Server Management

Install Composer PHP 8.3 in IONOS Shared Hosting Linux

By Admin • January 28, 2026

Running modern PHP applications on IONOS Shared Hosting often requires Composer. By default, the system might point to an older PHP version. This guide walks you through setting up PHP 8.3 and Composer correctly using a unified automated script.

Step 1 Create the script file

Log in to your server via SSH and run this command to create a new shell script file:

Terminal 
nano composer.sh

Step 2 Paste the Installation Script

Copy the following code and paste it into the editor. This script handles the download, verification, and alias creation automatically.

BASH SCRIPT 
#!/bin/bash

# 1. Install Composer using PHP 8.3
cd ~
echo "Installing Composer..."
curl -sS https://getcomposer.org/installer | /usr/bin/php8.3-cli

# 2. Run Composer to test it works
echo "Testing Composer..."
/usr/bin/php8.3-cli composer.phar --version

# 3. Create aliases in .bashrc
echo "Adding aliases to .bashrc..."
if ! grep -q "alias php='/usr/bin/php8.3-cli'" ~/.bashrc; then
    echo "" >> ~/.bashrc
    echo "# Custom PHP 8.3 Aliases" >> ~/.bashrc
    echo "alias php='/usr/bin/php8.3-cli'" >> ~/.bashrc
    echo "alias composer='/usr/bin/php8.3-cli ~/composer.phar'" >> ~/.bashrc
    echo "Aliases added."
else
    echo "Aliases already exist in .bashrc."
fi

# 4. Source and Test
shopt -s expand_aliases
source ~/.bashrc
echo "--------------------------------------------------"
echo "Testing php -v inside this script:"
php -v
echo "--------------------------------------------------"

Step 3 Run the Installation

Save the file (Ctrl+O, Enter) and exit (Ctrl+X). Then, make the script executable and run it:

Terminal 
chmod +x composer.sh
./composer.sh
✅

Success!

Composer is now installed and ready to use.

⚠️ Important IONOS Notes

  • IONOS requires explicit paths. Always use /usr/bin/php8.3-cli instead of just php unless aliases are active.
  • It uses composer.phar located in your home directory instead of a global bin.
  • If the command isn't recognized immediately, refresh your session with:
source ~/.bashrc
Added by Admin2026
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