The full English name of php is "Hypertext Preprocessor", which means hypertext preprocessor; php is an open source general computer scripting language, especially suitable for network development and can be embedded in HTML.
#The operating environment of this article: Windows 7 system, PHP version 7.4, Dell G3 computer.
php What does it mean in English?
php The full English name is "PHP: Hypertext Preprocessor".
PHP (full name: PHP: Hypertext Preprocessor, that is, "PHP: Hypertext Preprocessor") is an open source general-purpose computer scripting language, especially suitable for network development and can be embedded in HTML. The syntax of PHP draws on the characteristics of popular computer languages such as C language, Java and Perl, making it easy for ordinary programmers to learn. The main goal of PHP is to allow web developers to quickly write dynamic pages, but PHP is also used in many other areas.
PHP was originally developed by Ledolf in 1995; the PHP standard is now maintained by the PHP Group[4]. PHP uses PHP License as the license agreement, but because this agreement restricts the use of the PHP name, it is incompatible with the open source license agreement GPL.
PHP has a wide range of applications, especially in the development of web programs. Generally speaking, PHP is mostly executed on the web server, and the web pages browsed by users are generated by executing PHP code. PHP can be executed on most servers and operating systems. According to statistics in April 2013, PHP has been installed on more than 244 million websites and 2.1 million servers [6].
PHP has a dedicated official porting and compilation project on Windows, and provides different version support through multiple VC compiler versions and thread safety features.
According to the W3Techs report, as of September 2021: "78.9% of websites use PHP."
Recommended learning: "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。

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。

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。

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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