我从Zend
PHP学习指南中得到这个问题,找不到正确的解释…
<?PHP class Magic { public $a = "A"; protected $b = array("a"=>"A","b"=>"B","c"=>"C"); protected $c = array(1,2,3); public function __get($v) { echo "$v,"; return $this->b[$v]; } public function __set($var,$val) { echo "$var: $val,"; $this->$var = $val; } } $m = new Magic(); echo $m->a.",".$m->b.",".$m->c.","; $m->c = "CC"; echo $m->a.",".$m->c; ?>
根据指南,解决方案应为“b,c,A,B,C,c:CC,b,C”.我不明白为什么 – 也许你这样做?我的意图是,首先调用$m-> a会导致结果“a”,但这显然是错误的…
由于__get()调用echo,所以在调用外部的echo之前,会输出一些数据.
用echo回到第一行,这是如何执行的:
$m->a "A" is concatenated "," "," is concatenated $m->b "b," is echoed,"B" is concatenated "," is concatenated $m->c "c,"C" is concatenated "m" "," is concatenated
此时,c已经被回显,现在显示值为A,Cm的字符串.
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