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Object Orient Programming: Image Class
Level: Beginner Software:
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In Part four of the Object Oriented tutorial, I share the code I use for my image class. In this class there are 4 function.
- One to Upload
- One to Resize
- One to get a file extenstion
- and One to resize on the fly
In order to use the resize function, you will need the gd 2 library. If you're not sure if you have this, create a php file, and place this code in it.
| phpinfo();
?> |
View the file, and search for gd. you can find more info on gd here
First the 82 lines of code that I call func_images.php
| class images {
function upload($Request_Name, $Img_Dir){ $Image = $_FILES[$Request_Name]['name']; $sub_Image = str_replace(" ", "_", $Image); //Make sure we dont overright a file $dir_arr = Array(); $handle = opendir("$Img_Dir"); while (false !== ($file = readdir($handle))) { if ($file != "." && $file != "..") { $dir_arr[] = $file; } } if(in_array("$sub_Image", $dir_arr)) { $_SESSION['Message'] = "$sub_Image Already exists"; return FALSE; } //Save Full Size Image $copy = copy ($_FILES[$Request_Name]['tmp_name'], "$Img_Dir".$sub_Image); if(!$copy) { $_SESSION['Message'] = "an image must be select"; return FALSE; } return $sub_Image; } function getExtension($filename){ $dot = substr (strrchr ($filename, "."), 1); return $dot; } function resize($Image, $Img_Dir, $width, $height, $mod_name = '', $target_dir = ''){ $ext = $this->getExtension($Image); if($ext != "jpg" && $ext != "jpeg" && $ext != "gif"){ $_SESSION['Message'] = "Only .jpg, .jpeg, and .gif are supported"; return FALSE; } $sourcefile = $Img_Dir . $Image; $imagesize = getimagesize("$sourcefile"); if($imagesize[0] > $width || $imagesize[1] > $width) { if ($imagesize[0] > $imagesize[1]) { $percentage = ($width / $imagesize[0]); } else { $percentage = ($height / $imagesize[1]); } $new_width = round($imagesize[0] * $percentage); $new_height = round($imagesize[1] * $percentage); $dest_x = $new_width; $dest_y = $new_height; if($target_dir != ''){ $targetfile = $target_dir . $mod_name . $Image; } else { $targetfile = $Img_Dir . $mod_name . $Image; } $jpegqual = 100; switch($ext){ case 'jpg' : case 'jpeg' : $source_id = imageCreatefromjpeg("$sourcefile"); break; case 'gif' : $source_id = imageCreatefromgif("$sourcefile"); break; } $target_id = imagecreatetruecolor($dest_x, $dest_y); $target_pic = imagecopyresampled ($target_id,$source_id,0,0,0,0,$dest_x,$dest_y,$imagesize[0],$imagesize[1]); imagejpeg ($target_id,"$targetfile",$jpegqual); } } function fly_resize($source, $width, $height) { $sourcefile = $source; $imagesize = getimagesize("$sourcefile"); if($imagesize[0] > $width || $imagesize[1] > $width) { if ($imagesize[0] > $imagesize[1]) { $percentage = ($width / $imagesize[0]); } else { $percentage = ($height / $imagesize[1]); } $size = array(); $size[0] = round($imagesize[0] * $percentage); $size[1] = round($imagesize[1] * $percentage); return $size; } } } ?> |
This code is written so you can copy it, and use it, without making any changes, which is what object is all about; code you can use anywhere without chaning it. You will need to know how to call each function, so I will explain that. Ill also break each function apart and give a break down of whats going on.
Ok lets look at the function
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