Call to undefined function mysqli_connect()

Question

In this code must be an error due to empty arguments in the mysqli_connect function. But browser display different error. As I know mysqli_connect function installed by default. Where is the problem or my mistake? How I can fix it?

Dockerfile

FROM php:fpm

# Update system core
RUN apt update -y && apt upgrade -y

# Start PHP-FPM
CMD ["php-fpm"]

index.php

<?php mysqli_connect('', '', '', '', '', ''); ?>

Error in browser:

Fatal error: Uncaught Error: Call to undefined function mysqli_connect() in /var/www/index.php:3 Stack trace: #0 {main} thrown in /var/www/index.php on line 3

@LexXy You need to get in the habit of [accepting answers](http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work) which help you to solve your issues. You'll earn points and others will be encouraged to help you. — Jay Blanchard, Feb 26 '20 at 14:18

Jay Blanchard · Answer 1 · 2020-02-26T14:22:02.433

6

In your Dockerfile for PHP-FPM (I recommend the Alpine version) you have to install MySQLi extension separately

FROM php:7-fpm-alpine

# Update system core
RUN apt update -y && apt upgrade -y
RUN docker-php-ext-install mysqli && docker-php-ext-enable mysqli

# Start PHP-FPM
CMD ["php-fpm"]

edited Feb 26 '20 at 14:22

answered Feb 26 '20 at 14:11

Jay Blanchard

34,243
16
77
119

I have an error: ERROR: Dockerfile parse error line 5: unknown instruction: DOCKER-PHP-EXT-INSTALL – LeXxyIT Feb 26 '20 at 14:20
@LexXy I made a typo, see the updated answer - added the `RUN` I also added the enable command after I tested. – Jay Blanchard Feb 26 '20 at 14:22
I did. Try removing that line and re-running. It may not be necessary. – Jay Blanchard Feb 26 '20 at 14:43

Dmitry Leiko · Accepted Answer · 2020-02-26T14:38:35.357

1

In Dockerfile you need add mysqli extension:

FROM php:7.3-fpm

# Update system core

RUN apt update && apt install -y \
        libfreetype6-dev \
        libjpeg62-turbo-dev \
        libpng-dev libxml2-dev libcurl4-gnutls-dev


RUN docker-php-ext-install -j$(nproc) mysqli \
    && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ \
    && docker-php-ext-install -j$(nproc) gd

# Start PHP-FPM
CMD ["php-fpm"]

edited Feb 26 '20 at 14:38

answered Feb 26 '20 at 14:23

Dmitry Leiko

3,970
3
25
42

2

Please reduce your answer to the relevant parts - there is no need to install a ton of other extensions if only a MySQL connector is needed – Nico Haase Feb 26 '20 at 14:28
I have this error: ERROR: Service 'php-fpm' failed to build: The command '/bin/sh -c apt update && apt install -y libfreetype6-dev libjpeg62-turbo-dev libpng-dev libxml2-dev libcurl4-gnutls-dev' returned a non-zero code: 127 – LeXxyIT Feb 26 '20 at 14:37

Call to undefined function mysqli_connect()

2 Answers2