Question

如何调整图像大小并减小其文件大小？

这是我的用于减小图像文件大小的代码，该代码可以正常工作：

<!DOCTYPE html>
<html>
<?PHP
if(isset($_POST["submit"]))
{
    include("connect.php");
    // created compressed JPEG file from source file
    function compressImage($source_image, $compress_image) {
        $image_info = getimagesize($source_image);  
        if ($image_info['mime'] == 'image/jpeg') { 
            $source_image = imagecreatefromjpeg($source_image);
            imagejpeg($source_image, $compress_image, 75);
        } elseif ($image_info['mime'] == 'image/gif') {
            $source_image = imagecreatefromgif($source_image);
            imagegif($source_image, $compress_image, 75);
        } elseif ($image_info['mime'] == 'image/png') {
            $source_image = imagecreatefrompng($source_image);
            imagepng($source_image, $compress_image, 6);
        }       
        return $compress_image;
    }

    $upload_dir = "test/";          
    $new_image_name_rand_num = RAND(0,100);
    $new_image_name_rand_text = substr(str_shuffle('ABCDEFGHIJKLMNOPQRSTUVWXYZ23456789'),0,7);

    $image_name_new = $pet_ref_id."-".$new_image_name_rand_num."-".$new_image_name_rand_text;
    $temp = explode(".", $_FILES['pet_image']['name']);
    $newfilename = $image_name_new. '.' . end($temp);
    $upload_file = $upload_dir.$newfilename;


    if(move_uploaded_file($_FILES['pet_image']['tmp_name'],$upload_file))
    {
        $source_image = $upload_file;
        $image_destination = $upload_dir."".$newfilename;
        $compress_images = compressImage($source_image, $image_destination);
    }
}
?>

<form class="form" method="post" action="" ENCTYPE = "multipart/form-data">
<input name="pet_image" type="file"/>
<input type="submit" name="submit" value="OK">
</form>

</body>
</html>

但是当我像这样减小文件大小并重新调整图像大小时，既不会减小文件大小也不会调整图像大小。同时做这两项的正确方法是什么？

这是无法正常运行的组合代码：

<!DOCTYPE html>
<html>
<?PHP
if(isset($_POST["submit"]))
{
    include("connect.php");
    // created compressed JPEG file from source file
    function compressImage($source_image, $compress_image) {
        $image_info = getimagesize($source_image);  
        if ($image_info['mime'] == 'image/jpeg') { 
            $source_image = imagecreatefromjpeg($source_image);
            imagejpeg($source_image, $compress_image, 75);
        } elseif ($image_info['mime'] == 'image/gif') {
            $source_image = imagecreatefromgif($source_image);
            imagegif($source_image, $compress_image, 75);
        } elseif ($image_info['mime'] == 'image/png') {
            $source_image = imagecreatefrompng($source_image);
            imagepng($source_image, $compress_image, 6);
        }       
        return $compress_image;
    }


    function shazam($file, $w, $h) {
        list($width, $height) = getimagesize($file);

        if ($width > $height) {
            $r = ($w / $width);
            $newwidth = $w;
            $newheight = ceil($height * $r);
        } 

        if ($width < $height) {
            $r = ($h / $height);
            $newheight = $h;
            $newwidth = ceil($width * $r);
        } 

        if ($width == $height) {
            $newheight = $h;
            $newwidth = $w;
        }

        $src = imagecreatefromjpeg($file);
        $tgt = imagecreatetruecolor($newwidth, $newheight);
        imagecopyresampled($tgt, $src, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);

        return $tgt;
    }

    $upload_dir = "test/";          
    $new_image_name_rand_num = RAND(0,100);
    $new_image_name_rand_text = substr(str_shuffle('ABCDEFGHIJKLMNOPQRSTUVWXYZ23456789'),0,7);

    $image_name_new = $pet_ref_id."-".$new_image_name_rand_num."-".$new_image_name_rand_text;
    $temp = explode(".", $_FILES['pet_image']['name']);
    $newfilename = $image_name_new. '.' . end($temp);
    $upload_file = $upload_dir.$newfilename;


    if(move_uploaded_file($_FILES['pet_image']['tmp_name'],$upload_file))
    {     
        $source_image = shazam($upload_file, 850, 850);
        $image_destination = $upload_dir."".$newfilename;
        $compress_images = compressImage($source_image, $image_destination);
    }
}
?>



<form class="form" method="post" action="" ENCTYPE = "multipart/form-data">
<input name="pet_image" type="file"/>
<input type="submit" name="submit" value="OK">
</form>

</body>
</html>

如何缩小图像尺寸并一起调整图像尺寸以进行编码？

0 个答案: