Missing functions after installing php from source code

The source code lacks functions after installing php

With the popularity of the Internet, PHP has become one of the most important server scripting languages. Most traditional PHP versions are installed through Linux package managers (such as yum, apt-get, etc.). In short, it is very convenient. However, for users who need to customize specific functions, they may choose to install the PHP version from source. Although source code installation has great advantages in handling some requirements, it also has some potential problems, such as missing some features.

The main purpose of this article is to discuss how to solve the problem of PHP missing functions after installing the PHP version from the source code. I'm going to describe some of the problems and solutions I've experienced in the hopes of helping those who are installing PHP from source.

1. The necessary libraries are not installed

One of the most common problems for users who install PHP from source is that the necessary libraries are not installed. Because when compiling PHP, you may need to use many different libraries, which are usually provided by the operating system. If you try to install PHP from source and encounter errors during compilation, you should first check whether your system has these libraries installed.

You can check whether your system has the necessary libraries installed by running the following command:

sudo apt-get install libxml2-dev
sudo apt-get install libpng-dev
sudo apt-get install libjpeg-dev

If you need other libraries when compiling PHP, please check the PHP official documentation, or run the following Command to see if you have these libraries installed:

sudo apt-get install libcurl4-openssl-dev
sudo apt-get install libzip-dev

2. Required modules are not enabled

In addition to libraries, running PHP scripts also requires some modules to be enabled, if If these modules are not enabled correctly, functionality will be missing. PHP has many modules that you can enable when compiling PHP. For example, if you want to use a MySQL database, then you need to enable the mysql module.

The following are the names and enabling methods of some commonly used modules:

• mysqli：./configure --with-mysqli=mysqlnd
• openssl：./configure - -with-openssl
• soap：./configure --enable-soap
• xmlrpc：./configure --with-xmlrpc

If you need to enable other modules, please check the official PHP documentation, or run the following command to get information about the modules available on your system:

php -m

3. No PHP functions enabled

Except for modules , many functions can also be used in PHP scripts. Some functions may be turned off by default when PHP is compiled, so if you find that certain functions are missing when running a PHP script, you may need to recompile PHP and enable these functions.

Here are the names of some functions that may need to be enabled manually:

• curl_exec()
• file_get_contents()
• exec()

If you find that these functions are not enabled, you can try editing the php.ini file, find the lines about these functions and remove the semicolon (;).

4. Missing add-ons

PHP also provides some additional components that are not usually installed with PHP. These components may include image processing libraries (such as GD or ImageMagick) and PDF generation libraries (such as dompdf or TCPDF), etc. If you are missing these components, then you will not be able to perform operations related to these components.

If you are sure that these components do not exist on your system or need to be updated, you can use the following command to install them:

sudo apt-get install imagemagick
sudo apt-get install php-gd
sudo apt-get install php-imagick
sudo apt-get install php-dompdf

In short, many problems may occur after installing the PHP version from source. In this article, I discuss some of the issues with missing functionality and provide some solutions. If you quickly solve the problem of PHP missing features, then you can more easily install PHP from source.

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