Checking for the Existence of Classes and Interfaces Using class_exists() and interface_exists() : class_exists « Reflection « PHP

1. PHP
2. Reflection
3. class_exists

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

 
<?
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 "<p>";
foreach ( $classes as $class )
  printf ( "The class '%s' is %sdefined.<br />\n", $class, class_exists ( $class, FALSE ) ? '' : 'un' );
print "</p>\n<p>";

foreach ( $interfaces as $interface )
  printf ( "The interface '%s' is %sdefined.<br />\n", $interface, interface_exists ( $interface, FALSE ) ? '' : 'un' );
print "</p>\n";
?>
  
  

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