO("mysql:host=$hostname;dbname=mysql", $username, $password);
catch(PDOException $e)
echo "Error:".$e->getMessage();



I want a create a config file, using the values of the form

to create the config file from the user input, you can create an empty config.php file then use fwrite and fopen to open and write to that file.


$errors = "";
if (isset($_POST["submit"])) {
if (empty($_POST['servername'])) {

echo "Enter servername";
} else {

$servername = $_POST['servername'];

if (empty($_POST['username'])) {

echo "enter username";
} else {

$username = $_POST['username'];

if (empty($_POST['password'])) {

echo "enter password";
} else {

$password = $_POST['password'];

if (empty($_POST['dbname'])) {

echo "enter database";
} else {

$dbname = $_POST['dbname'];

if ($errors <= 0) { // no errors

$string = '<?php
$dbhost = "' . $servername . '";
$dbuname = "' . $username. '";
$dbpass = "' . $password . '";
$dbname = "' . $dbname . '";

$fp = fopen("config.php", "w");
if (fwrite($fp, $string)) {

echo "db created";




<!DOCTYPE html>
<form name="form" method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
<tr><td colspan="2" align="center"> Database </tr>
<td><input type="text" name="servername" value="" ></td></tr>
<td><input type="text" name="username" value="" ></td>
<td><input type="text" name="password" value="" ></td>
<tr><td>Database Name:</td>
<td><input type="text" name="dbname" value="" > </td>
<tr><td colspan="2" align="center"><input type="submit" name="submit"></td></tr>

How to import a config.php file in a php script

The problem with the code is that you're not actually returning the config in your MailConfiguration.php. You define it as a variable, which you never use in the constructor.

Instead of storing the config array in a variable in your config file, do:

return [
'mailSender' => '',
'mailSubject' => 'XXX',
'maxConnections' => 400,
'maxTime' => 600,
'csv' => 'mailaccounts.csv',

Now the config array will be loaded into $this->mailConfigs in your constructor.

Then, when you want to use it, just do:

public function getMailConfig()
return $this->mailConfigs;

since it contains the same array as you returned in the config file.


It's good to build configs so you can load different config files for different environments (prod, staging, local, testing etc). So would suggest that you pass the path to the config file to the constructor. Then you can pass different files for different environments. Example:

public function __construct($configFile)
$this->mailConfigs = require $configFile;

and when you instantiate the class:

$mailer = new Mailer(__DIR__ . '/../../Config/MailConfiguration.php');

Then you can make the file you're passing in conditional on the current environment.

How to create a global configuration file in php

define() is quite a good way of doing things. An alternative is to define a global array. such as

$config['something_else']='a value';
function doSomething() {
global $config;
if ($config['display_ad']) echo 'Ad code goes here';

The latter way is what many projects use, such as phpmyadmin, the reason could be, that you cannot define() a non-scalar value, e.g. define('SOME_ARRAY',array('a','b')) is invalid.

creating configuration file in php

i have done it by making an array

    $config = array (
"{b0ff543d-d294-42c8-83eb-d72161ec6771}" => '/var/www/youngib/rahul/'



Creating new Apache config file from PHP

Ok, this is a really bad plan for this, but somehow this is the best solution for this.

To do this in a proper way, I'll use the bash script, and I'll call that script from PHP.

    $output = shell_exec("sudo /path/to/script/ $SiteName $Domain");

    #! /bin/bash

#First parameter given by calling the script

#Second parameter given by calling the script

#Directorium where are stored files of the web app

#Creating a new directorium
mkdir $dirlocation

#Copying the defoult files of app to the just created dir
cp -R /var/www/someapp/* $dirlocation

#Creating the new configurationg file for Apache and VHost
cat > "${vhost_script}" << EOF
<VirtualHost *:80>
ServerName $domain
DocumentRoot $dirlocation

<Directory $dirlocation>
Options Indexes FollowSymLinks
AllowOverride All
Require all granted

#Enabling the site in Apache
a2ensite $sitename.conf

#Reloading the Apache
systemctl reload apache2.service

Also in order to do this from a PHP, I need to give www-data permission for running only that script with sudo.
To do so open the sudoers file (sudo visudo /etc/sudoers) and add the following line

www-data ALL=(root) NOPASSWD: /path/to/script/

I know this is maybe not the best solution, but this is what I've found for this purpose.

Disclaimer: This is only a showcase of how to do this, also the bash script here is a really simple one.

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