Checks if the interface has been defined
Syntax
interface_exists ( string $interface_name [, bool $autoload = TRUE ] ) : bool
Parameters
interface_nameThe interface name
autoloadWhether to call __autoload or not by default.
Return
Returns TRUE if the interface given by interface_name has been defined, FALSE otherwise.
Examples
1 · interface_name
<?
interface myinterface
{
}
$interface_name = "myinterface";
$return = interface_exists($interface_name);
var_export($return);
?>true
2 · autoload
<?
interface myinterface
{
}
$interface_name = "myinterface";
$autoload = false;
$return = interface_exists($interface_name, $autoload);
var_export($return);
?>true
3 · 1
<?
interface myinterface
{
}
$interface_name = "myinterface";
$return = interface_exists($interface_name);
if ($return)
{
class myclass implements myinterface
{
function __construct()
{
echo __METHOD__;
}
}
new myclass();
}
?>myclass::__construct
