


Solution: 1. Find the directory where the php software is located and copy the file path containing "php.exe"; 2. Right-click "This Computer" and click "Properties"; 3. Click "Advanced System Settings" -"Advanced"-"Environment Variables"; 4. Select "Path" in "System Variables" and click "Edit"; 5. Add the storage directory path of "php.exe" in the "Edit Environment Variables" interface. .
The operating environment of this tutorial: windows10 system, PHP8 version, DELL G3 computer
Execute the php -v
command, The prompt 'php is not an internal command or an external command ' is because the PHP environment variables are not configured or are incorrect. Just add the path to php to the system's path variable.
Specific steps for php to configure environment variables:
Step one: Find the directory where the php software is located, and copy the directory containing php. The file path of the exe.
The [Wampserver] demonstration is used here, and the others are similar.
The storage location of php is:
Add this path to the environment variable.
Step 2: Right-click "This Computer" and click Properties
Step 3: Click "Advanced System" Settings"-"Advanced"-"Environment Variables"
Step 4: Select "Path" in "System Variables" for editing
Step 5: Add the directory where the PHP installation package is stored in "Edit Environment Variables"
windows Check whether the PHP environment variable is successful
(1) Open the windows command window and enter the following cmd command
php -v
(2) If the PHP version number is output, it proves that the PHP environment variable configuration is successful
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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。

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。

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。

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。

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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