因为在函数中include进文件后,文件中的所有变量变为函数里的局部变量,虽然也可以在函数中提前global声明,但对于大量变量却麻烦,而且这些变量在函数要转为全局变量以供其它地方使用还须通过$GLOBALS转换。有无办法像js一样使用<script>标签就可以动态加载全局变量?! <br /> <br /> 比如: <br /> <pre class='brush:php;toolbar:false;'>A.php<?phpinclude b.php;include c.php;....function fn($name) { include "{$name}.php";}fn('d');</pre> <br /> 最后成为: <br /> <pre class='brush:php;toolbar:false;'>A.php<?phpinclude b.php;include c.php;include d.php;...</pre> <br /> <br /> 不过我想是不可能的了,因为php虽然与js一样是顺序执行程序,但js却可以依赖HTMLDom机制,实行动态加载脚本,而php里的环境却没有,除非php重新构造include机制,通过引用或复制将函数include文件后的变量全部自动加入到全局变量$GLOBALS里来。 <br /> <br /> 对吗?! <p> </script>
回复讨论(解决方案)
1、不要拿 php 和 js 对比,两者的运行机制是不一样的
2、你说 像js一样使用<script>标签动态加载全局变量,但这个script标签,表示的是一个全局的程序段。并不在函数中 <br /> 3、虽然你的需求很奇怪,但也是可以实现的。当然还是要利用 $GLOBALS 这个渠道 <br /> <pre class='brush:php;toolbar:false;'>function fn($_Name) { include "{$_Name}.php"; foreach(get_defined_vars() as $_K=>$_V) { if(! in_array($_K, array('_Name', '_K', '_V')) $GLOBALS[$_K] = $_V; }}</pre> <br /> </script>
本帖最后由 xuzuning 于 2013-03-15 08:46:41 编辑
1、不要拿 php 和 js 对比,两者的运行机制是不一样的
2、你说 像js一样使用<script>标签动态加载全局变量,但这个script标签,表示的是一个全局的程序段。并不在函数中 <br /> 3、虽然你的需求很奇怪,但也是可以实现的。当然还是要利用 $GLOBA…… <br /> <br /> 还是有点不妥,因为get_defined_vars()会自动侦查对象(使用is_object()无法判断),并试图将其转为字符串,如果类中不定义__toString()的话会抛出致命错误。另外,如果被加载进来的文件已经把之前变量当作全局变量处理的话,你现在后面再来转换已经没有意义。 </script>
本帖最后由 xuzuning 于 2013-03-15 08:46:41 编辑
1、不要拿 php 和 js 对比,两者的运行机制是不一样的
2、你说 像js一样使用<script>标签动态加载全局变量,但这个script标签,表示的是一个全局的程序段。并不在函数中 <br /> 3、虽然你的需求很奇怪,但也是可以实现的。当然还是要利用 $GLOBA…… <br /> <br /> 我的确有这个需求,不过扬长避短,函数只需判断文件是否存在,如果是的话交给之前定义的全局变量,再在函数外include,而不是在函数内。 </script>
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