php is simpler than asp:
asp is an obsolete language and almost no new companies use it now ASP developed website. PHP is the most commonly used language for developing websites in the world. Large websites such as Baidu and Yahoo are all structured using PHP, so it is recommended to learn PHP. The syntax of asp and php is not very different, both are embedded scripting languages. Quite difficult. But if you go deeper, php is more complicated.
Comparison:
#asp: Cannot cross operating systems
php: Quick learning, cross-platform, good database interaction ability, with apache and others The extension library is tightly integrated, takes up less system resources, has fast code execution speed, is open source and free.
In all aspects, PHP is relatively better. In terms of performance and security, PHP is still better.
Both of these are programming languages for web. In theory, in terms of security: php>asp. Theoretically, in terms of execution efficiency: php>asp.
php is used for medium-sized systems. Some parts of Taobao are written in php. ASP is generally used for small and medium-sized website building systems.
PHP is better than ASP:
ASP is built on the COM architecture. When writing ASP scripts with VBScript, it actually uses COM objects. When sending information to the user's browser, it uses the write method of the Response object. When it accesses the database and file system, it uses other COM object. The use of these COM objects slows down the running speed.
In PHP code, all work runs in PHP's memory space, which means that PHP is not based on COM objects, so its running speed will be faster.
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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。

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。

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)”。

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。


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