Úvod Webhosting Cenník Nastavenia služieb Referencie Reklama Kontakty CONTROL PANEL

 
 PHP manuál : function.is-a.html

is_a
PHP Manual
PrevNext

is_a

(PHP 4 >= 4.2.0, PHP 5)

is_a --  Returns TRUE if the object is of this class or has this class as one of its parents

Description

bool is_a ( object object, string class_name )

This function returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.

Example 1. is_a() example

<?php
// define a class
class WidgetFactory
{
  var $oink = 'moo';
}

// create a new object
$WF = new WidgetFactory();

if (is_a($WF, 'WidgetFactory')) {
  echo "yes, \$WF is still a WidgetFactory\n";
}
?>

The is_a() function is deprecated as of PHP 5 in favor of the instanceof type operator. In the above example we could use the following in PHP 5:

Example 2. Using the instanceof operator in PHP 5

<?php
if ($WF instanceof WidgetFactory) {
    echo 'Yes, $WF is a WidgetFactory';
}
?>

See also get_class(), get_parent_class(), and is_subclass_of().

PrevHomeNext
interface_existsUpis_subclass_of

webmailWebmail


Zaujímavé linky



inzerat.sk - bezplatna inzercia, inzeraty, autobazar, reality

Slovak companies and manufacturers directory

Katalog slovenskych firiem a vyrobkov
Suppliers and products directory
 created by RealData (2005)
 www.realdata.sk  
Všetky ceny sú s 20% DPH.    Konverzny kurz: 1 EUR = 30,1260 SKK
Ceny nezahŕňajú ročný udržiavací poplatok za doménu, ktorý platíme jednotlivým správcom domén.

stránka vygenerovaná za 0.3002s

webhosting zaregistrujte si domenu