You may access uploaded files using the file() method or using dynamic properties ($request->field_name).
$file = $request->file('photo');
//Or:
$file = $request->photo;

Checking if a file for upload

You may determine if a file is present on the request using the hasFile() method.
In addition to checking if the file is present, you can also check whether the file was successfully received by using the isValid() method
if($request->hasFile('photo') && $request->file('photo')->isValid('photo')){
  //
}

UploadedFile class instance

The file() method returns an instance of the Illuminate\Http\UploadedFile class (which extends the PHP SplFileInfo class), and provides a variety of methods to inspect and interact with the file.
For more information regarding these methods, check out the UploadedFile class methods

- Example, simple Laravel script to upload images, with setings for maximum allowed file size and file extension validation.

1. Create an "uploads" folder in the "public/" directory.
2. Add the following code in a "UploadController.php" file (in app/Http/Controllers/ directory):
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;

class UploadController extends Controller {
  protected $exts =['bmp', 'gif', 'jpe', 'jpeg', 'jpg', 'png']; //allowed file exttensions
  protected $max_size =0.5; //allowed maximum file size in MB
  protected $dir ='uploads'; //folder for uploaded files (in public/ directory)
  protected $err =[]; //store errors

  //Responds to post requests to /upload/photo
  //receives the $request instance
  //return string
  public function uploadPhoto(Request $request){
    //if file is sent
    if($request->hasFile('photo')){
      $file = $request->file('photo');

      //if file successfully received
      if($file->isValid()){
        //validate the file
        $ext = $file->guessExtension();
        $size = $file->getClientSize();
        if(!in_array($ext, $this->exts)) $this->err[] ='File extension: '. $ext .'<br>Allowed file exttensions: '. implode(', ', $this->exts);
        if($size >$this->max_size*1024*1024) $this->err[] ='File extension: '. $size .'<br>Allowed maximum file size: '. $this->max_size .' MB';

        //if no error, move the file
        if(count($this->err)==0){
          $fname = $file->getClientOriginalName();
          $fmoved = $file->move(base_path() .'/public/'. $this->dir, $fname);

          //if successfully moved in uploads directory
          if($fmoved){
            return 'File successfully uploaded:<br>'. $this->dir .'/'. $fname .'<br><img src="/'. $this->dir .'/'. $fname .'" alt="Photo" />';
          }
          else $this->err[] ='Unable to move the file to: '. $this->dir .'/'. $fname;
        }
      }
      else $this->err[] ='The file not received';
    }
    else $this->err[] ='No photo file';

    if(count($this->err) >0) return implode('<br>', $this->err);
  }
}
3. Add the following code in a file "upload_form.blade.php" (in the "resources/views/" folder):
<h4>Upload Photo<h4>
<form method="post" action="/upload/photo" enctype="multipart/form-data">
{{ csrf_field() }}
File: <input type='file' name='photo'/><br>
<input type='submit' value='Upload'/>
</form>
4. Add the this code in the "routes/web.php" file:
//shows the upload form
Route::name('upload')->get('/upload', function(){
  return view('upload_form');
});

//when the upload form is submited
Route::post('/upload/photo', 'UploadController@uploadPhoto');
5. Visit the following URL, and select a file for upload:
//localhost:8000/upload
- It will display a page like in this image:
laravel upload form
6. Click Upload button, it will open a page with the uploaded image, as shown in the following image:
laravel uploaded file

Another Upload Image example is to this Page: //coursesweb.net/laravel/validation#anc_pex
- The Upload-form contains Title and Descripton fields, and it uses Laravel validation model.

Another way to save the uploaded files on server is to use the store('folder') or storeAs('folder', 'file_name.ext') method.
These methods store the files in the specified "folder" in the "storage/app" directory.
The store() method automatically generate a unique ID for the file name.
The storeAs() method receives a second argument for the name of the file.
- Example:
//store the uploaded 'photo' file in storage/app/uploads/

//with a unique generated name
$path = $request->photo->store('uploads');
echo $path; // uploads/wAwyYljmEkjHaucksuHM2luPiyUMNApmKrt1L3LK.png

//with the original file name
$fname = $request->photo->getClientOriginalName();
$path = $request->photo->storeAs('uploads', $fname);
echo $path; // uploads/image.png

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which tag is used to add lists into <ul> and <ol> elements?
<dt> <dd> <li>
<ul>
 <li>http://coursesweb.net/html/</li>
 <li>http://coursesweb.net/css/</li>
</ul>
Which value of the "display" property creates a block box for the content and ads a bullet marker?
block list-item inline-block
.some_class {
  display: list-item;
}
Which instruction converts a JavaScript object into a JSON string.
JSON.parse() JSON.stringify eval()
var obj = {
 "courses": ["php", "javascript", "ajax"]
};
var jsonstr = JSON.stringify(obj);
alert(jsonstr);    // {"courses":["php","javascript","ajax"]}
Indicate the PHP class used to work with HTML and XML content in PHP.
stdClass PDO DOMDocument
$strhtml = '<body><div id="dv1">CoursesWeb.net</div></body>';
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById("dv1");
echo $elm->nodeValue;    // CoursesWeb.net
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