php-doc-en/reference/zlib/functions/gztell.xml

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  <refentry id="function.gztell">
   <refnamediv>
    <refname>gztell</refname>
    <refpurpose>Tell gz-file pointer read/write position</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>gztell</methodname>
      <methodparam><type>resource</type><parameter>zp</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns the position of the file pointer referenced by
     <parameter>zp</parameter>; i.e., its offset into the file
     stream.
    </para>
    <para>
     If an error occurs, returns &false;.
    </para>
    <para>
     The file pointer must be valid, and must point to a file
     successfully opened by <function>gzopen</function>.
    </para>
    <para> 
     See also <function>gzopen</function>, <function>gzseek</function>
     and <function>gzrewind</function>.
    </para>
   </refsect1>
  </refentry>

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