PHP偵測類別是否存在方法是什麼？
在PHP中可以使用“class_exists()”函數來偵測類別是否存，函數的作用是檢查類別是否已定義，其用法為“class_exists($class_name)”，其參數“ $class_name」代表要偵測的類別名稱。
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#範例程式碼
<?php
// 使用前检查类是否存在
if (class_exists('MyClass')) {
$myclass = new MyClass();
}
?><?php
/**
* Set my include path here
*/
$include_path = array( '/include/this/dir', '/include/this/one/too' );
set_include_path( $include_path );
spl_autoload_register();
/**
* Assuming I have my own custom exception handler (MyException) let's
* try to see if a file exists.
*/
try {
if( ! file_exists( 'myfile.php' ) ) {
throw new MyException('Doh!');
}
include( 'myfile.php' );
}
catch( MyException $e ) {
echo $e->getMessage();
}
/**
* The above code either includes myfile.php or throws the new MyException
* as expected. No problem right? The same should be true of class_exists(),
* right? So then...
*/
$classname = 'NonExistentClass';
try {
if( ! class_exists( $classname ) ) {
throw new MyException('Double Doh!');
}
$var = new $classname();
}
catch( MyException $e ) {
echo $e->getMessage();
}
/**
* Should throw a new instance of MyException. But instead I get an
* uncaught LogicException blah blah blah for the default Exception
* class AND MyException. I only catch MyException so we've got on
* uncaught resulting in the dreaded LogicException error.
*/
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