tempnam.xml

<?xml version="1.0" encoding="utf-8"?>
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<refentry xml:id="function.tempnam" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>tempnam</refname>
  <refpurpose>Create file with unique file name</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>string</type><type>false</type></type><methodname>tempnam</methodname>
   <methodparam><type>string</type><parameter>directory</parameter></methodparam>
   <methodparam><type>string</type><parameter>prefix</parameter></methodparam>
  </methodsynopsis>
  <para>
   Creates a file with a unique filename, with access permission set to 0600, in the specified directory.
   If the directory does not exist or is not writable, <function>tempnam</function> may
   generate a file in the system's temporary directory, and return
   the full path to that file, including its name.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>directory</parameter></term>
     <listitem>
      <para>
       The directory where the temporary filename will be created.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>prefix</parameter></term>
     <listitem>
      <para>
       The prefix of the generated temporary filename.
      </para>
      <note>
       <simpara>
        Only the first 63 characters of the prefix are used, the rest are ignored.
        Windows uses only the first three characters of the prefix.
       </simpara>
      </note>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the new temporary filename (with path), or &false; on
   failure.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>7.1.0</entry>
      <entry>
       <function>tempnam</function> now emits a notice when falling back to the
       temp directory of the system.
      </entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>tempnam</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$tmpfname = tempnam("/tmp", "FOO");

$handle = fopen($tmpfname, "w");
fwrite($handle, "writing to tempfile");
fclose($handle);

// do something here

unlink($tmpfname);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <simpara>
    If PHP cannot create a file in the specified <parameter>directory</parameter>
    parameter, it falls back on the system default. On NTFS this also happens
    if the specified <parameter>directory</parameter> contains more than 65534 files.
   </simpara>
  </note>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>tmpfile</function></member>
    <member><function>sys_get_temp_dir</function></member>
    <member><function>unlink</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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