Adding more echo examples per errata.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@44014 c90b9560-bf6c-de11-be94-00142212c4b1

functions/strings.xml

@@ -489,10 +489,12 @@ $new_string = chunk_split (base64_encode($data));
     <para>
      <function>Echo</function> is not actually a function (it is a
      language construct) so you are not required to use parantheses
-     with it.  
+     with it. In fact, if you want to pass more than one parameter
+     to echo, you must not enclose the parameters within parentheses.
      <example>
-      <title><function>Echo</function> example</title>
+      <title><function>Echo</function> examples</title>
       <programlisting role="php">
+&lt;?php
 echo "Hello World";
 
 echo "This spans
@@ -500,15 +502,41 @@ multiple lines. The newlines will be
 output as well";
 
 echo "This spans\nmultiple lines. The newlines will be\noutput as well.";
+
+echo "escaping characters is done \"Like this\"."
+
+//You can use variables inside of an echo statement
+$foo = "foobar";
+$bar = "barbaz";
+
+echo "foo is $foo"; // foo is foobar
+
+// Using single quotes will print the variable name, not the value
+echo 'foo is $foo'; // foo is $foo
+
+// If you are not using any other characters, you can just echo variables
+echo $foo;          // foobar
+echo $foo,$bar;     // foobarbarbaz
+
+// because echo is not a function, following code is invalid. 
+($some_var) ? echo('true'): echo('false');
+
+// However, the following examples will work:
+($some_var) ? print('true'): print('false'); // print is a function
+echo ($some_var) ? 'true': 'false'; // changing the statement around
+?>
       </programlisting>
      </example>
+    </para>
+    <para>
+     <function>Echo</function> also has a shortcut syntax, where you
+     can immediately follow the opening tag with an equals sign.
+     <informalexample>
+      <programlisting role="php">
+I have &lt;?=$foo?> foo.
+      </programlisting>
+     </informalexample>
     </para>	 
-    <note>
-     <para>
-      In fact, if you want to pass more than one parameter to echo,
-      you must not enclose the parameters within parentheses.
-     </para>
-    </note>
     <simpara>
      See also:
      <function>print</function>,