PHP 代表超文本处理器,被设计为用于开发 Web 应用程序的服务器端脚本语言。 PHP 代码主要与 HTML 语法结合或嵌入,但它可以用于 Web 应用程序的任何模板系统或可用的 Web 框架。
有很多 PHP 命令可用于各种环境,特别是用于准备一个 Web 应用程序或使用 HTML 语法嵌入整个服务器端代码库,并且对于普通开发人员来说非常容易学习。下面提到了一些基本的 PHP 命令:
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IF [SPECIFIC CONDITION]{ [CODE] }ELSE IF [SPECIFIC CONDITION 2]{ [CODE] }ELSE { [CODE] }
PHP 也使用 switch case,就像其他编程语言一样,以避免多个“IF ELSE”的嵌套定义。考虑多种情况的切换情况,定义默认值是可选的。定义 switch case 的代码结构如下:
SWITCH($var){ CASE 'val 1' [CODE] Break; CASE 'val 2' [CODE] Break; CASE 'val 3' [CODE] Break; DEFAULT [CODE] }
WHILE [condition or expression]{ [CODE] }
For(exp 1, exp 2, exp 3){ [CODE] }
DO { [CODE] }WHILE (condition)
FOREACH ($arr_var as $val){ [CODE] }
还有其他几个流行的 PHP 命令,它们也被 PHP 开发人员使用,它们不是非常基本的命令,但更多地与 PHP 配合使用。下面列出了一些中间 PHP 命令类型:
In PHP, INCLUDE is mainly using for appending define code in an external file with the current working file.
INCLUDE ('name of the external file')
Maximum business logic can be defined within this PHP function.
Function "name of the function" (argument1, argument2 …){ [CODE] Return "expected result"; }
Array is mainly holding multiple related information in a single variable. Three kinds of arrays PHP normally supported.
It is similar to the HTML form.
<form action="" name="" type="post">
However, some of the critical tasks often need to be performed by the users of the PHP command. These tasks also have some advanced commands to execute, such as storing the cookie value, redirecting the page to some relevant pages or connecting to the database. Those advance kind of PHP commands are below:
A cookie is mainly using storing some of the user type value in their own system so that it can come automatically for the same website.
setCiookie(ckname, ckvalue, ckexpire, ckpath, ckdomain, cksecure) >>> creating Cookie $_COOKIE['cookie name'] >>> get cookies value
Redirecting to a new page by below command:
Header("Location:'URL to redirect'");
Some common users who are very frequently using PHP commands, they normally use some of the tips and tricks for utilizing PHP commands output in a proper way. Those kinds of tricks normally solving some user-specific queries and display execution output for understanding the same properly. Some of the very commonly used key tricks are:
For little critical complexity of business logic, sometimes developer using huge ‘IF-ELSE’ condition which creates a real problem of understanding the logic and final review. So one of the popular operators in PHP for avoiding the same is the Ternary operator. It is something like if conditions are true then doing something, else fetching some default value.
$value = (!empty($_GET['val'])? $_GET['val']: 'ABC');
Somehow requirement of using some common files in multiple pages, In that case rather than mention those common files in every page, a developer can make one common header and mention those common classes on that header page.
PHP is now a very popular programming language which used by the maximum common web application. If an organization are not a big concern with the site security or code vulnerability then PHP will be always a good option. The population of a page in PHP is very fast rather than any programming language.
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