[英]Call methods from another class with namespace (PHP)
我上课有问题。 我正在使用https://www.php-fig.org/psr/psr-4/自动加载类。
------------------------------------- /home/classes/a/casea.php
namespace Classes\A\CaseA;
class ClassA {
public function MethodA()
{
$resultA = 'Method A works!';
return $resultA;
}
}
------------------------------------- /home/classes/b/caseb.php
namespace Classes\B\CaseB;
class ClassB {
public function MethodB()
{
// Classes\A\CaseA\ClassA MethodA() don't work here.
// I tried this, but didn't work.
$obj = new Classes\A\CaseA\ClassA;
$result = $obj->MehodA();
return $result;
}
}
$classb = new Classes\B\CaseB\ClassB;
$show = $classb->MethodB();
echo $show;
--------------------- 自动加载
## PHP-FIG Autoload
spl_autoload_register(function ($class) {
// project-specific namespace prefix
$prefix = 'Classes\\';
// base directory for the namespace prefix
$base_dir = PATH . '/classes/';
// does the class use the namespace prefix?
$len = strlen($prefix);
if (strncmp($prefix, $class, $len) !== 0) {
// no, move to the next registered autoloader
return;
}
// get the relative class name
$relative_class = substr($class, $len);
// replace the namespace prefix with the base directory, replace namespace
// separators with directory separators in the relative class name, append
// with .php
$file = $base_dir . strtolower(str_replace('\\', '/', $relative_class)) . '.php';
// if the file exists, require it
if (file_exists($file)) {
require $file;
}
});
错误是下面的文字。
Fatal error: Uncaught Error: Class 'Classes\B\Classes\A\ClassA' not found in /home/domain.tld/classes/b/classb.php:11 Stack trace: #0
我解决了这个问题,如果有人需要这样的,可以使用以下代码。
在caseb.php
namespace Classes\B\CaseB;
use Classes\A\CaseA\ClassA;
class ClassB extends ClassA {
public function MethodB()
{
$result = parent::MehodA();
return $result;
}
}
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