PHP魔术变量__METHOD__,__FUNCTION__的区别,functionmethod
PHP魔术变量__METHOD__,__FUNCTION__的区别,functionmethod
__METHOD__ 类的方法名(PHP 5.0.0 新加)。返回该方法被定义时的名字(区分大小写)。
__FUNCTION__ 函数名称(PHP 4.3.0 新加)。自 PHP 5 起本常量返回该函数被定义时的名字(区分大小写)。在 PHP 4 中该值总是小写字母的。
文档解释都是说返回函数(方法)的名字。区别在于:
__FUNCTION__只是返回方法的名字;
__METHOD__返回类的名字和方法的名字。
<span> 1</span> <?<span>php </span><span> 2</span> <span>class</span><span> Test{ </span><span> 3</span> <span>public</span> <span>function</span><span> doit(){ </span><span> 4</span> <span>echo</span> <span>__FUNCTION__</span><span>; </span><span> 5</span> <span> } </span><span> 6</span> <span>public</span> <span>function</span><span> doitAgain(){ </span><span> 7</span> <span>echo</span> <span>__METHOD__</span><span>; </span><span> 8</span> <span> } </span><span> 9</span> <span> } </span><span>10</span> <span>$obj</span> = <span>new</span><span> Test(); </span><span>11</span> <span>$obj</span>-><span>doit(); </span><span>12</span> <span>echo</span> '<br>'<span>; </span><span>13</span> <span>$obj</span>-><span>doitAgain(); </span><span>14</span> ?>
输出结果为:
doit
Test::doitAgain
__LINE__ 文件中的当前行号。
__FILE__ 文件的完整路径和文件名。如果用在被包含文件中,则返回被包含的文件名。自 PHP 4.0.2 起,__FILE__ 总是包含一个绝对路径(如果是符号连接,则是解析后的绝对路径),而在此之前的版本有时会包含一个相对路径。
__DIR__ 文件所在的目录。如果用在被包括文件中,则返回被包括的文件所在的目录。它等价于 dirname(__FILE__)。除非是根目录,否则目录中名不包括末尾的斜杠。(PHP 5.3.0中新增) =
__FUNCTION__ 函数名称(PHP 4.3.0 新加)。自 PHP 5 起本常量返回该函数被定义时的名字(区分大小写)。在 PHP 4 中该值总是小写字母的。
__CLASS__ 类的名称(PHP 4.3.0 新加)。自 PHP 5 起本常量返回该类被定义时的名字(区分大小写)。在 PHP 4 中该值总是小写字母的。
__METHOD__ 类的方法名(PHP 5.0.0 新加)。返回该方法被定义时的名字(区分大小写)。
__NAMESPACE__ 当前命名空间的名称(大小写敏感)。这个常量是在编译时定义的。
魔术变量就是指那些根据不同环境有不同的取值
比如
__FILE__
就是一个典型的魔术变量,当它出现在a.php文件里时它的值就是a.php的具体路径,出现在b.php文件里就是b.php的具体路径
其他的一些魔术变量还有__FUNCTION__, __CLASS__
总之这些变量的值往往不是固定的,变来变去的,很神奇,像魔术一样,故叫做魔术变量

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