Eclipse：“ PHP致命错误：调用未定义函数mysqli_connect（）”

Question

I have a php script (machine_db.php) which makes a connection to mysql database as follows:

<?php
//phpinfo();
// 1    connect to mysql
$servername = "localhost";
$username = "root";
$password = "abcd";
$conn = mysqli_connect($servername, $username, $password);
...
?>

I am using:

• Server version: Apache/2.4.12 (Ubuntu)
• PHP 5.6.11
• mysql Ver 14.14 Distrib 5.6.28

I am using Eclipse Mars and I installed PHP packages (addin or whatever it is called) for Eclipse. Then I created a php project and added my php file to the project and did run as php cli application but I get the following error in Eclipse console,

PHP Fatal error:  Call to undefined function mysqli_connect()   

However I don't get any error when I run the exact same script from terminal like:

php machine_db.php

I also see that in my Eclipse project explorer there is a PHP Language Library which contains mysqli class.

Answer 1

I think you forget the db name:

$servername = "localhost";
$username = "root";
$password = "abcd";
$db_name = "my-db";
$conn = mysqli_connect($servername, $username, $password, $db_name);

You can also use

$conn = new mysqli($servername, $username, $password, $db_name);

Documentation: http://php.net/manual/fr/mysqli.construct.php

---

Also try to install php5-mysqli

sudo apt-get update
sudo apt-get install php5-mysql php5-mysqli
sudo service apache2 restart

---

dont forget to uncomment this line in your /etc/php5/apache2/php.ini

extension=php_mysql.so
extension=php_mysqli.so

Dont forget to restart apache server

  sudo service apache2 restart

Answer 2

I just realized that if in eclipse i check " use system default php.ini " under window->preferences->php->phpexecutables it will magically work.

Does anyone know what is "system default php.ini"?

I do aa quick $php --ini and it returns:

Configuration File (php.ini) Path: /etc/php5/cli
Loaded Configuration File:         /etc/php5/cli/php.ini
Scan for additional .ini files in: /etc/php5/cli/conf.d
Additional .ini files parsed:      /etc/php5/cli/conf.d/05-opcache.ini,
/etc/php5/cli/conf.d/10-mysqlnd.ini,
/etc/php5/cli/conf.d/10-pdo.ini,
/etc/php5/cli/conf.d/20-json.ini,
/etc/php5/cli/conf.d/20-mysql.ini,
/etc/php5/cli/conf.d/20-mysqli.ini,
/etc/php5/cli/conf.d/20-pdo_mysql.ini,
/etc/php5/cli/conf.d/20-readline.ini