base64与图片输出屏幕

if ($base64) {
    ob_start();
    // 输出图像
    imagepng($this->_image);
    imagedestroy($this->_image);
    $image_data = ob_get_contents();
    ob_end_clean ();
    $image_data_base64 = "data:image/png;base64,". base64_encode ($image_data);
    $json = new Json();
    $json->S($image_data_base64);
} else {
    header('Cache-Control: private, max-age=0, no-store, no-cache, must-revalidate');
    header('Cache-Control: post-check=0, pre-check=0', false);
    header('Pragma: no-cache');
    header("content-type: image/png");
    // 输出图像
    imagepng($this->_image);
    imagedestroy($this->_image);
}

{
    "errno": 0,
    "errdesc": "操作成功",
    "timestamp": 1575036206,
    "data": "data:image/png;base64,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"
}

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转载自www.cnblogs.com/jiqing9006/p/11960619.html