What should I do if the Raspberry Pi cannot install php5?

Installing web server and PHP on Raspberry Pi has always been very convenient, but with the upgrade of operating system and software version update, some users have encountered problems when installing PHP5. This article will introduce how to install PHP5 on Raspberry Pi, as well as solutions to problems.

1. Confirm operating system version

Before installing PHP5, please make sure your Raspberry Pi system version is Raspbian "Jessie" (Debian 8). Because in the "Jessie" operating system version, PHP5.6 is integrated by default. If your Raspberry Pi system version is Raspbian "Stretch" (Debian 9), the default installation is PHP7, which does not include PHP5.6. You need to manually add the software source and install it.

2. Install PHP5

In Raspbian "Jessie", installing PHP5 is very simple, just enter the following command in the terminal:

sudo apt-get update
sudo apt-get install php5 libapache2-mod-php5

The above command will install PHP5 and Apache2 web server. Once the installation is complete, you can test that PHP is installed correctly by entering the following command in the terminal:

sudo nano /var/www/html/info.php

In a text editor, enter the following:

<?php phpinfo();
?>

Save and exit the text editor Finally, access your PHP information through the following URL:

http://localhost/info.php

If you see the PHP information interface, it means that PHP has been installed correctly.

3. Solution to problems encountered when installing PHP5

If you encounter the following error when installing PHP5:

E: Package 'php5' has no installation candidate

or:

E: Unable to locate package php5

It is most likely that your software source is not configured correctly, causing the php5 software package to be unable to be found. At this point you can try to update and reconfigure the software source:

sudo apt-get update
sudo apt-get install lsb-release
sudo apt-get install ca-certificates
sudo wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/php.list
sudo apt-get update
sudo apt-get install php5 libapache2-mod-php5

The above command will update your software source and add a new php repository. If everything goes well, you will be able to successfully install PHP5.

Summary

In Raspbian "Jessie", installing PHP5 is a very simple process. But if your Raspberry Pi operating system version is Raspbian "Stretch", you need to manually add the software source and perform some additional configuration to successfully install PHP5. Whether you encounter problems or successfully installed PHP5, I hope this article will be helpful to you.

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