php-doc-en/reference/misc/functions/show-source.xml

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  <refentry id="function.show-source">
   <refnamediv>
    <refname>show_source</refname>
    <refpurpose>Syntax highlighting of a file</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>show_source</methodname>
      <methodparam><type>string</type><parameter>filename</parameter></methodparam>
      <methodparam
      choice="opt"><type>bool</type><parameter>return</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     The <function>show_source</function> function prints out a syntax
     higlighted version of the code contained in <parameter>filename</parameter> 
     using the colors defined in the built-in syntax highlighter for PHP.
    </simpara>
    <simpara>
     If the second parameter <parameter>return</parameter> is set to &true;
     then <function>show_source</function> will return the highlighted
     code as a string instead of printing it out. If the second parameter is
     not set to &true; then <function>show_source</function> will
     return &true; on success, &false; on failure.
    </simpara>
    <note>
     <simpara>
      The <parameter>return</parameter> parameter became available in PHP 
      4.2.0.  Before this time it behaved like the default, which is &false;
     </simpara>
    </note>
   <simpara>
     This function is an alias for the function
     <function>highlight_file</function>
    </simpara>
    <note>
     <simpara>
      Care should be taken when using the
      <function>show_source</function> and
      <function>highlight_file</function> functions to make sure that
      you do not inadvertently reveal sensitive information such as
      passwords or any other type of information that might create a
      potential security risk.
     </simpara>
    </note>
    <simpara>
     See also <function>highlight_string</function>,
     <function>highlight_file</function>.
    </simpara>
   </refsect1>
  </refentry>

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