language/predefined/closure/bindto.xml
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2a4874ed531bcc223ca4bc1b4f9a5292594abaea
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<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="closure.bindto" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>Closure::bindTo</refname>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<modifier>public</modifier> <type>Closure</type><methodname>Closure::bindTo</methodname>
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<methodparam><type>object</type><parameter>newthis</parameter></methodparam>
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<methodparam choice="opt"><type>mixed</type><parameter>newscope</parameter>
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<initializer>"static"</initializer></methodparam>
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<methodsynopsis role="Closure">
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<modifier>public</modifier> <type class="union"><type>Closure</type><type>null</type></type><methodname>Closure::bindTo</methodname>
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<methodparam><type class="union"><type>object</type><type>null</type></type><parameter>newThis</parameter></methodparam>
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<methodparam choice="opt"><type class="union"><type>object</type><type>string</type><type>null</type></type><parameter>newScope</parameter><initializer>"static"</initializer></methodparam>
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</methodsynopsis>
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<para>
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Create and return a new <link linkend="functions.anonymous">anonymous
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which determines which private and protected members the anonymous
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function will be able to access. Namely, the members that will be
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visible are the same as if the anonymous function were a method of
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the class given as value of the <parameter>newscope</parameter>
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the class given as value of the <parameter>newScope</parameter>
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parameter.
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</para>
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<para>
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Static closures cannot have any bound object (the value of the parameter
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<parameter>newthis</parameter> should be &null;), but this function can
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<parameter>newThis</parameter> should be &null;), but this function can
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nevertheless be used to change their class scope.
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</para>
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&reftitle.parameters;
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<variablelist>
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<varlistentry>
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<term><parameter>newthis</parameter></term>
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<term><parameter>newThis</parameter></term>
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<listitem>
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<para>
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The object to which the given anonymous function should be bound, or
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>newscope</parameter></term>
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<term><parameter>newScope</parameter></term>
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<listitem>
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<para>
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The class scope to which the closure is to be associated, or
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&reftitle.returnvalues;
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<para>
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Returns the newly created <classname>Closure</classname> object
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&return.falseforfailure;
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>7.0.0</entry>
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<entry>
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<parameter>newscope</parameter> can not be (an object of) an internal
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class anymore, what was possible prior to this version.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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or &null; on failure.
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</para>
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</refsect1>
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<![CDATA[
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<?php
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class A {
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function __construct($val) {
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class A
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{
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private $val;
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public function __construct($val)
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{
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$this->val = $val;
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}
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function getClosure() {
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//returns closure bound to this object and scope
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return function() { return $this->val; };
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public function getClosure()
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{
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// Returns closure bound to this object and scope
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return function() {
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return $this->val;
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};
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}
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}
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$cl = $ob1->getClosure();
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echo $cl(), "\n";
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$cl = $cl->bindTo($ob2);
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echo $cl(), "\n";
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?>
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]]>
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</programlisting>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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