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为什么那么多人吐糟PHP 也没说原因

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Jun 06, 2016 pm 08:39 PM

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为什么那么多人吐糟PHP 也没说原因

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为什么那么多人吐糟PHP 也没说原因

客观的回答：

1.PHP语言以及环境，与其他主流语言及其环境相比，很差，这是缺点。

2.PHP在互联网发展史上曾经非常辉煌，Web2.0基本上是它的功劳。而且那个年代能赚钱的基本上也都是PHP的，这些是优点。

所以，由于PHP有矛盾如此激烈的缺点与优点，所以才会产生巨大的争议与话题。其他语言由于没有这么激烈的矛盾，所以不会出现这种情况。

我之前写过很久 PHP, 但现在是 PHP 黑，简单说一下原因。

语法设计不合理

这个诚然有历史原因，但确实是不合理。
- 命名空间用（\）分隔，简直丧心病狂；对象成员用（->）访问，略显繁琐
- 函数名不区分大小写，老版本的类名也不区分大小写，而变量名却区分大小写
- 数组的写法繁琐（array()），直到 5.4 才有简写语法（[]）
- 这样function test_array(array $input_array), 可以限制参数的类型，适用于类和数组，却不适用于 int 和 string
- unset, echo, empty, list 长得像函数，却不是函数
- 直到 5.4 才支持 func()[0] 这种写法
- 大部分内部函数默认不会抛出异常，导致 PHP 中存在两套独立的错误处理机制
很多被弃用的功能仍被广泛使用，新的功能被普及得很慢

这个是使用者的事情，但情况就是如此。

在开源软件中更为突出，比如 WordPress 为了尽可能兼容旧的 PHP 版本，没法用上例如匿名函数(5.3), 数组简写语法(5.4) 这种能够大幅改善代码可读性的功能。

下面是一些被弃用的功能，这些功能大多是设计上存在失误，后来因为可能导致潜在的问题被弃用，但因为网络上互相转载的一些不靠谱教程，所以很多人依然在使用。
- __autoload
- mysql_* 系列函数
- Register Globals
- Magic Quotes
- Safe Mode
缺少好用的包管理器和依赖管理方案

PHP 和 Python, Ruby, Node.js 在使用领域上是有一定重叠的，我们来比较一下包的数量：
- PHP Composer: 46k
- Python PyPI: 53k
- Ruby Gems: 94k
- Node.js NPM: 116k
虽然包的数量不代表质量，但是代表了人们是否愿意发布和使用包。

Composer 在 PHP 中的普及率恐怕不及上面其他三款包管理器，比如作为最火的博客程序 WordPress, 和国内的 Typecho 都没有使用 Composer, 而是直接在源代码中包含所有依赖。
必须为每个请求创建一个单独的进程

PHP 必须为每个请求创建一个进程（或线程），这导致在高并发的情况下会占用大量内存。

在 PHP 中很难创建一个资源，并让它可以在全局范围内，可以被所有请求访问到，只能通过外部的数据库或缓存来实现。亦没有办法定义一项任务，独立于其他请求运行，只能通过单独的任务队列来解决。虽然这两个问题并不严重，但无法轻量级地维护全局的状态，算是一个缺憾。
PHP 是为 Web 优化的编程语言
- 可以直接用 $_GET 和 $_POST 访问来自客户端的 GET 和 POST 数据
- 可以用 <?php ?> 的方式嵌入到 HTML 文件中
现在大多数 Web 程序，往往都是 MVC 架构，在这种架构下，具有额外语法糖的 PHP 并不会比通用编程语言更好用。

相反的方面，虽然 PHP 可以用于 Web 之外的场景，但坑实在是多。例如缺少好用的异步流程控制的方案等。

黑某种语言只能说明此人见识少，语言只是工具，适用于不同的场合，不喜欢可以不用。你都不用了怎么有资格黑。

比如有些人说php的shell功能弱，人家php天生就是为web开发设计，你要拿筷子当叉子用，还说人家不好用。

比如说php性能差，殊不知很多.Net和Java的初学者写出来的网站，一堆的性能bug，难道这不是php设计上的优点。

有优点当然也有缺点，关键看你怎么用。黑PHP的人估计是想不明白为啥国内大的互联网公司都用PHP

php上手简单没什么难度
黑他只是为了显示自己学的语言有多好
黑他才能显得自己水平高
Python c c++ 语言也都有自己不足的地方你也去黑黑
对php了解一些了你就使劲黑吧

有句话说程序员应该为自己的行为负责但是实际上很少有程序员做的到这点于是有c++ c# java这种强类型语言来约束程序员的行为
php显然缺少这些条条框框而且php弱类型的实现的却有一些诟病的地方

同意 @我是谁啊2015_73720 的说法，总不能说手机没有单反拍照好用，就说手机设计不合理，人家生来就不是做这件事的，做好本职工作就足够了。

更新换代速度慢是注定的，庞大的用户量不是PHP说升级就能升级的，至少要用户配合。微软这样致力推广Windows的更新，现在还不是一样有不少用人XP的？

PHP是世界上最好的语言，没有之一

请注意

PHP是世界上最好的语言，没有之一

这种问题以后少问，如果PHP不好，那么怎么还那么多公司用？
PHP不死，这种问题这轮不到你们这些人来评论！

PHP是世界上最好的语言，没有之一

来自知乎的回答

楼上好多大神啊！！！

自以为是的大婶。。。

不懂就乱黑。。。笑

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