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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="closure.bind" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>Closure::bind</refname>
<refpurpose>
Duplicates a closure with a specific bound object and class scope
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis role="Closure">
<modifier>public</modifier> <modifier>static</modifier> <type class="union"><type>Closure</type><type>null</type></type><methodname>Closure::bind</methodname>
<methodparam><type>Closure</type><parameter>closure</parameter></methodparam>
<methodparam><type class="union"><type>object</type><type>null</type></type><parameter>newThis</parameter></methodparam>
<methodparam choice="opt"><type class="union"><type>object</type><type>string</type><type>null</type></type><parameter>newScope</parameter><initializer>"static"</initializer></methodparam>
</methodsynopsis>
<para>
This method is a static version of <methodname>Closure::bindTo</methodname>.
See the documentation of that method for more information.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>closure</parameter></term>
<listitem>
<para>
The anonymous functions to bind.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>newThis</parameter></term>
<listitem>
<para>
The object to which the given anonymous function should be bound, or
&null; for the closure to be unbound.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>newScope</parameter></term>
<listitem>
<para>
The class scope to which the closure is to be associated, or
'static' to keep the current one. If an object is given, the type of the
object will be used instead. This determines the visibility of protected
and private methods of the bound object.
It is not allowed to pass (an object of) an internal class as this parameter.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns a new <classname>Closure</classname> object, or &null; on failure.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<example>
<title><function>Closure::bind</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
class A {
private static $sfoo = 1;
private $ifoo = 2;
}
$cl1 = static function() {
return A::$sfoo;
};
$cl2 = function() {
return $this->ifoo;
};
$bcl1 = Closure::bind($cl1, null, 'A');
$bcl2 = Closure::bind($cl2, new A(), 'A');
echo $bcl1(), "\n";
echo $bcl2(), "\n";
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
1
2
]]>
</screen>
</example>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<simplelist>
<member><link linkend="functions.anonymous">Anonymous functions</link></member>
<member><methodname>Closure::bindTo</methodname></member>
</simplelist>
</refsect1>
</refentry>
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