в 10:37, 26 мая 2010

2010-05-26T10:37:34Z

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2010-05-26T07:07:02Z

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==Checking for the Existence of Classes and Interfaces Using class_exists() and interface_exists()==



<source lang="html4strict">

<?
class Shape {
function __construct($name) {
}
}
$polly = new Shape ( "A" );
$tweety = new Shape ( "C" );
$square = new Shape ( "S" );
$classes = array ("Parrot", "Canary", "Bird", "Monkey", "Pet" );
$interfaces = array ("Pet", "Product", "Customer", "Bird" );
print "";
foreach ( $classes as $class )
printf ( "The class "%s" is %sdefined. \n", $class, class_exists ( $class, FALSE ) ? "" : "un" );
print "\n";
foreach ( $interfaces as $interface )
printf ( "The interface "%s" is %sdefined. \n", $interface, interface_exists ( $interface, FALSE ) ? "" : "un" );
print "\n";
?>

</source>

==Helpful Utility Functions==



<source lang="html4strict">

<?
if ($foo = = $bar) {
$sam = new Employee;
} else {
$sam = new Dog;
}
print "Sam is a " . get_class($sam) . "\n";
print "Class animal exists: " . class_exists("animal") . "\n\n\n\n";
print "All declared classes are: " . get_declared_classes( ) . "\n";
?>

</source>

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в 10:37, 26 мая 2010

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