php-doc-en/reference/runkit/functions/runkit-sandbox-output-handler.xml

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<refentry id="function.runkit-sandbox-output-handler">
 <refnamediv>
  <refname>runkit_sandbox_output_handler</refname>
  <refpurpose>
   Specify a function to capture and/or process output from a runkit sandbox
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>runkit_sandbox_output_handler</methodname>
   <methodparam><type>object</type><parameter>sandbox</parameter></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>callback</parameter></methodparam>
  </methodsynopsis>
  <para>
   Ordinarily, anything output (such as with <function>echo</function>
   or <function>print</function> will be output as though it were printed
   from the parent's scope.  Using <function>runkit_sandbox_output_handler</function>
   however, output generated by the sandbox (including errors), can be captured
   by a function outside of the sandbox.
  </para>

  &note.runkit.sandbox;

 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>sandbox</parameter></term>
     <listitem>
      <para>
       Object instance of Runkit_Sandbox class on which to set output handling.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>callback</parameter></term>
     <listitem>
      <para>
       Name of a function which expects one parameter.
       Output generated by <parameter>sandbox</parameter> will be passed
       to this callback.  Anything returned by the callback will be displayed
       normally.  If this parameter is not passed then output handling will not be changed.
       If a non-truth value is passed, output handling will be disabled and will revert to
       direct display.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the name of the previously defined output handler callback, or
   &false; if no handler was previously defined.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Feeding output to a variable</title>
    <programlisting role="php">
<![CDATA[
<?php
function capture_output($str) {
  $GLOBALS['sandbox_output'] .= $str;

  return '';
}

$sandbox_output = '';

$php = new Runkit_Sandbox();
runkit_sandbox_output_handler($php, 'capture_output');
$php->echo("Hello\n");
$php->eval('var_dump("Excuse me");');
$php->die("I lost myself.");
unset($php);

echo "Sandbox complete\n\n";
echo $sandbox_output;
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Sandbox Complete

Hello
string(9) "Excuse me"
I lost myself.
]]>
    </screen>
   </example>
  </para>
 </refsect1>


</refentry>

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