php動態處理圖片後輸出顯示

php動態改變圖片尺寸後輸出，輸出圖片時使用下面的地址： image_resize.php?img=image.jpg&w=150&h=150&constrain=1 w和h為要顯示的尺寸 header ("Content-type: image/jpeg"); /* JPEG / PNG Image Resizer Parameters (passed via URL): img = path / url of jpeg or png image file percent = if this is defined, image is resized by it's value in percent (i.e. 50 to divide by 50 percent) w = image width h = image height constrain = if this is parameter is passed and w and h are set to a size value then the size of the resulting image is constrained by whichever dimension is smaller Requires the PHP GD Extension Outputs the resulting image in JPEG Format By: Michael John G. Lopez - www.sydel.net Filename : imgsize.php */ $img = $_GET['img']; $percent = $_GET['percent']; $constrain = $_GET['constrain']; $w = $_GET['w']; $h = $_GET['h']; // get image size of img $x = @getimagesize($img); // image width $sw = $x[0]; // image height $sh = $x[1]; if ($percent > 0) { // calculate resized height and width if percent is defined $percent = $percent * 0.01; $w = $sw * $percent; $h = $sh * $percent; } else { if (isset ($w) AND !isset ($h)) { // autocompute height if only width is set $h = (100 / ($sw / $w)) * .01; $h = @round ($sh * $h); } elseif (isset ($h) AND !isset ($w)) { // autocompute width if only height is set $w = (100 / ($sh / $h)) * .01; $w = @round ($sw * $w); } elseif (isset ($h) AND isset ($w) AND isset ($constrain)) { // get the smaller resulting image dimension if both height // and width are set and $constrain is also set $hx = (100 / ($sw / $w)) * .01; $hx = @round ($sh * $hx); $wx = (100 / ($sh / $h)) * .01; $wx = @round ($sw * $wx); if ($hx < $h) { $h = (100 / ($sw / $w)) * .01; $h = @round ($sh * $h); } else { $w = (100 / ($sh / $h)) * .01; $w = @round ($sw * $w); } } } $im = @ImageCreateFromJPEG ($img) or // Read JPEG Image $im = @ImageCreateFromPNG ($img) or // or PNG Image $im = @ImageCreateFromGIF ($img) or // or GIF Image $im = false; // If image is not JPEG, PNG, or GIF if (!$im) { // We get errors from PHP's ImageCreate functions... // So let's echo back the contents of the actual image. readfile ($img); } else { // Create the resized image destination $thumb = @ImageCreateTrueColor ($w, $h); // Copy from image source, resize it, and paste to image destination @ImageCopyResampled ($thumb, $im, 0, 0, 0, 0, $w, $h, $sw, $sh); // Output resized image @ImageJPEG ($thumb); } ?> 複製代碼

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