Crop Thumbnail Image Function Tutorial jpg gif png

Learn how to script a universal PHP image crop function that runs inline with our resize function created in the previous lesson. It uses a handful of functions from the GD library in PHP. In our example the function will work for cropping JPG, GIF, and PNG type of images universally. my_file.php <form enctype="multipart/form-data" method="post" action="image_upload_script.php"> Choose your file here: <input name="uploaded_file" type="file"/><br /><br /> <input type="submit" value="Upload It"/> </form> image_upload_script.php <?php // Access the $_FILES global variable for this specific file being uploaded // and create local PHP variables from the $_FILES array of information $fileName = $_FILES["uploaded_file"]["name"]; // The file name $fileTmpLoc = $_FILES["uploaded_file"]["tmp_name"]; // File in the PHP tmp folder $fileType = $_FILES["uploaded_file"]["type"]; // The type of file it is $fileSize = $_FILES["uploaded_file"]["size"]; // File size in bytes $fileErrorMsg = $_FILES["uploaded_file"]["error"]; // 0 for false... and 1 for true $kaboom = explode(".", $fileName); // Split file name into an array using the dot $fileExt = end($kaboom); // Now target the last array element to get the file extension // START PHP Image Upload Error Handling -------------------------------------------------- if (!$fileTmpLoc) { // if file not chosen echo "ERROR: Please browse for a file before clicking the upload button."; exit(); } else if($fileSize > 5242880) { // if file size is larger than 5 Megabytes echo "ERROR: Your file was larger than 5 Megabytes in size."; unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder exit(); } else if (!preg_match("/.(gif|jpg|png)$/i", $fileName) ) { // This condition is only if you wish to allow uploading of specific file types echo "ERROR: Your image was not .gif, .jpg, or .png."; unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder exit(); } else if ($fileErrorMsg == 1) { // if file upload error key is equal to 1 echo "ERROR: An error occured while processing the file. Try again."; exit(); } // END PHP Image Upload Error Handling --------------------------------- // Place it into your "uploads" folder mow using the move_uploaded_file() function $moveResult = move_uploaded_file($fileTmpLoc, "uploads/$fileName"); // Check to make sure the move result is true before continuing if ($moveResult != true) { echo "ERROR: File not uploaded. Try again."; unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder exit(); } unlink($fileTmpLoc); // Remove the uploaded file from the PHP temp folder // ---------- Include Adams Universal Image Resizing Function -------- include_once("ak_php_img_lib_1.0.php"); $target_file = "uploads/$fileName"; $resized_file = "uploads/resized_$fileName"; $wmax = 300; $hmax = 300; ak_img_resize($target_file, $resized_file, $wmax, $hmax, $fileExt); // ----------- End Adams Universal Image Resizing Function ---------- // ------ Start Adams Universal Image Thumbnail(Crop) Function ------ $target_file = "uploads/resized_$fileName"; $thumbnail = "uploads/thumb_$fileName"; $wthumb = 150; $hthumb = 150; ak_img_thumb($target_file, $thumbnail, $wthumb, $hthumb, $fileExt); // ------- End Adams Universal Image Thumbnail(Crop) Function ------- // Display things to the page so you can see what is happening for testing purposes echo "The file named <strong>$fileName</strong> uploaded successfuly.<br /><br />"; echo "It is <strong>$fileSize</strong> bytes in size.<br /><br />"; echo "It is an <strong>$fileType</strong> type of file.<br /><br />"; echo "The file extension is <strong>$fileExt</strong><br /><br />"; echo "The Error Message output for this upload is: $fileErrorMsg"; ?> ak_php_img_lib_1.0.php <?php // -------------- RESIZE FUNCTION ------------- // Function for resizing any jpg, gif, or png image files function ak_img_resize($target, $newcopy, $w, $h, $ext) { list($w_orig, $h_orig) = getimagesize($target); $scale_ratio = $w_orig / $h_orig; if (($w / $h) > $scale_ratio) { $w = $h * $scale_ratio; } else { $h = $w / $scale_ratio; } $img = ""; $ext = strtolower($ext); if ($ext == "gif"){ $img = imagecreatefromgif($target); } else if($ext =="png"){ $img = imagecreatefrompng($target); } else { $img = imagecreatefromjpeg($target); } $tci = imagecreatetruecolor($w, $h); // imagecopyresampled(dst_img, src_img, dst_x, dst_y, src_x, src_y, dst_w, dst_h, src_w, src_h) imagecopyresampled($tci, $img, 0, 0, 0, 0, $w, $h, $w_orig, $h_orig); if ($ext == "gif"){ imagegif($tci, $newcopy); } else if($ext =="png"){ imagepng($tci, $newcopy); } else { imagejpeg($tci, $newcopy, 84); } } // ------------- THUMBNAIL (CROP) FUNCTION ------------- // Function for creating a true thumbnail cropping from any jpg, gif, or png image files function ak_img_thumb($target, $newcopy, $w, $h, $ext) { list($w_orig, $h_orig) = getimagesize($target); $src_x = ($w_orig / 2) - ($w / 2); $src_y = ($h_orig / 2) - ($h / 2); $ext = strtolower($ext); $img = ""; if ($ext == "gif"){ $img = imagecreatefromgif($target); } else if($ext =="png"){ $img = imagecreatefrompng($target); } else { $img = imagecreatefromjpeg($target); } $tci = imagecreatetruecolor($w, $h); imagecopyresampled($tci, $img, 0, 0, $src_x, $src_y, $w, $h, $w, $h); if ($ext == "gif"){ imagegif($tci, $newcopy); } else if($ext =="png"){ imagepng($tci, $newcopy); } else { imagejpeg($tci, $newcopy, 84); } } ?>

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Introduction to PHP Image ProcessingImage Processing LibrariesCheck GD Library Version and Test Copy Image RotateBuild an Image Upload Application to Enable Working With Images On the FlyImage Resize Function Tutorial jpg gif png Change SizeCrop Thumbnail Image Function Tutorial jpg gif pngImage Filter Name Rename Upload TutorialImage Convert Type Function Upload TutorialImage Watermark Function How To Add On the Fly Tutorial
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