Reworded how typing works and rewrote example to help show it.

Fixed bug #45207 (Incorrect or missing documentation for languages.variables)


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@267083 c90b9560-bf6c-de11-be94-00142212c4b1

language/variables.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.103 $ -->
+<!-- $Revision: 1.104 $ -->
  <chapter xml:id="language.variables" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Variables</title>
   
@@ -121,8 +121,9 @@ $bar = &test();    // Invalid.
    
    <para>
     It is not necessary to initialize variables in PHP however it is a very
-    good practice. Uninitialized variables have a default value of their type
-    - &false;, zero, empty string or an empty array.
+    good practice. Uninitialized variables have a default value of their type depending on the context in which they are used
+    - booleans default to &false;, integers and floats default to zero, strings (e.g. used in <function>echo</function>) are 
+    set as an empty string and arrays become to an empty array.
    </para>
    <para>
     <example>
@@ -130,10 +131,32 @@ $bar = &test();    // Invalid.
      <programlisting role="php">
 <![CDATA[
 <?php
-echo ($unset_bool ? "true" : "false"); // false
+// Unset AND unreferenced (no use context) variable; outputs NULL
+var_dump($unset_var);
+
+// Boolean usage; outputs 'false' (See ternary operators for more on this syntax)
+echo($unset_bool ? "true\n" : "false\n");
+
+// String usage; outputs 'string(3) "abc"'
+$unset_str .= 'abc';
+var_dump($unset_str);
+
+// Integer usage; outputs 'int(25)'
 $unset_int += 25; // 0 + 25 => 25
-echo $unset_string . "abc"; // "" . "abc" => "abc"
-$unset_array[3] = "def"; // array() + array(3 => "def") => array(3 => "def")
+var_dump($unset_int);
+
+// Float/double usage; outputs 'float(1.25)'
+$unset_float += 1.25;
+var_dump($unset_float);
+
+// Array usage; outputs array(1) {  [3]=>  string(3) "def" }
+$unset_arr[3] = "def"; // array() + array(3 => "def") => array(3 => "def")
+var_dump($unset_arr);
+
+// Object usage; creates new stdClass object (see http://www.php.net/manual/en/reserved.classes.php)
+// Outputs: object(stdClass)#1 (1) {  ["foo"]=>  string(3) "bar" }
+$unset_obj->foo = 'bar';
+var_dump($unset_obj);
 ?>
 ]]>
      </programlisting>