bool -> boolean, and added an example

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@117356 c90b9560-bf6c-de11-be94-00142212c4b1

reference/var/functions/is-bool.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <!-- splitted from ./en/functions/var.xml, last change in rev 1.19 -->
   <refentry id="function.is-bool">
    <refnamediv>
@@ -16,7 +16,30 @@
      </methodsynopsis>
      <para>
       Returns &true; if the <parameter>var</parameter> parameter is
-      a <type>bool</type>.
+      a <type>boolean</type>.
+     </para>
+     <para>
+      <example>
+      <title><function>is_bool</function> examples</title>
+      <programlisting role="php">
+<![CDATA[
+<?php
+$a = false;
+$b = 0;
+
+// Since $a is a boolean, this is true
+if (is_bool($a)) {
+    print "Yes, this is a boolean";
+}
+
+// Since $b is not a boolean, this is not true
+if (is_bool($b)) {
+    print "Yes, this is a boolean";
+}
+?>
+]]>
+       </programlisting>
+      </example>
      </para>
      <para>
      See also