php - 调用未定义的函数mysqli_connect()

Question

由于mysqli_connect函数中的参数为空，因此此代码中必须是错误。但是浏览器显示不同的错误。据我所知mysqli_connect函数默认安装。问题或我的错误在哪里？我该如何解决？

Docker文件

FROM php:fpm

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

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

index.php

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

浏览器错误:

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

Answer 1

在Dockerfile中，您需要添加mysqli扩展名:

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"]