The differences between php and java are: 1. Java is an object-oriented programming language, while PHP is a general open source scripting language; 2. PHP is much simpler than Java; 3. PHP is mainly used on websites In terms of performance, it is suitable for rapid development, while Java has a wide range of application fields, such as embedded fields, financial industry servers, etc.
The difference between php and java
First of all, conceptually, Java is an object-oriented programming language. It has the characteristics of simplicity, object-oriented, distributed, robustness, security, platform independence and portability, multi-threading, dynamics, etc.; PHP is a general open source scripting language whose syntax absorbs the characteristics of C language, Java and Perl. Features, conducive to learning and widely used.
Secondly, judging from the difficulty of learning, PHP is much simpler than Java. Java has academic requirements. People with a bachelor's degree or above are more suitable to learn Java and can learn Java. The educational requirements for PHP are relatively low, and people with college, junior high and high school degrees can also learn PHP.
Thirdly, from the application field, PHP is mainly used in websites. It is suitable for rapid development of small and medium-sized application systems. It has low development costs and can be adjusted in time if there are any changes. The application fields of Java are much wider, because Java has a complete framework and has good stability in multi-threading and high concurrency. Therefore, Java is needed in websites, embedded fields, financial industry servers, Android applications and other fields. Develop talent.
Finally, let’s distinguish from the development prospects. If you want to focus on the development of the WEB field in the future, then learning PHP is enough, while Java is suitable for large systems. If you don’t plan to only do web, you can learn Java. .
Recommended: "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。

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。

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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