php报错启动配置
PHP 报错信息
2008年11月22日 星期六 03:16 P.M.
设定错误讯息回报的等级。
语法: int error_reporting(int [level]);
传回值: 整数
函式种类: PHP 系统功能
E_NOTICE 表示一般情形不记录,只有程式有错误情形时才用到,例如企图存取一个不存在的变数,或是呼叫 stat() 函式检视不存在的档案。
E_WARNING 通常都会显示出来,但不会中断程式的执行。这对除错很有效。例如:用有问题的常规表示法呼叫 ereg()。
E_ERROR 通常会显示出来,亦会中断程式执行。意即用这个遮罩无法追查到记忆体配置或其它的错误。
E_PARSE 从语法中剖析错误。
E_CORE_ERROR 类似 E_ERROR,但不包括 PHP 核心造成的错误。
E_CORE_WARNING 类似 E_WARNING,但不包括 PHP 核心错误警告。
PHP 的错误报告
php.ini 文件中有许多配置设置。您应当已经设置好自己的 php.ini 文件并把它放在合适的目录中,就像在 Linux 上安装 PHP 和 Apache 2 的文档说明中所示的那样(请参阅 参考资料)。在调试 PHP 应用程序时,应当知道两个配置变量。下面是这两个变量及其默认值:
ps:上面的一些值可能有误,
display_errors = Off
error_reporting = E_ALL
通过在 php.ini 文件中搜索它们,可以发现这两个变量当前的默认值。display_errors 变量的目的很明显 ―― 它告诉 PHP 是否显示错误。默认值是 Off。但是,要让开发过程更加轻松,请把这个值设为 On:
display_errors = On
error_reporting 变量的默认值是 E_ALL。这个设置会显示从不良编码实践到无害提示到出错的所有信息。E_ALL 对于开发过程来说有点太细,因为它在屏幕上为一些小事(例如变量未初始化)也显示提示,会搞糟浏览器的输出。我只想看到错误和不良编码实践,但是不想看到无害的提示。所以,请用以下值代替 error_reporting 的默认值:
error_reporting = E_ALL & ~E_NOTICE
重新启动 Apache,就全部设置好了。接下来,将学习如何在 Apache 上做同样的事。
服务器上的错误报告
依赖于 Apache 正在做的工作,在 PHP 中打开错误报告可能没法工作,因为在计算机上可能有多个 PHP 版本。有时很难区分 Apache 正在使用哪个 PHP 版本,因为 Apache 只能查看一个 php.ini 文件。不知道 Apache 正在使用哪个 php.ini 文件配置自己是一个安全问题。但是,有一种方法可以在 Apache 中配置 PHP 变量,从而保证设置了正确的出错级别。
而且,最好知道如何在服务器端设置这些配置变量,以否决或抢占 php.ini 文件,从而提供更高级别的安全性。
在配置 Apache 时,应该已经接触过
要做在 php.ini 文件中已经做过的事,请把下列各行添加到 httpd.conf,覆盖任何 php.ini 文件:
php_flag display_errors on
php_value error_reporting 2039
这会覆盖在 php.ini 文件中为 display_errors 已经设置的标志,以及 error_reporting 的值。值 2039 代表 E_ALL & ~E_NOTICE。如果愿意采用 E_ALL,请把值设为 2047。同样,还是要重启 Apache。
接下来,要在服务器上测试错误报告。
出处:http://hi.baidu.com/chinamartin/blog/item/cb138c1a2aa1cefdae5133d8.html

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Chinese version
Chinese version, very easy to use

Atom editor mac version download
The most popular open source editor

SublimeText3 Mac version
God-level code editing software (SublimeText3)