PHP直接将文件流转换为字符串

时间：2023-11-28 16:46:20

有时候不需要图片直接输出到浏览器，需要如下处理！

输出到浏览器

$qrCode = new QrCode();

$qrCode

    ->setText('Life is too short to be generating QR codes')

    ->setSize(300)

    ->setPadding(10)

    ->setErrorCorrection('high')

    ->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0])

    ->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0])

    ->setLabelFontSize(16)

    ->setImageType(QrCode::IMAGE_TYPE_PNG);

header('Content-Type: '.$qrCode->getContentType());

$qrCode->render();

转为字符串

$qrCode = new QrCode();

$qrCode

    ->setText('Life is too short to be generating QR codes')

    ->setSize(300)

    ->setPadding(10)

    ->setErrorCorrection('high')

    ->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0])

    ->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0])

    ->setLabelFontSize(16)

    ->setImageType(QrCode::IMAGE_TYPE_PNG);

// 开启缓冲区

ob_start ();

// 将图片写入内存

imagepng ($qrCode->render());

// 从内存中读取图片

$imageData = ob_get_contents();

// 关闭缓冲区

ob_end_clean ();

// 将内容写入cdn

$up_res = $this->upload_cdn($imageData);

dump($up_res);

或者再折腾成base64

$qrCode = new QrCode();

$qrCode

    ->setText('Life is too short to be generating QR codes')

    ->setSize(300)

    ->setPadding(10)

    ->setErrorCorrection('high')

    ->setForegroundColor(['r' => 0, 'g' => 0, 'b' => 0, 'a' => 0])

    ->setBackgroundColor(['r' => 255, 'g' => 255, 'b' => 255, 'a' => 0])

    ->setLabelFontSize(16)

    ->setImageType(QrCode::IMAGE_TYPE_PNG);

// 开启缓存

ob_start();

imagepng($qrCode->render());

// 从内存中读取图片

$imageData = ob_get_contents();

// 关闭缓冲区

ob_end_clean ();

$imageDataBase64 = 'data:image/png;base64,' . base64_encode ($imageData);

echo "<img src='$imageDataBase64'/>";

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