我正在编写一个 PHP 类,并且在定义范围时遇到了相当大的麻烦。我在 SO 上阅读了很多关于这个概念的文章,但我似乎无法确定我的代码有什么问题。
class Logger {
private static $logger ;
private $res ;
private $file ;
private $mode ;
public static function getInstance() {
if (!self::$logger) $instance = new self() ;
self::$logger = $instance ;
return self::$logger ;
}
private function initializeLogger( ) {
$this->file = '/tmp/mydirectory/mylog.log' ;
$this->res = fopen($this->file, 'a') or exit("Can't open ".$this->file);
}
public function write( $message , $modeLevel ) {
if ( !is_resource($this->res )) {
$this->initializeLogger( ) ;
}
fwrite($this->res, "$message" . PHP_EOL);
}
public function close()
{
fclose(self::$logger);
}
}
$log = Logger::getInstance();
$log.write( "WOW, it's working!!" , 1 );
此代码在运行时会产生: Call to undefined function write() in /var/www/myfile.php
关于如何创建可以以非静态方式引用的对象的任何建议,但