laravel HTTP request: get input information

Getting input in the laravel framework is very convenient. It provides a variety of methods to get input.

Use the Illuminate\Http\Request instance in laravel to accept requests, as follows

use Illuminate\Http\Request;

$request = new Request();
echo $request->method();

You can use a simple automatic injection method, use the following:

<?php
namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\Route;

class IndexController extends Controller
{
    public function index (Request $request)
    {
        dump($request->method());    
    }
}

Get the request path and request method

Getting the request method is very simple, just use the method method. In addition, there is a method to determine the current request action isMethod

if ($request->isMethod('post')) {
    // ...
}

There are several methods to obtain the request path, and there are differences between them. For example, for a URL address: http://example.com/ path1/path2?a=23&b=3, the values ​​that can be obtained by the three methods are as follows:

• path(): Get the path, path1/path2

• url(): Get the url address, but does not contain? and the following string. http://example.com/path1/path2

• fullUrl(): Get the full path. http://example.com/path1/path2?a=23&b=3

##Get input

below Get input from several aspects, such as getting all input or getting a single input to get part of the input, etc.

Get all input

There are two ways to get all input, all() and input(). Not adding any parameters to the input means accepting everything:

$request->all();
// or
$request->input();

Getting an input

Getting an input also uses

input Method, but the first parameter must be given, which represents the value of the field that needs to be obtained.

$request->input('name');

Input can also accept a second parameter, which is the default value set when the field value is not obtained. For example:

$request->input('name', 'php.cn');

In addition, input can also obtain numerical values ​​and json data. When obtaining, use the operator

"."

$request->input('users.name');
$request->input('users.0.name');
$request->input('users.*.name');

In addition to the input method, there are also There is a

query method that can also get input, but the difference between them is that input can get input from the form and query string, while the query method can only get input from the query string. The usage of the query method and the input method are the same, so they will not be demonstrated here.

There is also a simple method of obtaining input, called dynamically obtaining input, which can obtain input directly through attributes. For example, if the form contains a name field, you can obtain

$request->name;

through the following method. However, it should be noted that Laravel will first search for parameters in the request body. If the value does not exist, it is looked up from the route parameters.

Get a bool value

laravel provides a function that gets the field value and actively converts it to a bool type value. The method is boolean.

if ($request->boolean('name')) {
    // ...
}

Judge whether a value exists

There are several ways to judge whether an input value exists, and the usage is slightly different. Both

has and filled can be used to determine whether the input value exists, but the difference is: has returns true as long as the field value exists. And filled not only exists but also must not be empty to return true.

has can also be used to judge multiple fields. If multiple field values ​​exist, it returns true, otherwise it returns false

if ($request->has(['name', 'email'])) {}

And hasAny returns true if only one field value exists

if ($request->hasAny(['name', 'email'])) {}

Get partial input

Laravel can also get partial input, using only or except methods, their usage and functions are exactly the same. What is returned is an associative array:

$request->only('name', 'email');
// or
$request->only(['name', 'email']);

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