<?xml version="1.0" encoding="iso-8859-2"?>
 <reference id="ref.classobj">
  <title>Funkce pro prci s tdami/objekty</title>
  <titleabbrev>Tdy/Objekty</titleabbrev>

  <partintro>
   <sect1 id="classobj.partintro">
    <title>vod</title>
    <sect2 id="classobj.intro">
     <title>About</title>
     <para>
      Tyto funkce vm umouj zskvat informace o tdch a instancch. Mete
      zjistit nzev tdy do kter objekt pat nebo jeho promnn a metody.
      Pomoc tchto funkc mete zjistit nejen pslunost objektu k td,
      ale i jeho pedka (tj. kterou tdu tda tohoto objektu roziuje).
     </para>
    </sect2>
    <sect2 id="classobj.example">
     <title>Ukzka pouit</title>
     <para>
      V tto ukzce nejdve definujeme zkladn tdu a rozen tto tdy.
      Zkladn tda popisuje obecnou zeleninu, a u je jedl nebo ne a bez
      ohledu na jej barvu. Podtda <varname>Spenat</varname> pidv metodu
      na uvaen tto zeleniny a dal, kter zjist, jestli je vaen.
     </para>
     <para>
      <example>
       <title>classes.inc</title>
       <programlisting role="php">
&lt;?php

// zkladn tda s lenskmi promnnmi a metodami
class Zelenina {

    var $jedla;
    var $barva;

    function Zelenina( $jedla, $barva=&quot;green&quot; ) {
        $this-&gt;jedla = $jedla;
        $this-&gt;barva = $barva;
    }

    function je_jedla() {
        return $this-&gt;jedla;
    }

    function jaka_barva() {
        return $this-&gt;barva;
    }

} // konec tridy zelenina


// rozsiruje zakladni tridu
class Spenat extends Zelenina {

    var $varena = false;

    function Spenat() {
        $this-&gt;Zelenina( true, &quot;zelena&quot; );
    }

    function cook_it() {
        $this-&gt;varena = true;
    }

    function je_varena() {
        return $this-&gt;varena;
    }

} // konec tridy Spenat

?&gt;
       </programlisting>
      </example>
     </para>
     <para>
     Potom z tchto td vytvome 2 objekty a vytiskneme informace o nich, v.
     rodiovskch td. Tak definujeme nkter pomocn funkce, pedevm kvli
     pohodlnmu tisku informac.
     </para>
     <para>
      <example>
       <title>test_script.php</title>
       <programlisting role="php">
&lt;pre&gt;
&lt;?php

include &quot;classes.inc&quot;;

// pomocn funkce

function vytiskni_promenne($obj) {
    $pole = get_object_vars($obj);
    while (list($vlastnost, $hodnota) = each($pole))
        echo &quot;\t$vlastnost = $hodnota\n&quot;;
}

function vytiskni_metody($obj) {
    $pole = get_class_methods(get_class($obj));
    foreach ($pole as $metoda)
        echo &quot;\tfunction $metoda()\n&quot;;
}

function class_parentage($obj, $class) {
    global $$obj;
    if (is_subclass_of($$obj, $class)) {
        echo &quot;Objekt $obj patri do tridy &quot;.get_class($$obj);
        echo &quot; ktera je podtridou $class\n&quot;;
    } else {
        echo &quot;Objekt $obj nepatri do podtridy tridy $class\n&quot;;
    }
}

// instancujeme 2 objekty

$zeleninka = new Zelenina(true,&quot;modra&quot;);
$listnaty = new Spenat();

// vytisknout informace o obou objektech
echo &quot;zeleninka: CLASS &quot;.get_class($zeleninka).&quot;\n&quot;;
echo &quot;listnaty: CLASS &quot;.get_class($listnaty);
echo &quot;, PARENT &quot;.get_parent_class($listnaty).&quot;\n&quot;;

// vytisknout vlastnosti zeleninky
echo &quot;\nzeleninka: Vlastnosti\n&quot;;
print_vars($zeleninka);

// a metody objektu listnaty
echo &quot;\nlistnaty: Metody\n&quot;;
print_methods($listnaty);

echo &quot;\nRodic:\n&quot;;
class_parentage(&quot;listnaty&quot;, &quot;Spenat&quot;);
class_parentage(&quot;listnaty&quot;, &quot;Zelenina&quot;);
?&gt;
&lt;/pre&gt;
       </programlisting>
      </example>
     </para>
     <para>
      Je teba poznamenat, e ve ve uveden ukzce je objekt
      <varname>$listnaty</varname> instanc tdy <classname>Spenat</classname>,
      kter je podtdou tdy <classname>Zelenina</classname>, a posledn st
      ve uvedenho skriptu tud vytiskne:
     </para>
     <para>
      <informalexample>
       <programlisting>
       [...]
Rodic:
Objekt listnaty nepatri do podtridy tridy Spenat
Object listnaty patri do tridy Spenat, ktera je podtridou tridy Zelenina
       </programlisting>
      </informalexample>
     </para>
    </sect2>
   </sect1>
  </partintro>

  <refentry id="function.call-user-method">
   <refnamediv>
    <refname>call_user_method</refname>
    <refpurpose>
     Zavolat uivatelsky definouvanou metodu uritho objektu
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>mixed</type><methodname>call_user_method</methodname>
      <methodparam><type>string</type><parameter>method_name</parameter></methodparam>
      <methodparam><type>object</type><parameter>obj</parameter></methodparam>
      <methodparam choice="opt"><type>mixed</type><parameter>parameter</parameter></methodparam>
      <methodparam choice="opt"><type>mixed</type><parameter>...</parameter></methodparam>
     </methodsynopsis>
    <para>
     Zavol metodu <parameter>method_name</parameter> objektu
     <parameter>obj</parameter>. Ukzka vyuit je ne, kde definujeme tdu,
     vytvome objekt a pouijeme <function>call_user_method</function> k
     nepmmu voln jej <varname>print_info</varname> metody.
     <informalexample>
      <programlisting role="php">
&lt;?php
class Country {
    var $NAME;
    var $TLD;

    function Country($name, $tld) {
        $this-&gt;NAME = $name;
        $this-&gt;TLD = $tld;
    }

    function print_info($prestr=&quot;&quot;) {
        echo $prestr.&quot;Country: &quot;.$this-&gt;NAME.&quot;\n&quot;;
        echo $prestr.&quot;Top Level Domain: &quot;.$this-&gt;TLD.&quot;\n&quot;;
    }
}

$cntry = new Country(&quot;Peru&quot;,&quot;pe&quot;);

echo &quot;* Calling the object method directly\n&quot;;
$cntry-&gt;print_info();

echo &quot;\n* Calling the same method indirectly\n&quot;;
call_user_method (&quot;print_info&quot;, $cntry, &quot;\t&quot;);
?&gt;
      </programlisting>
     </informalexample>
    </para>
    <simpara>
     Viz tak <function>call_user_func</function>.
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.class-exists">
   <refnamediv>
    <refname>class_exists</refname>
    <refpurpose>Zjistit, jestli je tda definovna</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>bool</type><methodname>class_exists</methodname>
      <methodparam><type>string</type><parameter>class_name</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrt &true;, pokud je tda
     <parameter>class_name</parameter> definovna, jinak &false;.
    </para>
   </refsect1>
  </refentry>

  <refentry id="function.get-class">
   <refnamediv>
    <refname>get_class</refname>
    <refpurpose>Vrtit jmno tdy objektu</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>get_class</methodname>
      <methodparam><type>object</type><parameter>obj</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac nzev tdy j je objekt <parameter>obj</parameter>
     instanc.
    </para>
    <simpara>
     Viz tak <function>get_parent_class</function>,
     <function>is_subclass_of</function>
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.get-class-methods">
   <refnamediv>
    <refname>get_class_methods</refname>
    <refpurpose>Vrtit pole nzv metod tdy</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>array</type><methodname>get_class_methods</methodname>
      <methodparam><type>string</type><parameter>class_name</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac pole nzv metod definovanch pro tdu specifikovanou
     argumentem <parameter>class_name</parameter>.
    </para>
    <simpara>
     Viz tak <function>get_class_vars</function>,
     <function>get_object_vars</function>
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.get-class-vars">
   <refnamediv>
    <refname>get_class_vars</refname>
    <refpurpose>Vrtit pole defaultnch vlastnost tdy</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>array</type><methodname>get_class_vars</methodname>
      <methodparam><type>string</type><parameter>class_name</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac pole defaultnch vlastnost tdy
     <parameter>class_name</parameter>.
    </para>
    <simpara>
     Viz tak <function>get_class_methods</function>,
     <function>get_object_vars</function>
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.get-declared-classes">
   <refnamediv>
    <refname>get_declared_classes</refname>
    <refpurpose>Vrtit pole nzv definovanch td</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>array</type><methodname>get_declared_classes</methodname>
      <void/>
     </methodsynopsis>
    <para>
     Tato funkce vrac pole nzv td definovanch v souasnm skriptu.
    </para>
    <note>
     <para>
      V PHP 4.0.1pl2 jsou na zatku pole vrceny jet ti dal tdy:
      <classname>stdClass</classname> (definovan v
      <filename>Zend/zend.c</filename>),
      <classname>OverloadedTestClass</classname> (definovan v
      <filename>ext/standard/basic_functions.c</filename>)
      a <classname>Directory</classname>
      (definovan v <filename>ext/standard/dir.c</filename>).
     </para>
    </note>
   </refsect1>
  </refentry>

  <refentry id="function.get-object-vars">
   <refnamediv>
    <refname>get_object_vars</refname>
    <refpurpose>Vrtit asociativn pole vlastnost objektu</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>array</type><methodname>get_object_vars</methodname>
      <methodparam><type>object</type><parameter>obj</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac asociativn pole definovanch vlastnost objektu
     <parameter>obj</parameter>. Promnnm deklarovanm v td j je
     <parameter>obj</parameter> instanc, kterm nebyla piazena hodnota,
     nejsou ve vrcenm poli obsaeny.
     <example>
      <title>Pouit <function>get_object_vars</function></title>
      <programlisting role="php">
&lt;?php
class Point2D {
    var $x, $y;
    var $label;

    function Point2D($x, $y) {
        $this-&gt;x = $x;
        $this-&gt;y = $y;
    }

    function setLabel($label) {
        $this-&gt;label = $label;
    }

    function getPoint() {
        return array("x" =&gt; $this-&gt;x,
                     "y" =&gt; $this-&gt;y,
                     "label" =&gt; $this-&gt;label);
    }
}

$p1 = new Point2D(1.233, 3.445);
print_r(get_object_vars($p1));
// "$label" is declared but not defined
// Array
// (
//     [x] =&gt; 1.233
//     [y] =&gt; 3.445
// )

$p1-&gt;setLabel("point #1");
print_r(get_object_vars($p1));
// Array
// (
//     [x] =&gt; 1.233
//     [y] =&gt; 3.445
//     [label] =&gt; point #1
// )

?&gt;
      </programlisting>
     </example>
    </para>
    <simpara>
     Viz tak <function>get_class_methods</function>,
     <function>get_class_vars</function>
    </simpara>
   </refsect1>
  </refentry>

  <refentry id="function.get-parent-class">
   <refnamediv>
    <refname>get_parent_class</refname>
    <refpurpose>Vrtit nzev rodiovsk tdy objektu</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>string</type><methodname>get_parent_class</methodname>
      <methodparam><type>object</type><parameter>obj</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac nzev rodiovsk tdy objektu
     <parameter>obj</parameter>.
    </para>
    <simpara>
     Viz tak <function>get_class</function>,
     <function>is_subclass_of</function>
    </simpara>
   </refsect1>
  </refentry>

 <refentry id="function.is-subclass-of">
   <refnamediv>
    <refname>is_subclass_of</refname>
    <refpurpose>
     Zjistit, jestli objekt pat do podtdy urit tdy
    </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_subclass_of</methodname>
      <methodparam><type>object</type><parameter>obj</parameter></methodparam>
      <methodparam><type>string</type><parameter>superclass</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac &true;, pokud je objekt
     <parameter>obj</parameter> instanc tdy, kter je podtdou
     <parameter>superclass</parameter>, jinak &false;.
    </para>
    <simpara>
     Viz tak <function>get_class</function>,
     <function>get_parent_class</function>
    </simpara>
   </refsect1>
  </refentry>
  <refentry id="function.method-exists">
   <refnamediv>
    <refname>method_exists</refname>
    <refpurpose>Zjistit, jestli m tda uritou metodu</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Popis</title>
     <methodsynopsis>
      <type>bool</type><methodname>method_exists</methodname>
      <methodparam><type>object</type><parameter>object</parameter></methodparam>
      <methodparam><type>string</type><parameter>method_name</parameter></methodparam>
     </methodsynopsis>
    <para>
     Tato funkce vrac &true;, pokud m
     <parameter>object</parameter> definovnu metodu
     <parameter>method_name</parameter>, jinak &false;.
    </para>
   </refsect1>
  </refentry>

 </reference>

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