Excellent PHP code should be structured. Large sections of code should be divided into functions and methods, and those small and inconspicuous sections of code should be commented so that their purpose can be made clear in the future. And the front-end code such as HTML, CSS, Javascript, etc. should be separated from the program as much as possible. PHP's object-oriented programming features can help programmers organize their code in an orderly manner.
Excellent PHP code should be standardized. Whether it's setting naming rules for variable and function names, standardizing reusable processes such as database operations and error handling, or as simple as specifying how code should be indented, these standardizations can make the code more readable. Readability is greatly improved.
Excellent PHP code should be adaptive. PHP has many features such as magic quotes and short tags. Turning these features on and off will affect the running of the program. Therefore, a good programmer should add appropriate statements to his code so that the program can adjust according to the environment.
Good PHP code should be safe. Although PHP is an efficient and flexible language with no fixed framework, it leaves security issues to programmers. A deep understanding of potential security vulnerabilities, such as cross-site scripting (XSS), cross-site request forgery (CSRF), code injection vulnerabilities, character encoding loop vulnerabilities, etc., is crucial for today's professional programmers.
When a candidate answers these questions, I will know clearly whether I should hire him or her. Of course, sometimes programmers can't articulate the problem well, and we ask them to do some PHP testing. Many of the questions in the test may seem very simple on the surface, but they also give candidates a chance to express themselves, because if you look carefully, you can spot the problems.
The following small piece of "poor" PHP code is a simplified test question. This kind of question is like asking: How should you optimize this code?
<? echo("<p>Search results for query: " . $_GET['query'] . ".</p>"); ?>
The main problem with this code is that it displays user-submitted data directly on the web page, thus creating an XSS vulnerability. There are actually many ways to fill this hole. So, what code do we want?
<? echo("<p>Search results for query: " . htmlspecialchars($_GET['query']) . ".</p>"); ?>
This is the minimum requirement. The XSS vulnerability was filled with the htmlspecialchars function, thus blocking illegal characters.
<?php if (isset($_GET['query'])) { echo '<p>Search results for query: ', htmlspecialchars($_GET['query'], ENT_QUOTES), '.</p>'; } ?>
People who can write such code should be the ones I want to hire.
- was replaced by
- Check whether the value of $_GET['query'] is empty before outputting it.
- The redundant parentheses in the echo command have been removed.
- Strings are qualified with single quotes, thus saving PHP time searching for replaceable variables in the string.
- Use commas instead of periods to save echo time.
- Pass the ENT_QUOTES flag to the htmlspecialchars function to ensure that single quotes are also escaped. Although this is not the most important thing, it is also a good habit.

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。

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。

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。

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。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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