PHP Upload image generation thumbnail (GD library) _php Tips

First to a simple PHP upload image to generate thumbnails of the detailed code, to share with you for your reference, the specific content as follows

<?php function Createthumbnail ($imageDirectory, $imageName, $thumbDirectory, $thumbWidth, $quality) {$details =
GetImageSize ("$imageDirectory/$imageName") or Die (' please upload images. ');
$type = Preg_replace (' @^.+ (? <=/) (. +) $@ ', ' $ ', $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 = $_files["Pictur
Es "] [" tmp_name "] [$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);
 Thumb width:: Thumb = Quality (1-100)}?>

Next, we recommend an example PHP use the GD library to upload pictures and create thumbnails, directly look at the code:

The GD library is a very powerful library of PHP for image manipulation.

First add one line to the php.ini:extension=php_gd2.dll

Restart Apache, do a test page var_dump (Gd_info ()); The output data indicates that the GD library reference was successful.

Picture upload page upload.html

Process Page upload_img.php

<?php
 //Upload image save address
 $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 file

  $dstW =200;//thumbnail width
  $dstH =200;//thumbnail high

  $src _image=imagecreatefromjpeg ($uploadfile);
  $srcW =imagesx ($src _image); Get picture width
  $srcH =imagesy ($src _image);//Get Picture high

  $dst _image=imagecreatetruecolor ($dstW, $dstH);
  Imagecopyresized ($dst _image, $src _image,0,0,0,0, $dstW, $dstH, $srcW, $srcH);
  Imagejpeg ($dst _image, $smallfile);

  echo ' File upload success <br> ';
  echo "

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