中英结合的方式果然不错。我以前曾转载国人对于php安全编程的总结。有人说是老生长谈。这回看看外国朋友的作品。
据最新的调查,php语言的使用率竟超过了老牌语言c++,成为使用率第三位的编程语言。它有很多有用的功能,不过可能出现的问题也不少。这篇文章就列出了五条常用的建议以帮助你创造安全的php应用。
PHP is one of the most popular programming languages for the web. Sometimes a feature-friendly language can help the programmer too much, and security holes can creep in, creating roadblocks in the development path. In this tutorial, we will take a look at 5 tips to help you avoid some common PHP security pitfalls and development glitches.
建议1:使用错误报告要合适
Tip 1: Use Proper Error Reporting
开发过程中,错误报告挺有用。它能帮你找到一系列问题。但如果你在正式应用里仍打开这一功能,那会给不怀好意者以丰富信息。你可以在所有应用的文件代码前加入error_reporting(0);
如果出现某些问题你确实想知道,那么应该将错误报告输入到一受保护的文件中,这可以用函数 set_error_handler完成。
During the development process, application error reporting is your
best friend. Error reports can help you find spelling mistakes in your
variables, detect incorrect function usage and much more. However, once
the site goes live the same reporting that was an ally during
development can turn traitor and tell your users much more about your
site than you may want them to know (the software you run, your folder
structure, etc).
Once your site goes live, you should make sure to hide all error
reporting. This can be done by invoking the following simple function
at the top of your application file(s).
If something does go wrong, you still want and need to know about
it. Therefore, you should always make sure to log your errors to a
protected file. This can be done with the PHP function set_error_handler.
建议2:关闭php的坏功能
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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