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  • Php Image Resize

    image resize:

    代码
    function my_image_resize($src_file, $dst_file, $dst_width=32, $dst_height=32) {
    if($dst_width <1 || $dst_height <1) {
    echo "params width or height error !";
    exit();
    }
    if(!file_exists($src_file)) {
    echo $src_file . " is not exists !";
    exit();
    }

    $type=exif_imagetype($src_file);
    $support_type=array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF);

    if(!in_array($type, $support_type,true)) {
    echo "this type of image does not support! only support jpg , gif or png";
    exit();
    }

    switch($type) {
    case IMAGETYPE_JPEG :
    $src_img=imagecreatefromjpeg($src_file);
    break;
    case IMAGETYPE_PNG :
    $src_img=imagecreatefrompng($src_file);
    break;
    case IMAGETYPE_GIF :
    $src_img=imagecreatefromgif($src_file);
    break;
    default:
    echo "Load image error!";
    exit();
    }
    $src_w=imagesx($src_img);
    $src_h=imagesy($src_img);
    $ratio_w=1.0 * $dst_width/$src_w;
    $ratio_h=1.0 * $dst_height/$src_h;
    if ($src_w<=$dst_width && $src_h<=$dst_height) {
    $x = ($dst_width-$src_w)/2;
    $y = ($dst_height-$src_h)/2;
    $new_img=imagecreatetruecolor($dst_width,$dst_height);
    imagecopy(
    $new_img,$src_img,$x,$y,0,0,$dst_width,$dst_height);
    switch($type) {
    case IMAGETYPE_JPEG :
    imagejpeg(
    $new_img,$dst_file,100);
    break;
    case IMAGETYPE_PNG :
    imagepng(
    $new_img,$dst_file);
    break;
    case IMAGETYPE_GIF :
    imagegif(
    $new_img,$dst_file);
    break;
    default:
    break;
    }
    }
    else {
    $dstwh = $dst_width/$dst_height;
    $srcwh = $src_w/$src_h;
    if ($ratio_w <= $ratio_h) {
    $zoom_w = $dst_width;
    $zoom_h = $zoom_w*($src_h/$src_w);
    }
    else {
    $zoom_h = $dst_height;
    $zoom_w = $zoom_h*($src_w/$src_h);
    }

    $zoom_img=imagecreatetruecolor($zoom_w, $zoom_h);
    imagecopyresampled(
    $zoom_img,$src_img,0,0,0,0,$zoom_w,$zoom_h,$src_w,$src_h);
    $new_img=imagecreatetruecolor($dst_width,$dst_height);
    $x = ($dst_width-$zoom_w)/2;
    $y = ($dst_height-$zoom_h)/2+1;
    imagecopy(
    $new_img,$zoom_img,$x,$y,0,0,$dst_width,$dst_height);
    switch($type) {
    case IMAGETYPE_JPEG :
    imagejpeg(
    $new_img,$dst_file,100);
    break;
    case IMAGETYPE_PNG :
    imagepng(
    $new_img,$dst_file);
    break;
    case IMAGETYPE_GIF :
    imagegif(
    $new_img,$dst_file);
    break;
    default:
    break;
    }
    }
    }

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  • 原文地址:https://www.cnblogs.com/Jekhn/p/1936608.html
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