<h3 id="heading-1-update-ubuntu">[1] Update Ubuntu</h3>
<pre><code class="lang-plaintext">sudo apt update
</code></pre>
<h3 id="heading-2-install-php-cli">[2] Install PHP CLI</h3>
<pre><code class="lang-plaintext">sudo apt install php-cli unzip
</code></pre>
<h3 id="heading-3-install-composer">[3] Install Composer</h3>
<p>Change directory to home.</p>
<p>Install Composer</p>
<pre><code class="lang-plaintext">cd ~
curl -sS https://getcomposer.org/installer -o /tmp/composer-setup.php
</code></pre>
<p>Using <code>curl</code>, fetch the latest signature and store it in a shell variable:</p>
<pre><code class="lang-plaintext">HASH=`curl -sS https://composer.github.io/installer.sig`
</code></pre>
<p>Verify that the installation script is safe to run:</p>
<pre><code class="lang-plaintext">php -r "if (hash_file('SHA384', '/tmp/composer-setup.php') === '$HASH') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
</code></pre>
<p>Outcome:</p>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1692268422223/27b681d8-7ad3-446d-9abe-2358004e128a.png" alt class="image--center mx-auto" /></p>
<p>Download and install Composer as a system-wide command named composer, under /usr/local/bin:</p>
<pre><code class="lang-plaintext">sudo php /tmp/composer-setup.php --install-dir=/usr/local/bin --filename=composer
</code></pre>
<p>Outcome:</p>
<p><img src="https://cdn.hashnode.com/res/hashnode/image/upload/v1692268337881/a06aa22a-fd70-4d92-a541-812a94e92d74.png" alt class="image--center mx-auto" /></p>


### \[1\] Update Ubuntu

```plaintext
sudo apt update
```

### \[2\] Install PHP CLI

```plaintext
sudo apt install php-cli unzip
```

### \[3\] Install Composer

Change directory to home.

Install Composer

```plaintext
cd ~
curl -sS https://getcomposer.org/installer -o /tmp/composer-setup.php
```

Using `curl`, fetch the latest signature and store it in a shell variable:

```plaintext
HASH=`curl -sS https://composer.github.io/installer.sig`
```

Verify that the installation script is safe to run:

```plaintext
php -r "if (hash_file('SHA384', '/tmp/composer-setup.php') === '$HASH') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
```

Outcome:

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1692268422223/27b681d8-7ad3-446d-9abe-2358004e128a.png align="center")

Download and install Composer as a system-wide command named composer, under /usr/local/bin:

```plaintext
sudo php /tmp/composer-setup.php --install-dir=/usr/local/bin --filename=composer
```

Outcome:

![](https://cdn.hashnode.com/res/hashnode/image/upload/v1692268337881/a06aa22a-fd70-4d92-a541-812a94e92d74.png align="center")

Ubuntu - Install PHP and Composer

[1] Update Ubuntu

[2] Install PHP CLI

[3] Install Composer