PHP中提问频率最高的11个面试题和答案_php技巧
你是否正在准备寻找一份PHP开发的工作,并且也在寻找一些关于PHP的面试题及答案?本文为大家分享了一些被提问频率最高的11个PHP面试题,以及对应的常规回答,每个公司都有自己的面试标准,面试和问题是完全取决于你在工作中所扮演的角色,当然也和你的编程技能息息相关。
问题:请用最简单的语言告诉我PHP是什么?
回答:PHP全称:Hypertext Preprocessor,是一种用来开发动态网站的服务器脚本语言。
问题:什么是MVC?
回答:MVC由Model(模型), View(视图)和Controller(控制器)组成,PHP MVC可以更高效地管理好3个不同层的PHP代码。
Model:数据信息存取层。
View:view层负责将应用的数据以特定的方式展现在界面上。
Controller:通常控制器负责从视图读取数据,控制用户输入,并向模型发送数据。
问题:在页面中引用CSS有几种方式?
回答:在页面中使用CSS有3中方式:
引用外部CSS文件
内部定义Style样式
内联样式
问题:PHP支持多继承吗?
回答:不可以。PHP类只能继承一个父类,并用关键字“extended”标识。
问题:请问PHP中echo和print有什么区别?
这两个看起来很相似,因为它们都是将一些值打印在屏幕上。但是echo和print的本质区别在于:echo用来输出字符串,显示多个值的时候可以用逗号隔开。只支持基本类型,print不仅可以打印字符串值,而且可以打印函数的返回值。
问题:请问GET和POST方法有什么区别?
回答:我们再网页上填写的表单信息都可以通过这两个方法将数据传递到服务器上,当我们使用GET方法是,所有的信息都会出现在URL地址中,并且使用GET方法最多只能传递1024个字符,所以如果在传输量小或者安全性不那么重要的情况下可以使用GET方法。说到POST方法,最多可以传输2MB字节的数据,而且可以根据需要调节。
问题:PHP中获取图像尺寸大小的方法是什么?
回答:getimagesize () 获取图片的尺寸
Imagesx () 获取图片的宽度
Imagesy () 获取图片的高度
问题:PHP中的PEAR是什么?
回答:PEAR也就是为PHP扩展与应用库(PHP Extension and Application Repository),它是一个PHP扩展及应用的一个代码仓库。
问题:如何用PHP和MySQL上传视频?
回答:我们可以在数据库中存放视频的地址,而不需要将真正的视频数据存在数据库中。可以将视频数据存放在服务器的指定文件夹下,上传的默认大小是2MB,但是我们也可以在php.ini文件中修改max_file size选项来改变。
问题:PHP中的错误类型有哪些?
回答:PHP中遇到的错误类型大致有3类。
提示:这都是一些非常正常的信息,而非重大的错误,有些甚至不会展示给用户。比如访问不存在的变量。
警告:这是有点严重的错误,将会把警告信息展示给用户,但不会影响代码的输出,比如包含一些不存在的文件。
错误:这是真正的严重错误,比如访问不存在的PHP类。
问题:如何在PHP中定义常量?
回答:PHP中使用Define () 来定义常量。
define (“Newconstant”, 30);
问题:如何不使用submit按钮来提交表单?
如果我们不想用submit按钮来提交表单,我们也可以用超链接来提交,我们可以这样写代码:

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