php-doc-en/reference/filesystem/functions/fwrite.xml

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  <refentry id="function.fwrite">
   <refnamediv>
    <refname>fwrite</refname>
    <refpurpose>Binary-safe file write</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>int</type><methodname>fwrite</methodname>
      <methodparam><type>int</type><parameter>fp</parameter></methodparam>
      <methodparam><type>string</type><parameter>string</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>length</parameter></methodparam>
     </methodsynopsis>
    <simpara>
     <function>fwrite</function> writes the contents of
     <parameter>string</parameter> to the file stream pointed to by
     <parameter>fp</parameter>. If the <parameter>length</parameter>
     argument is given, writing will stop after
     <parameter>length</parameter> bytes have been written or the end
     of <parameter>string</parameter> is reached, whichever comes
     first.
    </simpara>
    <simpara>
     <function>fwrite</function> returns the number of bytes
     written, or -1 on error.
    </simpara>
    <simpara>
     Note that if the <parameter>length</parameter> argument is given,
     then the <link
     linkend="ini.magic-quotes-runtime">magic_quotes_runtime</link>
     configuration option will be ignored and no slashes will be
     stripped from <parameter>string</parameter>.
    </simpara>
    <note>
     <para>
      On systems which differentiate between binary and text files 
      (i.e. Windows) the file must be opened with 'b' included in
      <function>fopen</function> mode parameter.
     </para>
    </note>
    <simpara>
     See also <function>fread</function>, <function>fopen</function>,
     <function>fsockopen</function>, <function>popen</function>, and
     <function>fputs</function>.
    </simpara>
   </refsect1>
  </refentry>

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