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サーバー側に有効な画像ファイルを作成するPHPスクリプトがあります。次のコードは正常に動作：PHPで文字列を画像に変換する
$filename = $_GET['filename'];
// Only proceed if we got valid input
if ($filename !== null) {
echo "$filename is not null.";
$image = @imagecreatetruecolor(10, 10)
or die('Cannot Initialize new GD image stream');
if (strpos($image, '/gif') !== false) {
$image_type = "GIF";
header('Content-Type: image/gif');
$successful = imagegif($image, "./$filename");
} else if (strpos($image, '/jpeg') !== false) {
$image_type = "JPG";
header('Content-Type: image/jpeg');
$successful = imagejpeg($image, "./$filename");
} else if (strpos($image, '/png') !== false) {
$image_type = "PNG";
header('Content-Type: image/png');
$successful = imagepng($image, "./$filename");
}
if ($successful) {
echo "Image written to '$filename'.";
} else {
echo "Could not write $image_type image to '$filename'.";
}
imagedestroy($image);
echo "image destroyed.";
} else {
echo "$filename is null.";
}
これは、$ファイル名と&精細な画像が作成され動作します。しかし、実際には、ファイル名だけでなく画像も受信する必要があります。だから、私はから作成することができますどのように実際のコードは
$filename = $_GET['filename'];
$image = $_GET['image'];
echo "file $filename = '$image'.";
// Only proceed if we got valid input
if ($filename !== null) {
echo "$filename is not null.";
if (strpos($image, '/gif') !== false) {
$image_type = "GIF";
header('Content-Type: image/gif');
$successful = imagegif($image, "./$filename");
} else if (strpos($image, '/jpeg') !== false) {
$image_type = "JPG";
header('Content-Type: image/jpeg');
$successful = imagejpeg($image, "./$filename");
} else if (strpos($image, '/png') !== false) {
$image_type = "PNG";
header('Content-Type: image/png');
$successful = imagepng($image, "./$filename");
}
if ($successful) {
echo "Image written to '$filename'.";
} else {
echo "Could not write $image_type image to '$filename'.";
}
imagedestroy($image);
echo "image destroyed.";
} else {
echo "$filename is null.";
}
これは動作しませんが、結果は
file t.png = 'data:image/jpeg;base64,/9j/4AAQSkZJ … qA/Cz//Z'.t.png is not null.Image written to 't.png'.image destroyed.
です「データ：画像/ JPEGを...」文字列がPHPで有効なイメージ？
EDIT 1：それはanother questionの可能重複しないことを確認するために上記のコード1つの行を追加：
// Only proceed if we got valid input
if ($filename !== null) {
echo "$filename is not null.";
$image = base64_decode($image); // <<<<
EDIT 2：ファイルであるように、私は、コードを改変削除済み：
$filename = $_GET['filename'];
$image = $_GET['image'];
// Only proceed if we got valid input
if ($filename !== null) {
echo "$filename is not null.";
$image = base64_decode($image);
$slash1 = strpos($image, '/');
$image_type = substr($image, $slash1, strpos($image, ';') - $slash1);
if (file_exists($filename)) unlink($filename);
header('Content-Type: image/' . $image_type);
switch ($image_type) {
case "gif":
$successful = imagegif($image, "./$filename");
break;
case "jpeg":
case "jpg":
$successful = imagejpeg($image, "./$filename");
break;
case "png":
$successful = imagepng($image, "./$filename");
break;
}
if ($successful) {
echo "Image written to '$filename'.";
} else {
echo "Could not write $image_type image to '$filename'.";
}
imagedestroy($image);
echo "image destroyed.";
} else {
echo "$filename is null.";
}
でも、回答はCould not write image to 't.jpg'です。
EDIT 3：これは、私は2つのパラメータに渡すものです：
?filename=t.jpg&image=data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/4QAiRXhpZgAATU0AKgAAAAgAAQESAAMAAAABAAEAAAAAAAD/7AARRHVja3kAAQAEAAAAPAAA/+0ALFBob3Rvc2hvcCAzLjAAOEJJTQQlAAAAAAAQAAAAAAAAAAAAAAAAAAAAAP/bAEMAAgEBAgEBAgICAgICAgIDBQMDAwMDBgQEAwUHBgcHBwYHBwgJCwkICAoIBwcKDQoKCwwMDAwHCQ4PDQwOCwwMDP/bAEMBAgICAwMDBgMDBgwIBwgMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAwMDP/AABEIAAEAAQMBIgACEQEDEQH/xAAfAAABBQEBAQEBAQAAAAAAAAAAAQIDBAUGBwgJCgv/xAC1EAACAQMDAgQDBQUEBAAAAX0BAgMABBEFEiExQQYTUWEHInEUMoGRoQgjQrHBFVLR8CQzYnKCCQoWFxgZGiUmJygpKjQ1Njc4OTpDREVGR0hJSlNUVVZXWFlaY2RlZmdoaWpzdHV2d3h5eoOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4eLj5OXm5+jp6vHy8/T19vf4+fr/xAAfAQADAQEBAQEBAQEBAAAAAAAAAQIDBAUGBwgJCgv/xAC1EQACAQIEBAMEBwUEBAABAncAAQIDEQQFITEGEkFRB2FxEyIygQgUQpGhscEJIzNS8BVictEKFiQ04SXxFxgZGiYnKCkqNTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqCg4SFhoeIiYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2dri4+Tl5ufo6ery8/T19vf4+fr/2gAMAwEAAhEDEQA/APA6KKK/qA/Cz//Z
EDIT 4：は、@ delboy1978ukの提案に応じてコードを修正しました。
$filename = $_GET['filename'];
$image = $_GET['image'];
echo "file $filename = '$image'.";
// Only proceed if we got valid input
if ($filename !== null) {
$slash = strpos($image, '/') + 1;
$image_type = substr($image, $slash, strpos($image, ';') - $slash);
$comma = strpos($image, ',') + 1;
$image = substr($image, $comma);
$decoded_image = base64_decode($image);
$image = imagecreatefromstring($decoded_image);
echo "The image type is '$image_type'.";
if (file_exists($filename)) {
unlink($filename);
echo "Deleted file '$filename'.";
}
header('Content-Type: image/' . $image_type);
$filename .= '.' . $image_type;
switch ($image_type) {
case "gif":
$successful = imagegif($image, "./$filename");
break;
case "jpeg":
case "jpg":
$successful = imagejpeg($image, "./$filename");
break;
case "png":
$successful = imagepng($image, "./$filename");
break;
}
if ($successful) {
echo "Image written to '$filename'.";
} else {
echo "Could not write $image_type image to '$filename'.";
}
if (imagedestroy($image) === true) {
echo "Image destroyed.";
}
} else {
echo "$filename is null.";
}
が重複する可能性が。com/questions/4672392/create-image-from-data-url） – iainn