Updated PHP doc to include print_r() and var_dump()

php.html.markdown

@@ -176,6 +176,11 @@ $y = 0;
 echo $x; // => 2
 echo $z; // => 0
 
+// Dumps type and value of variable to stdout
+var_dumb($z); // prints int(3)
+
+// Prints variable to stdout in human-readable format
+print_r($array); // prints: Array ( [0] => One [1] => Two [2] => Three )
 
 /********************************
  * Logic