The information technology industry, also known as the information industry, is an industry that uses information means and technology to collect, organize, store, and transmit information and intelligence, provide information services, and provide corresponding information means, information technology and other services. The information technology industry includes: industrial sectors engaged in the production, circulation and sale of information and the use of information to provide services.
Information Technology (IT is Information Technology) is sensing technology, communication technology, computer technology and control technology. Maybe you are not satisfied with this definition, but it is indeed a concise, specific, systematic and practical definition. (Recommended learning: PHP video tutorial)
Sensing technology is the technology to obtain information, communication technology is the technology to transmit information, computer technology is the technology to process information, and control technology is to utilize Information technology.
Therefore, this definition not only gives the content of information technology, but also clarifies the acquisition-delivery-processing-utilization system of information technology, and also clarifies the concepts of sensing, communication, computer, and control. The role and interrelationship of technology in information systems is relatively clear, the field is clear, and the public has a perceptual understanding.
Although the four major technologies of sensing, communication, computer and control perform their own duties in the information system, from the perspective of technical elements, they are mutually inclusive, intersecting, and mutually integrated. Sensing, communication, and computers are all inseparable from control; sensing, computers, and control are all inseparable from communication; sensing, communication, and control are even more inseparable from computers.
All useful data and materials for human social activities can be called information. Information in a broad sense includes not only information about enterprise production and operation activities, but also information about national economy and even world economic activities;
Includes not only economic information, but also scientific and technological information, social and cultural information, life information, etc. Information in a narrow sense mainly refers to micro and macroeconomic information related to enterprise production and operation activities.
Information means and information technology mainly refer to computer systems engaged in information processing, public opinion and communication tools engaged in information transmission, and corresponding information science theories. Therefore, the information technology industry refers to those engaged in the production, circulation and sale of information and corresponding information science theories.
Internet technology has three meanings, namely hardware, software and applications.
The first layer is hardware, which mainly refers to hosts and network communication equipment for data storage, processing and transmission;
The second layer refers to software, including data collection, storage, Various software for retrieving, analyzing, applying, and evaluating information, including what we usually refer to as ERP (Enterprise Resource Planning), CRM (Customer Relationship Management), SCM (Supply Chain Management) and other commercial management software, as well as software used to enhance WF (workflow) management software for process management, DW/DM (data warehouse and data mining) software for auxiliary analysis, etc.;
The third layer refers to application, which refers to collection, storage, retrieval, analysis, and application , Evaluate and use various information, including the application of ERP, CRM, SCM and other software to directly assist decision-making, and also include the use of other decision-making analysis models or technical means such as DW/DM to further improve the quality of analysis and assist decision-makers in making decisions (emphasis on one point , only assists rather than substitutes for human decision-making).
The above is the detailed content of What industry does php and front-end belong to?. For more information, please follow other related articles on the PHP Chinese website!

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。

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。

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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