php是什么文件 如何打开PHP文件
PHP是什么文件？
PHP，一个嵌套的缩写名称，是英文“超级文本预处理语言”（PHP:Hypertext Preprocessor）的缩写。PHP 是一种 HTML 内嵌式的语言，PHP与微软的ASP颇有几分相似，都是一种在服务器端执行的“嵌入HTML文档的脚本语言”，语言的风格有类似于C语言，现在被很多的网站编程人员广泛的运用。PHP 独特的语法混合了 C、Java、Perl 以及 PHP 自创新的语法。它可以比 CGI 或者 Perl 更快速的执行动态网页。用PHP做出的动态页面与其他的编程语言相比，PHP是将程序嵌入到HTML文档中去执行，执行效率比完全生成HTML标记的CGI要高许多；与同样是嵌入HTML文档的脚本语言JavaScript相比，PHP在服务器端执行，成分利用了服务器的性能；PHP执行引擎还会将用户经常访问的PHP程序驻留在内存中，其他用户在一次访问这个程序时就不需要诚信编译程序了，只要直接执行内存中的代码就可以了，这也是PHP高效率的体现之一。PHP具有非常强大的功能，所有的CGI或者JavaScript的功能PHP都能实现，而且支持几乎所有流行的数据库以及操作系统。
如何打开PHP文件？
一般来说，用文本编辑工具都可打开PHP文件如notepad、emeditor、phpedit、Dreamwere，推荐使用Dreamwer编辑PHP文件上，如果您打开的PHP文件全是乱码，那么这个PHP文件就是经过zend加密过的php文件，无法再编辑和修改，但可以正常的运行，如果您要运行PHP文件那么您就得安装相应的php解释器和web服务支持才行。想知道如何运行PHP文件请要看PHP教程
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