PHP dynamic processing picture after output display

PHP dynamically change the image size after output, the output image using the following address: Image_resize.php?img=image.jpg&w=150&h=150&constrain=1 W and H are the dimensions to be displayed 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 was resized by it ' s Value in percent (i.e. divide by percent) w = Image Width H = Image Height Constrain = If this is parameter was 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 $h = (+/($SW/$w)) *. 01; $h = @round ($sh * $h); } elseif (Isset ($h) and!isset ($w)) { Autocompute width If only height is set $w = (+/($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 is set and $constrain is also set $HX = (+/($SW/$w)) *. 01; $HX = @round ($sh * $hx); $WX = (+/($sh/$h)) *. 01; $WX = @round ($SW * $wx); if ($hx < $h) { $h = (+/($SW/$w)) *. 01; $h = @round ($sh * $h); } else { $w = (+/($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); } ?> Copy Code

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