php-doc-en/reference/spl/splfileobject/ftruncate.xml
2009-11-19 14:54:51 +00:00

113 lines
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XML

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="splfileobject.ftruncate" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>SplFileObject::ftruncate</refname>
<refpurpose>Truncates the file to a given length</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <type>bool</type><methodname>SplFileObject::ftruncate</methodname>
<methodparam><type>int</type><parameter>size</parameter></methodparam>
</methodsynopsis>
<para>
Truncates the file to <parameter>size</parameter> bytes.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>size</parameter></term>
<listitem>
<para>
The size to truncate to.
</para>
<note>
<para>
If <parameter>size</parameter> is larger than the file it is extended with null bytes.
</para>
<para>
If <parameter>size</parameter> is smaller than the file, the extra data will be lost.
</para>
</note>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.success;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><methodname>SplFileObject::ftruncate</methodname> example</title>
<programlisting role="php">
<![CDATA[
<?php
// Create file containing "Hello World!"
$file = new SplFileObject("/tmp/ftruncate", "w+");
$file->fwrite("Hello World!");
// Truncate to 5 bytes
$file->ftruncate(5);
// Rewind and read data
$file->rewind();
echo $file->fgets();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Hello
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>ftruncate</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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