4-1 减少PHP魔法函数的使用 __get($name)返回私有变量 取执行时间

<?php

class Test{
    private $var=‘123‘;
    public function __get($name)
    {
        return $this->var;
    }

}
function current_time(){
    list($usec,$sec)= explode(‘ ‘,microtime());
    return ((float)$usec+(float)$sec);
}
$_start=current_time();
$i=0;
while ($i<20000){
    $i++;
    $t=new Test();
    $t->var;
}
$_end=current_time();
header(‘Content-Type:text/html;charset=utf‘);
echo ‘执行时间‘.number_format($_end-$_start,3);

<?php

class Test{
   // private $var=‘123‘;
    public $var=‘123‘;
 /*   public function __get($name)
    {
        return $this->var;
    }*/

}
function current_time(){
    list($usec,$sec)= explode(‘ ‘,microtime());
    return ((float)$usec+(float)$sec);
}
$_start=current_time();
$i=0;
while ($i<20000){
    $i++;
    $t=new Test();
    $t->var;
}
$_end=current_time();
header(‘Content-Type:text/html;charset=utf‘);
echo ‘执行时间‘.number_format($_end-$_start,3);