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<refentry xml:id="function.addslashes" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>addslashes</refname>
  <refpurpose>Quote string with slashes</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>addslashes</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
  </methodsynopsis>
  <para>
   Returns a string with backslashes added before characters that need to be
   escaped. These characters are:
   <simplelist>
    <member>single quote (<literal>'</literal>)</member>
    <member>double quote (<literal>"</literal>)</member>
    <member>backslash (<literal>\</literal>)</member>
    <member>NUL (the NUL byte)</member>
   </simplelist>
  </para>
  <para>
   A use case of <function>addslashes</function> is escaping the aforementioned
   characters in a string that is to be evaluated by PHP:
   <informalexample>
    <programlisting role="php">
<![CDATA[
<?php
$str = "O'Reilly?";
eval("echo '" . addslashes($str) . "';");
?>
]]>
    </programlisting>
   </informalexample>
  </para>
  <para>
   The <function>addslashes</function> is sometimes incorrectly used to try to prevent
   <link linkend="security.database.sql-injection">SQL Injection</link>. Instead,
   database-specific escaping functions and/or prepared statements should be used.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       The string to be escaped.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the escaped string.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>An <function>addslashes</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = "Is your name O'Reilly?";

// Outputs: Is your name O\'Reilly?
echo addslashes($str);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>stripcslashes</function></member>
    <member><function>stripslashes</function></member>
    <member><function>addcslashes</function></member>
    <member><function>htmlspecialchars</function></member>
    <member><function>quotemeta</function></member>
    <member><function>get_magic_quotes_gpc</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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