Php uploads an image to generate a thumbnail (GD Library), _ PHP Tutorial

Php uploads images to generate thumbnails (GD Library ),. Php uploads an image to generate a thumbnail (GD Library). First, let's take a simple php Upload image to generate a thumbnail for your reference, the specific content is as follows: phpfunction php uploads an image to generate a thumbnail (GD Library ),

First, let's take a simple php code to upload images to generate thumbnails for your reference. The details are as follows:

<?phpfunction createThumbnail($imageDirectory, $imageName, $thumbDirectory, $thumbWidth, $quality){$details = getimagesize("$imageDirectory/$imageName") or die('Please only upload images.');$type = preg_replace('@^.+(?<=/)(.+)$@', '$1', $details['mime']);eval('$srcImg = imagecreatefrom'.$type.'("$imageDirectory/$imageName");');$thumbHeight = $details[1] * ($thumbWidth / $details[0]);$thumbImg = imagecreatetruecolor($thumbWidth, $thumbHeight);imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $thumbWidth, $thumbHeight,$details[0], $details[1]);eval('image'.$type.'($thumbImg, "$thumbDirectory/$imageName"'.(($type=='jpeg')?', $quality':'').');');imagedestroy($srcImg);imagedestroy($thumbImg);}foreach ($_FILES["pictures"]["error"] as $key => $error) {if ($error == UPLOAD_ERR_OK) {$tmp_name = $_FILES["pictures"]["tmp_name"][$key];$name = $_FILES["pictures"]["name"][$key];move_uploaded_file($tmp_name, "data/$name");createThumbnail("/location/of/main/image", $name, "/location/to/store/thumb", 120, 80);//120 = thumb width :: 80 = thumb quality (1-100)}}?>

Next, we recommend a php instance to use the GD library to upload images and create thumbnails. you can view the code directly:

GD Library isPHP is a powerful library for image operations.

Add a line of reference in php. ini:Extension = php_gd2.dll

Restart apache and make a test page.Var_dump (gd_info ());Output data indicates that the GD database is referenced successfully.

Upload.html

 Upload imagesFile upload (only jpg images can be uploaded)

Processing page upload_img.php

<? Php // Save the uploaded image $ uploadfile = "upfiles /". $ _ FILES ['upfile'] ['name']; // Thumbnail save address $ smallfile = "upfiles/small _". $ _ FILES ['upfile'] ['name']; if ($ _ FILES ['upfile'] ['type']! = "Image/jpeg") {echo 'file type error ';} else {move_uploaded_file ($ _ FILES ['upfile'] ['tmp _ name'], $ uploadfile ); // upload a file $ dstW = 200; // The width of the thumbnail $ d…… = 200; // The height of the thumbnail $ src_image = ImageCreateFromJPEG ($ uploadfile); $ srcW = ImageSX ($ src_image ); // get the image width $ srcH = ImageSY ($ src_image); // get the image height $ dst_image = ImageCreateTrueColor ($ dstW, $ dsomething); ImageCopyResized ($ dst_image, $ src_image, 0, 0, 0, $ dstW, $ dsomething, $ srcW, $ srcH); ImageJpeg ($ dst_image, $ smallfile); echo 'file uploaded successfully
'; Echo "" ;}?>

I hope it will help you learn php programming. thank you for your support.

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Compile (GD Library), first of all, let's take a simple php Upload image to generate a detailed code for thumbnails, and share it with you for your reference. the specific content is as follows: phpfunction...