从base64中获取图像字符串

Question

我正在尝试使用base64编码的字符串并将它作为图像在PHP中使用$_POST返回。如果我使用$_POST['imgdata']，那么在线上它会从preg_match返回错误，如果我使用base64字符串进行硬编码而不是使用$_POST，则它将工作并返回图像。我怎样才能使这项工作通过$_POST

作品

$imgstr = 'data:image/png;base64,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'; 

不起作用

$imgstr = $_POST['imgdata']; 

全码

$imgstr = $_POST['imgdata']; 
// Grab the MIME type and the data with a regex for convenience 
if (!preg_match('/data:([^;]*);base64,(.*)/', $imgstr, $matches)) { 
    die("error"); 
} 

// Decode the data 
$content = base64_decode($matches[2]); 

// Output the correct HTTP headers (may add more if you require them) 
header('Content-Type: '.$matches[1]); 
header('Content-Length: '.strlen($content)); 

// Output the actual image data 
echo $content; 

Answer 1

不知道为什么正则表达式是不工作为你，我复制了base64的发布数据和你的代码，它工作得很好。你可以尝试这个，而不使用正则表达式，可能会更快一点，并使用更少的内存。

$imgstr = $_GET['imgdata']; 

list($type, $imgstr) = explode(';', $imgstr); 
list(, $type)  = explode(':', $type); 
list(, $imgstr)  = explode(',', $imgstr); 
$content = base64_decode($imgstr); 

Answer 2

如前所述，不应该错过“+”，其余的都是直截了当的。如果您不确定是否发布或获取，请使用$ _REQUEST。

// requires php5 
define('UPLOAD_DIR', 'images/'); 
$img = $_REQUEST['img']; 
$img = str_replace('data:image/png;base64,', '', $img); 
$img = str_replace(' ', '+', $img); 
$data = base64_decode($img); 
$file = UPLOAD_DIR . uniqid() . '.png'; 
$success = file_put_contents($file, $data); 
print $success ? $file : 'Unable to save the file.'; 

Answer 3

<?php 
$data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl' 
     . 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr' 
     . 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r' 
     . '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg=='; 
$data = base64_decode($data); 

$im = imagecreatefromstring($data); 
if ($im !== false) { 
    header('Content-Type: image/png'); 
    imagepng($im); 
    imagedestroy($im); 
} 
else { 
    echo 'An error occurred.'; 
} 
?> 

源：文档。

检出imagecreatefromstring。

Answer 4

这是一个，我想你会喜欢以下，

<?php 
$imgstr = 'image/png;base64,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'; 
$new_data=explode(";",$imgstr); 
$type=$new_data[0]; 
$data=explode(",",$new_data[1]); 
header("Content-type:".$type); 
echo base64_decode($data[1]); 
?> 

上面的代码将产生输出按你的愿望，尝试this..This可以帮助你。

对不起，延迟回复，现在只有我恢复我的StackOverFlow帐户很长一段时间后。

注意：忽略PHP文件上用于图像解码的开始''标记之前的空白空间。如果该文件上有空文件意味着它会抛出错误消息并且不会创建或显示解码后的原始图像。

Answer 5

请检查下面的代码，它正在为我好，

$data = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA1IAAAE7CAYAAADXQrC8AAANvUlEQVR4nO3dLXoqWRuGUebDGBgBA0BjsZFxuDhcVFQMKiYmBoPBIDCImAgEAoGoCexPpM9PkirgSYo06W+JZbr7UPu8u0XdV8GuTlVVBQAAgNN1/u0FAAAA/DRCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQAAABCQgoAACAkpAAAAEJCCgAAICSkAAAAQkIKAAAgJKQA/g/st5uyWi7K09NjeXx8LE9Ps7JYPZfd/v9rDf8F5ghwGYQUQJPdsoyHwzIajXLDYbm6nZV9w2cMB8MyXW7fXG+3mpbh4P1/OyzD62nZVlWpql15GI/K8P1nDUflbv5S+3fYrJ7KeNgrnU6nQbeMbqblZXfqXC5hDZ/Yp+GwXN8vv3//D8zs0J8dTz+uNZ5ja+sHoI6QAmiwXUwO3LSeoHdTNtt56Tf8+5v55rTr9SZlU1WlqrZl0qv/rN549m79+zKbDE9ea/fDn29yCWt4a3fqPvUm/wTpN+7/kZk16d3MvzzH9tYPQB0hBdDgyzei/UnZ7uZl0EJIvQbAttz26z+r/+bGuyrzySBa6/Xj84lzuYQ1vLWejk68xqgsg6+/tbL/R2bW5O9ZfnaO7a0fgDpCCqDByU86Gg3LYvP9IbVb3sVrfb+WZpewhrdm4/6J1+iVx5dv3v/d4ZkdC6mvzLG99QNQR0gBNFiETwI+6pfZy3eH1LbcDdJ19srD8/7EuVzCGt6uZxJEShJrrez/9vDMmrx+te9rc2xv/QDUEVIADTbzuw+HPwwHzT/27w/fHhIxGI7L8rufSG2eSu/IDXJ/MCyDfveTN8yXsIa/7JdlWHeNbrf2uoPbxffu/5EnUr1+zUEkw8HrwRhfnGN76wegjpACCOyXtw03ooOyqPv9zTf/Rurg72J612X+vPt9vc3y4XVt3euyPnkGl7CGv7w81sbGcPJQbocf/3n36uFLJ9HF+39kZpPFrvFa55jj59YPQB0hBRBovrlteKLyzSG1nl413nzfrz+ub7eclE5nHJzOdglr+Gtm85uGQFmV+7qvxX3xJLp4/4/M7NBXDc8xx8+tH4A6QgogcOhGdH4BITWfNBy80L0uz7V/p31Zr9bBU5pLWMMfy9v63wFNltuyqv13gzL/wtfV4v0/MrNDIXWOOX5u/QDUEVIAgTZDarJ490Lec4bU73dRfdUlrOGXfXkY1f0Wql/m+6ohpLrlftX8dbrW9//IzG7m28ZrnWOOQgqgPUIKINBmSF1P5+V5vS6r1aqs189lMb3+ckitH5q+DtYt0/VnTsV77xLW8Mum3NS+6LZf5ruq7Bv2avz08n37f2Rm46fnUu13Zbd7a3+mOQopgPYIKYBAmyF1siCkdo2HCXRKp9Mrt7P1F2dwCWv4M9v+gSc2Tet4/+Lgs+7/kZk1uZlvzjJHIQXQHiEFELj0kGo8DvzN5w3L7cO8bD51StslrOHVbtXwstpfX31rmv3gruy+a/+PzOxQSJ1jjkIKoD1CCiBw8SFVNR/A8FG3XN/Nwqi4hDW8enkaHw26Ud01P3vU+mf2/8jMDobUGeYopADaI6QAAj8hpKpqW6ZXzS9e/fj547I6+SS7S1jDq0XDYQx/1tG01s8f9f3dIdX2HIUUQHuEFEDgZ4TUq/XTXRnWHsZQ4+Svu13CGl7XcVf3nqhOp0x+n4TXdKrfxxMTz7b/R2ZWr1um67cnC7Y1RyEF0B4hBRC49PdI1XlZzcrk6vhXxMazU06zu4Q1VKWq1uWqW/8ZvcmsPK9XZb1el4fr+qdWo/vV9+z/kZmNH9dlt92WzWbzx7b5RL6vzlFIAbRHSAEEfmJI/bJ/WZRxw1OcTqdTulePJ8zgEtZQlWo7qz+x70S98ex79v/IzA69R+occxRSAO0RUgCBnxxSr9blqikwfl/nkEtYw4GXF5/qxOt8ef+PzOz9/wOZfI5CCqA9Qgog8DNCalcWT/PGUHh5bHjxb2dQ5kcPfLiENVRldT/6Wkh1hmURHm7xqf0/MrPjIdXuHIUUQHuEFEDgZ4TUttx0OmVwu6j9OzQ/zRmccDN9CWuoytM4OMmuVq88PDf/Fqm1/T8ys8lid+Sa7c5RSAG0R0gBBH5KSP367wbjaXl+92Ti4ar+JLt2v9p33jVMwuPET5n/Wfb/yMx6w6tyfX39xtXVqNw8rM4yRyEF0B4hBRD4aSH1qltG40m5n96X8aj+FLtOp1M6/duzhFTra9gtmmf6z2l1+/2+7PdVqapNY3T1J/VPeVrd/yMza9JrfBfW1+YopADaI6QAAj8ipD757qrhSUeC//tr2D8/lO6JM62qqsxv6oOjO5qW/bn3/8jMmvyeZctzFFIA7RFSAIH/bkid9tukS1jDdn7T8Od75fHl4++eFpOGJze9m/Jy7v0/MrPzhFTzHIUUQHuEFEDg0I3orO5GdDtvfN9RElKbqiqHfhv0PmLSdyxNTv690L+/hsWk6YW09TGwaQyvhj1rc/+PzKxJ76+QanOOn1s/AHWEFECg+Ua04Tjt3bKMGm5475a70z578Ov3LrtyP6w/XKA/efsOp+3zvNyOR6V37IZ9cF1m62Mnx/3t31/DvDGkRmW5T/asX542Z97/f2Y2HTUcCtHgaro+yxw/t34A6ggpgP+0fdk8r8ti9lQeHx7KdDotD49PZbZYlpdtfvz3z13Df4E5AlwSIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQElIAAAAhIQUAABASUgAAACEhBQAAEBJSAAAAISEFAAAQ+h9OaCdW3kXmdwAAAABJRU5ErkJggg=='; 
$data = str_replace('data:image/png;base64,', '', $data); 
$data = str_replace(' ', '+', $data); 
$data = base64_decode($data); // Decode image using base64_decode 
$file = uniqid() . '.png'; //Now you can put this image data to your desired file using file_put_contents function like below: 
$success = file_put_contents($file, $data); 

Answer 6

您可以通过这个表达式捕捉部分：

^数据：（[A-ZA-Z] +/[A- ZA-Z] +）; BASE64 \，（[A-ZA-Z0-9 + \ = /] +）$

Answer 7

$imgstr = 'data:image/png;base64,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'; 
preg_match("/data\:image\/(.*)\;base64/",$imgstr, $match); 
echo $match[1]; 

^^^^返回文件扩展名。

$data = str_replace('data:image/png;base64,', '', $imgstr); 
data = str_replace(' ', '+', $data); 
$data = base64_decode($data); 
file_put_contents("/files/youfilemane.".$match[1],$data); 

^^^^从base64创建文件。