ldc-dam/app/Http/Traits/MediaTools.php

<?php
namespace App\Http\Traits;
use Illuminate\Support\Facades\Storage;

trait MediaTools {

	public  function get_file_size($file_path) {

		return $this->fix_integer_overflow(filesize($file_path));
	}

	public  function get_mediaFolder() {
		$mediaPath = "medias/";
		$directories = Storage::allDirectories($mediaPath );
		$selectedFolder = "";

		// on obtient le dernier dossier créé
		foreach ($directories as $key => $foldername) {
			if($selectedFolder < $foldername){
				$selectedFolder = $foldername;
			}
		}
		// si on n'a pas de dossier, on le créé
		if($selectedFolder == ""){
			$selectedFolder = $mediaPath.uniqid();
			Storage::makeDirectory($selectedFolder);
		}else{
			// on compte le nombre de fichier
			$files = Storage::allFiles($selectedFolder);
			// si on en a plus de 1000, on créé un nouveau dossier
			if(count($files)> 1000){
				$selectedFolder = $mediaPath.uniqid();
				Storage::makeDirectory($selectedFolder);
			}
		}
		return $selectedFolder;
	}

	public  function fix_integer_overflow($size) {
		if ($size < 0) {
			$size += 2.0 * (PHP_INT_MAX + 1);
		}
		return $size;
	}

	public function formatBytes($octet, $precision = 2) {
		// Array contenant les differents unités
       $unite = array('octet','Ko','Mo','Go');

       if ($octet < 1000) // octet
       {
           return $octet.$unite[0];
       }
       else
       {
           if ($octet < 1000000) // ko
           {
               $ko = round($octet/1024,2);
               return $ko.$unite[1];
           }
           else // Mo ou Go
           {
               if ($octet < 1000000000) // Mo
               {
                   $mo = round($octet/(1024*1024),2);
                   return $mo.$unite[2];
               }
               else // Go
               {
                   $go = round($octet/(1024*1024*1024),2);
                   return $go.$unite[3];
               }
           }
       }
	}

	public  function get_dpi($filename){

	    // open the file and read first 20 bytes.
	    $a = fopen($filename,'r');
	    $string = fread($a,20);
	    fclose($a);

	    // get the value of byte 14th up to 18th
	    $data = bin2hex(substr($string,14,4));
	    $x = substr($data,0,4);
	    $y = substr($data,4,4);
	    //return array(hexdec($x),hexdec($y));
		return hexdec($x);
	}


	/**
	 * @param $src - a valid file location
	 * @param $dest - a valid file target
	 * @param $targetWidth - desired output width
	 * @param $targetHeight - desired output height or null
	 */
	function createThumbnail($src, $dest, $targetWidth, $targetHeight = null) {



		// Link image type to correct image loader and saver
		// - makes it easier to add additional types later on
		// - makes the function easier to read
		$IMAGETYPE_JPEG = 2;
		$IMAGETYPE_PNG = 3;
		$IMAGETYPE_GIF = 1;
		$IMAGE_HANDLERS = [
			2 => [
				'load' => 'imagecreatefromjpeg',
				'save' => 'imagejpeg',
				'quality' => 50
			],
			3 => [
				'load' => 'imagecreatefrompng',
				'save' => 'imagepng',
				'quality' => 5
			],
			1 => [
				'load' => 'imagecreatefromgif',
				'save' => 'imagegif',
				'quality' => 0
			]
		];

	    // 1. Load the image from the given $src
	    // - see if the file actually exists
	    // - check if it's of a valid image type
	    // - load the image resource

	    // get the type of the image
	    // we need the type to determine the correct loader
	    $type = exif_imagetype($src);

	    // if no valid type or no handler found -> exit
	    if (!$type || !$IMAGE_HANDLERS[$type]) {
	        return null;
	    }

	    // load the image with the correct loader
	    $image = call_user_func($IMAGE_HANDLERS[$type]['load'], $src);

	    // no image found at supplied location -> exit
	    if (!$image) {
	        return null;
	    }


	    // 2. Create a thumbnail and resize the loaded $image
	    // - get the image dimensions
	    // - define the output size appropriately
	    // - create a thumbnail based on that size
	    // - set alpha transparency for GIFs and PNGs
	    // - draw the final thumbnail

	    // get original image width and height
	    $width = imagesx($image);
	    $height = imagesy($image);

	    // maintain aspect ratio when no height set
	    if ($targetHeight == null) {

	        // get width to height ratio
	        $ratio = $width / $height;

	        // if is portrait
	        // use ratio to scale height to fit in square
	        if ($width > $height) {
	            $targetHeight = floor($targetWidth / $ratio);
	        }
	        // if is landscape
	        // use ratio to scale width to fit in square
	        else {
	            $targetHeight = $targetWidth;
	            $targetWidth = floor($targetWidth * $ratio);
	        }
	    }

	    // create duplicate image based on calculated target size
	    $thumbnail = imagecreatetruecolor($targetWidth, $targetHeight);

	    // set transparency options for GIFs and PNGs
	    if ($type == $IMAGETYPE_GIF || $type == $IMAGETYPE_PNG) {

	        // make image transparent
	        imagecolortransparent(
	            $thumbnail,
	            imagecolorallocate($thumbnail, 0, 0, 0)
	        );

	        // additional settings for PNGs
	        if ($type == $IMAGETYPE_PNG) {
	            imagealphablending($thumbnail, false);
	            imagesavealpha($thumbnail, true);
	        }
	    }

	    // copy entire source image to duplicate image and resize
	    imagecopyresampled(
	        $thumbnail,
	        $image,
	        0, 0, 0, 0,
	        $targetWidth, $targetHeight,
	        $width, $height
	    );


	    // 3. Save the $thumbnail to disk
	    // - call the correct save method
	    // - set the correct quality level

	    // save the duplicate version of the image to disk
	    return call_user_func(
	        $IMAGE_HANDLERS[$type]['save'],
	        $thumbnail,
	        $dest,
	        $IMAGE_HANDLERS[$type]['quality']
	    );
	}

}