Why doesn’t php parse?
Solution to PHP not parsing under Linux
There was no test after installing PHP last time. Recent tests found that the PHP code was not executed and was not parsed. , the performance is, return source code
test file test.php
code is
<?php phpinfo(); ?>
should return the php information page, but only the source code is returned, the troubleshooting information is as follows:
1.apache has not added the corresponding php type, so it does not support php script parsing
Solution: Add the corresponding type in the configuration file
Find the apache configuration file: If you know the location, find it yourself. If you don’t know the location, try using the find command
Execute in the root directory: #find / -name "httpd.conf"
Modify httpd.conf in the file Add a line of content: AddType application/x-httpd-php .php
2. There is no index for php. Without the support of this index, web pages written in php cannot be parsed
Solution: Add the corresponding index in the configuration file
Find the configuration file as above, find DirectoryIndex index.html
Change to DirectoryIndex index.html index.htm index.php
3. Turn on the firewall
Use the command: #getenforce
to check the status of the firewall. If it is Enforcing, it means it is on. Please turn it off in the configuration file
In the /etc/selinu directory, modify the enforcing in the config to disabled
4. The php5_module module is not loaded
Solution: Add the module
in the configuration file Add: LoadModule php5_module modules/libphp5.so
Finally restart the machine.
At this point, there should be no problem. Retest, you can return PHP information
For more PHP related knowledge, please visit PHP 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。

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。


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