Differences: 1. PHP is a server-side language, while JavaScript is a client-side language; 2. PHP's string concatenation is ".", while JS's is " "; 3. Array addition , PHP uses " ", and JS uses the concat() function; 4. PHP only has variable names that are case-sensitive, while JS is all case-sensitive.
The operating environment of this tutorial: windows7 system, javascript1.8.5&&PHP7.1 version, Dell G3 computer.
What is PHP?
PHP (Hypertext Preprocessor, hypertext preprocessor) is a general open source, simple, object-oriented, interpreted, robust, safe, and very performant A high-performance, architecture-independent, portable, dynamic scripting language.
PHP is a scripting language executed on the server side. It is similar to C language and is a commonly used website programming language. PHP's unique syntax mixes C, Java, Perl, and PHP's own syntax. It is conducive to learning and widely used. It is mainly suitable for the field of web development.
What is JavaScript?
JavaScript is a high-level scripting language that synchronizes with client-side scripts. It is a versatile language for the front-end and is mainly used to make web pages interactive and dynamic. It was originally developed to perform client-side functions, but since the release of Node.js in 2009, it has gradually evolved to provide server-side functions as well.
It is a versatile programming language specially designed for building interactive web interfaces that make websites look really good. It is one of the most powerful programming languages for creating interactive effects in the web browser without interacting with the server side.
The difference between php and JavaScript
1. The basic characteristics of the two are different:
PHP is a general-purpose open source scripting language, a server-side language. The syntax absorbs the characteristics of C language, Java and Perl, which is easy to learn and widely used. It is mainly suitable for the field of Web development.
js is a scripting language that belongs to the Internet. It is a client language that has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with a smoother and more beautiful experience. Browse the effects. Usually JavaScript scripts realize their functions by embedding them in HTML.
2. String connector
The string connector of PHP is: "."
The string connector of JavaScript is:" "
3. Array addition
php array addition: " ", you can add it directly
JavaScript uses the splicing function: concat( )
4. Case sensitivity
php: Only variable names are case-sensitive
JavaScript: All are case-sensitive
5. Declare variables
php: Variable declaration: " $Variable name
"
JavaScript: Variable declaration: " var Variable name
"
6. Regarding the parsing mechanism of single quotes and double quotes
php: Double quotes can parse special characters, including variables. Single quotes don't work.
JavaScript: There is no difference between single quotes and double quotes.
7. The difference between actual formal parameters
In JavaScript, there is no limit on the number of formal parameters and actual parameters. The number of formal parameters can be greater or less than the actual parameters. ginseng.
In PHP, if the actual parameter is smaller than the formal parameter, an error will be reported because there are parameters that are defined but not used. This may affect the function of the function in the PHP interpretation mechanism.
8. Variable value transfer methods are different: In
#js, the value transfer and address transfer of variables are determined based on the type of the object being passed. You can control it as you wish;
All types in PHP can freely control whether the value is passed by value or by address. Adding & before the variable can become the address method, and without adding &, it can be the value method. .
9. The core functions of the two are different:
The core function in php is implemented using functions, for example, getting the length of a string: $length = strlen(str)
;
and js is implemented using object methods, such as getting the length of a string: var length = str.length
.
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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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