Add apache.get_php_version() convenience function

rattail_fabric2/apache.py

@@ -67,6 +67,17 @@ def get_version(c):
             return float(match.group(1))
 
 
+def get_php_version(c):
+    """
+    Fetch the version of PHP running on the target system
+    """
+    result = c.sudo('php --version')
+    if not result.failed:
+        match = re.match(r'^PHP (\d+\.\d+)\.\d+-', result.stdout)
+        if match:
+            return float(match.group(1))
+
+
 def enable_mod(c, *names):
     """
     Enable the given Apache modules