Updates build instructions and example

Author: Michael Herold

README.md

@@ -1,40 +1,68 @@
 php-systemd
-============
+===========
 
 PHP extension allowing native interaction with systemd and journald
 
 Installation
-============
+------------
+
+### Prerequisites
+
+.deb based
 
-    sudo dnf install php-devel systemd-devel
     sudo apt install php5-dev  libsystemd-dev
 
+.rpm based
+
+    sudo dnf install php-devel systemd-devel
+
+### Build
+
     phpize
     ./configure --with-systemd
     make
+
+### Setup
+
     sudo make install
+
+Fedora
+
     echo "extension=systemd.so" | sudo tee /etc/php.d/systemd.ini
+
+Debian (PHP 5)
+
+    echo "extension=systemd.so" | sudo tee /etc/php5/mods-available/systemd.ini
+    sudo php5enmod systemd
+
+### Basic Test
+
     echo "<?php echo sd_journal_send('MESSAGE=hello world');" | php
-    
+
 Usage
-=====
+-----
 
 Quick example:
 
-    <?php
-    sd_journal_send('MESSAGE=Hello world.');
-    sd_journal_send('MESSAGE=Hello, again, world.', 'FIELD2=Greetings!', 'FIELD3=Guten tag.');
-    sd_journal_send('ARBITRARY=anything', 'FIELD3=Greetings!');
+``` {.php}
+<?php
+sd_journal_send('MESSAGE=Hello world.');
+sd_journal_send('MESSAGE=Hello, again, world.', 'FIELD2=Greetings!', 'FIELD3=Guten tag.');
+sd_journal_send('ARBITRARY=anything', 'FIELD3=Greetings!');
+```
 
 Notes:
 
- * Each argument must be in the form of a KEY=value pair, environmental variable style.
- * Unlike the native C version of journald's sd_journal_send(), printf-style substitution is not supported. Perform any substitution using PHP's sprintf() or similar capabilities first.
- * The base message is usually sent in the form MESSAGE=hello. The MESSAGE field is, however, not required.
- * Invalid arguments result in nothing recorded in the journal.
+-   Each argument must be in the form of a KEY=value pair, environmental
+    variable style.
+-   Unlike the native C version of journald's `sd_journal_send()`,
+    printf-style substitution is not supported. Perform any substitution
+    using PHP's `sprintf()` or similar capabilities first.
+-   The base message is usually sent in the form MESSAGE=hello. The
+    MESSAGE field is, however, not required.
+-   Invalid arguments result in nothing recorded in the journal.
 
-Viewing Output
-==============
+### Viewing Output
 
 Quick way to view output with all fields as it comes in: