PHP zoom processing png and JPG images

This example shows the use of PHP's own GD library to zoom in and out of PNG and JPG images

$target _width = 120;   Target image width $target_height = 150;     Target image Height $target_img = ' me.jpg '; Cut picture Deal ($target _width, $target _height, $target _img);/** * Get picture information, prepare parameters */function deal ($target _width, $target _  Height, $target _img) {$img _info=getimagesize ($target _img);       Get the original size $original _width= $img _info[0];       Original picture width $original _height= $img _info[1];    Original image height $original _mime= $img _info[' mime ');       $type =substr ($original _mime,6); The original $original_mime value is ' image/type ', the image type is obtained by capturing from the sixth character $target _scale = $target _height/$target _width; The aspect ratio of the target image $original _scale = $original _height/$original _width;        The original picture aspect ratio if ($original _scale>= $target _scale) {//too high $w = Intval ($src _w);        $h = intval ($target _scale* $w);        $x = 0;    $y = ($original _height-$h)/3;        } else {//over-width $h = intval ($original _height);        $w = Intval ($h/$target _scale);        $x = ($original _width-$w)/2;    $y = 0; } switch ($type) {case 'JPEG ': dealjpg ($target _img, $w, $h, $x, $y, $original _width, $original _height, $target _width, $target _height);        Break Case ' png ': dealpng ($target _img, $w, $h, $x, $y, $original _width, $original _height, $target _width, $target _heigh            T);        Break            Default:echo "Please confirm that you need to handle the correct image type";    Break }}/** * processing jpg */function dealjpg ($target _img, $w, $h, $x, $y, $original _width, $original _height, $target _width, $target _he  ight) {//Trim $source =imagecreatefromjpeg ($target _img);      Create a new Image $croped =imagecreatetruecolor ($w, $h); Create a new True color image imagecopy ($croped, $source, 0, 0, $x, $y, $original _width, $original _height);    Copy part of image//Zoom $scale = $target _width/$w;   $target = Imagecreatetruecolor ($target _width, $target _height);    Create a new True color image $final _w = intval ($w * $scale);    $final _h = intval ($h * $scale);    Imagecopyresampled ($target, $croped, 0, 0, 0, 0, $final _w, $final _h, $w, $h); Resample copy part of image and resize//Save $timestamp = time ();    Imagejpeg ($target, "$timestamp. jpg"); Imagedestroy ($target);} /** * Handles PNG */function dealpng ($target _img, $w, $h, $x, $y, $original _width, $original _height, $target _width, $target _    Height) {//Trim $source =imagecreatefrompng ($target _img);      $croped =imagecreatetruecolor ($w, $h); Create a new True color image imagecopy ($croped, $source, 0, 0, $x, $y, $original _width, $original _height);    Copy part of image//Zoom $scale = $target _width/$w;   $target = Imagecreatetruecolor ($target _width, $target _height);    Create a new True color image $final _w = intval ($w * $scale);    $final _h = intval ($h * $scale);    Imagecopyresampled ($target, $croped, 0, 0, 0, 0, $final _w, $final _h, $w, $h);    Resample copy part of image and resize/save $timestamp = time ();    Imagepng ($target, "$timestamp. png"); Imagedestroy ($target);}

　　

PHP zoom processing png and JPG images