Solution to php 500 internal server error: first find the php configuration file and configure the parameter value to "display_errors = On"; then add "php_flag display_errors" to the apache configuration file; finally restart the apache service. Can.
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php server 500 error solution
php newbie After setting up the development environment in the initial stage, when a syntax error occurs during development, the server returns 500 (server internal error) instead of returning an error message. At this time, you need to make some configurations in the development environment to help you quickly find the cause of the problem, locate the problem, and solve the problem.
Find the php configuration file /etc/php.ini
Configuration parameter value: display_errors = On
error_reporting = E_ALL | E_STRICT
Restart the apache service service httpd restart
This At this time, the browser can already output error messages.
You need to configure apache again /etc/httpd/conf/httpd.conf
Add two lines at the end of the apache configuration file:
php_flag display_errors on php_value error_reporting 2039
Restart apache.
The setting of parameters in php.ini can also be done in php code.
Call: Call the ini_set() function
//开启php.ini中的display_errors指令 ini_set('display_errors',1); //通过error_reporting()函数设置,输出所有级别的错误报告 error_reporting(E_ALL);
This can be used dynamically and output errors in the specified php file.
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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。

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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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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。


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