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李二狗 — @Meniny
Published 12:01 Jan 22, 2012.
Created by @ezra. Categorized in #Programming, and tagged as #PHP.
Source format: Markdown
系统常量，顾名思义就是 PHP 已经定义的常量，常见的系统常量有:
__FILE__ : .php 文件名。
__LINE__ : .php 文件行数。指示当前代码在第几行。
PHP_VERSION : 当前解释器版本号。
PHP_OS : 操作系统名称。
事实上 TRUE、FALSE、NULL 这三个大写形式也是系统预定义的常量。
<?php
echo __FILE__;
echo "\n";
echo __LINE__;
echo "\n";
echo PHP_VERSION;
echo "\n";
echo PHP_OS;
echo "\n";
?>
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