php-doc-en/reference/strings/functions/htmlentities.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.htmlentities">
 <refnamediv>
  <refname>htmlentities</refname>
  <refpurpose>Convert all applicable characters to HTML entities</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>string</type><methodname>htmlentities</methodname>
   <methodparam><type>string</type><parameter>string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>quote_style</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter>charset</parameter></methodparam>
   <methodparam choice="opt"><type>bool</type><parameter>double_encode</parameter></methodparam>
  </methodsynopsis>
  <para>
   This function is identical to <function>htmlspecialchars</function> in all
   ways, except with <function>htmlentities</function>, all characters which
   have HTML character entity equivalents are translated into these entities.
  </para>
  <para>
   If you're wanting to decode instead (the reverse) you can use
   <function>html_entity_decode</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>string</parameter></term>
     <listitem>
      <para>
       The input string.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>quote_style</parameter></term>
     <listitem>
      <para>
       Like <function>htmlspecialchars</function>, the optional second
       <parameter>quote_style</parameter> parameter lets you define what will
       be done with 'single' and "double" quotes.  It takes on one of three
       constants with the default being <constant>ENT_COMPAT</constant>:
       <table>
        <title>Available <parameter>quote_style</parameter> constants</title>
        <tgroup cols="2">
         <thead>
          <row>
           <entry>Constant Name</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry><constant>ENT_COMPAT</constant></entry>
           <entry>Will convert double-quotes and leave single-quotes alone.</entry>
          </row>
          <row>
           <entry><constant>ENT_QUOTES</constant></entry>
           <entry>Will convert both double and single quotes.</entry>
          </row>
          <row>
           <entry><constant>ENT_NOQUOTES</constant></entry>
           <entry>Will leave both double and single quotes unconverted.</entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>charset</parameter></term>
     <listitem>
      <para>
       Like <function>htmlspecialchars</function>, it takes an optional
       third argument <parameter>charset</parameter> which defines character
       set used in conversion.
       Presently, the ISO-8859-1 character set is used as the default.
      </para>
      &reference.strings.charsets;
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>double_encode</parameter></term>
     <listitem>
      <para>
       When <parameter>double_encode</parameter> is turned off PHP will not
       encode existing html entities. The default is to convert everything.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

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

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.2.3</entry>
       <entry>
        The <parameter>double_encode</parameter> parameter was added.
       </entry>
      </row>
      <row>
       <entry>4.1.0</entry>
       <entry>
        The <parameter>charset</parameter> parameter was added.
       </entry>
      </row>
      <row>
       <entry>4.0.3</entry>
       <entry>
        The <parameter>quote_style</parameter> parameter was added.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>htmlentities</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$str = "A 'quote' is <b>bold</b>";

// Outputs: A 'quote' is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str);

// Outputs: A &#039;quote&#039; is &lt;b&gt;bold&lt;/b&gt;
echo htmlentities($str, ENT_QUOTES);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>html_entity_decode</function></member>
    <member><function>get_html_translation_table</function></member>
    <member><function>htmlspecialchars</function></member>
    <member><function>nl2br</function></member>
    <member><function>urlencode</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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