1. First, check whether php is running normally. Execute the command
php -v
as shown below. It will prompt that the command is not found, indicating that php is not running.
#2. Start php. The following directory is not a general directory. I use Alibaba Cloud Server. My php directory is in the following directory. If you installed php using other methods, you can look for the php directory.
The startup file is under the php root directory /sbin/php-fpm/alidata/server/php-5.4.23/sbin/php-fpm
3, As shown in the picture below, the reason why my 502 appears is because php has not been started, and the reason why it cannot be started is because the configuration file cannot be found. The reason is further investigated: the previous operation and maintenance ran away without configuring the environment. So the project cannot run. My solution here is to directly change the name of the directory /php-5.4.23/ to /php/
4. To summarize, if you access static files, there is no problem, but all PHP file access directly prompts a 502 error, then you can consider whether it is because the PHP function or the process has not started.
Check the php version through the command php -v
to check whether php has started normally. If it is indeed the 502 error caused by PHP not starting, then find your PHP root directory and find the corresponding configuration file /alidata/server/php-5.4.23/sbin/php-fpm
and then go Start it and solve other problems accordingly.
Recommended tutorial: PHP video tutorial
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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。

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。

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。

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。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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