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    fopen('test.jpg');
}
$fp = fopen('test.jpg', 'w');
fwrite($fp, $byte); //$byte ΪͼƬ×Ö½Ú
fclose($fp);

header ("Content-type: image/jpg");
echo $byte;  //¿´¿´Õâ×Ö½ÚÊDz»ÊÇͼƬ


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