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		<title>PHP/Functions/function exists - История изменений</title>
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		<updated>2026-04-04T07:20:16Z</updated>
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		<id>http://wbex.ru/index.php?title=PHP/Functions/function_exists&amp;diff=690&amp;oldid=prev</id>
		<title> в 10:37, 26 мая 2010</title>
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				<updated>2010-05-26T10:37:28Z</updated>
		
		<summary type="html">&lt;p&gt;&lt;/p&gt;
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				&lt;td colspan=&quot;1&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Версия 10:37, 26 мая 2010&lt;/td&gt;
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	<entry>
		<id>http://wbex.ru/index.php?title=PHP/Functions/function_exists&amp;diff=691&amp;oldid=prev</id>
		<title>Admin: 1 версия</title>
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				<updated>2010-05-26T07:04:58Z</updated>
		
		<summary type="html">&lt;p&gt;1 версия&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Новая страница&lt;/b&gt;&lt;/p&gt;&lt;div&gt;==bool function_exists ( string function_name ) returns true if that function is available for use.==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
   &lt;br /&gt;
  &amp;lt;!-- start source code --&amp;gt;&lt;br /&gt;
   &lt;br /&gt;
    &amp;lt;source lang=&amp;quot;html4strict&amp;quot;&amp;gt;&lt;br /&gt;
 &lt;br /&gt;
&amp;lt;?&lt;br /&gt;
    if (function_exists(&amp;quot;imagepng&amp;quot;)) {&lt;br /&gt;
            echo &amp;quot;You have the GD extension loaded.&amp;quot;;&lt;br /&gt;
    } else {&lt;br /&gt;
            echo &amp;quot;Can&amp;quot;t find imagepng( ) - do you have GD loaded?&amp;quot;;&lt;br /&gt;
    }&lt;br /&gt;
?&amp;gt;&lt;br /&gt;
  &lt;br /&gt;
  &amp;lt;/source&amp;gt;&lt;br /&gt;
    &lt;br /&gt;
   &lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
==Testing for a Function&amp;quot;s Existence==&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
   &lt;br /&gt;
  &amp;lt;!-- start source code --&amp;gt;&lt;br /&gt;
   &lt;br /&gt;
    &amp;lt;source lang=&amp;quot;html4strict&amp;quot;&amp;gt;&lt;br /&gt;
 &lt;br /&gt;
&amp;lt;html&amp;gt;&lt;br /&gt;
&amp;lt;body&amp;gt;&lt;br /&gt;
&amp;lt;div&amp;gt;&lt;br /&gt;
&amp;lt;?php&lt;br /&gt;
    function tagWrap( $tag, $txt, $func=&amp;quot;&amp;quot; ) {&lt;br /&gt;
      if ( function_exists( $func ) )&lt;br /&gt;
        $txt = $func( $txt );&lt;br /&gt;
      return &amp;quot;&amp;lt;$tag&amp;gt;$txt&amp;lt;/$tag&amp;gt;\n&amp;quot;;&lt;br /&gt;
    }&lt;br /&gt;
    &lt;br /&gt;
    function subscript( $txt ) {&lt;br /&gt;
      return &amp;quot;&amp;lt;sub&amp;gt;$txt&amp;lt;/sub&amp;gt;&amp;quot;;&lt;br /&gt;
    }&lt;br /&gt;
    &lt;br /&gt;
    print tagWrap(&amp;quot;b&amp;quot;, &amp;quot;bold&amp;quot;);&lt;br /&gt;
    &lt;br /&gt;
    print tagWrap(&amp;quot;i&amp;quot;, &amp;quot;i&amp;quot;, &amp;quot;subscript&amp;quot;);&lt;br /&gt;
   &lt;br /&gt;
?&amp;gt;&lt;br /&gt;
&amp;lt;/div&amp;gt;&lt;br /&gt;
&amp;lt;/body&amp;gt;&lt;br /&gt;
&amp;lt;/html&amp;gt;&lt;br /&gt;
  &lt;br /&gt;
  &amp;lt;/source&amp;gt;&lt;/div&gt;</summary>
		<author><name>Admin</name></author>	</entry>

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