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This article introduces the relevant knowledge of "what are the forms of receiving parameters in PHP". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Referencing is a very important ability for a web language like PHP. After all, the data passed from the front-end form or asynchronous request must be obtained before it can be displayed interactively. Of course, this is also a necessary capability for all languages that can do web development. Today we will take a look at the various forms of PHP reference.

First, we need to prepare a static page, like this one, which provides a form with a GET parameter in the url:

Document name: phone: address (province): address (city): interest 1: interest 2: education 1: education 2: normal GET, _ GET, GET, _ POST / / normal GET, POST echo $_ GET ['show'],'' / / 1 echo $_ POST ['name'],'; / / submitted

This is the most basic and direct way to access parameters. The GET parameter is obtained by GET, the POST parameter is obtained by _ GET, the POST parameter is obtained by GET, and the POST parameter is obtained by _ POST, which does not interfere with each other.

Normal $_ REQUEST method / / use REQUEST echo $_ REQUEST ['show'],''; / 1 echo $_ REQUEST ['tel'],''; / / submitted content

REQUEST is used to get the parameters in all requests, excluding uploading files. In other words, it contains _ REQUEST to get the parameters in all requests, not including uploading files. In other words, it contains REQUEST to get the parameters in all requests, not including uploading files. That is, it contains everything in the three parameters, _ GET, POST, and _ POST, as well as POST and _ COOKIE (to be configured, not included by default). It should be noted that after PHP5.3, the parameter variables accepted by $_ REQUEST are specified by request_order in the php.ini file. By default, the values of this configuration parameter are GP, that is, GET and POST, and there is no COOKIE. If you want to COOKIE, you need to modify it and add a C here.

What if there is something with the same name in GET, _ GET, GET, _ POST? The order of $_ REQUEST is also shown according to the order of the configuration parameters, from left to right, and the latter overrides the front. For example, if you configure GP, the order of parameter coverage is: POST > GET, and the final display is the content of the POST.

Register_globals problem / / register_globals if you open echo $name,''; / submitted content echo $tel,''; / / submitted content

This is an insecure configuration and is also configured in the php.ini file. Its function is to directly convert the requested parameters into variables, there is the problem of global variable pollution, do not open! Today's php.ini files are basically turned off by default.

Import_request_variables / / import_request_variables Sorry, import_request_variables ('pg',' pg_') has been cancelled since 5. 4; echo $pg_show,'; echo $pg_name,''

This function manually registers the contents of the specified parameter variable as a global variable, similarly, it is also cancelled after 5.4, such a function will be risky, we can see that there has been such a function.

Extract extract ($_ POST, EXTR_PREFIX_ALL, 'ex'); echo $ex_name,''; / / submitted echo $ex_tel,''; / / submitted content

Extract is currently supported in ways that can replace the above two parameter changes. It is up to us to control the coverage of existing variables, that is, the second parameter, so that the problem of polluting global variables can be greatly avoided in a controllable environment. Of course, the premise is that we have to make sure to use it. Specific content can find their own documentation reference oh!

In the parameter name. And the space / / parameter name. And spaces echo $_ REQUEST ['address_prov'],''; / / submitted content echo $_ REQUEST ['address_city'],''; / / submitted content

If the name of the input submitted by the form contains. Or spaces, which will be converted directly to underscores. However, we do not recommend it in front-end naming. Or spaces, just use underscores when needed, and don't cause ambiguity at the front and back ends.

[] print_r in the parameter name [] / / parameter name [] print_r ($_ REQUEST ['interest']); / / Array (vMagne....) Echo'; print_r ($_ REQUEST ['edu']); / / Array.

When the name of the input submitted by the form is in the form of an array, that is, in the form of "interest []" or "edu [one]", the parameters we receive become an array by default.

Fancy php://input / / php://input $content = file_get_contents ('php://input'); print_r ($content); / / name=xxx&.

Finally, there is the php://input format that is often used in interface development. Generally, because of security or a large number of parameter fields, the front end directly passes a whole piece of Body content in the form of Body Raw. At this time, it can only be obtained in this form. The original content of the Body Raw is usually a whole paragraph of text, or it may be content that has been encrypted, and the format can be defined by yourself. In the face of a normal form, we will receive the original form content, like the name=xxx&tel=xxx&.... above. This kind of content.

It is important to note that it cannot get the content when enctype= "multipart/form-data". At the same time, this method is also instead of the $HTTP_RAW_POST_DATA global variable, do not use the obsolete ability, update the new version of PHP as soon as possible and use the new syntax features!

Summary

It is really eye-opening to find that there are so many forms and places that need to be paid attention to in a simple pick-up. It is still the same sentence, endless learning, continue to study deeply sooner or later you will also become Daniel!

Test the code:

Document name: phone: address (province): address (city): interest 1: interest 2: interest 3: education 1: education 2: what are the forms of receiving parameters in PHP? thank you for your reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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