从 JFIF 数据创建文件


Create file from JFIF data

我有一个LDAP数据库的转储,我正在尝试使用PHP从中提取所有图像。这些图像似乎以JFIF格式存储(至少根据 https://www.rfc-editor.org/rfc/rfc2798#page-5)。但是,我不知道如何从中创建 JPEG 文件;我试图file_put_contents 以 name.jpeg、imagecreatefromstring 的输出转储所有内容imagejpeg以及这些输出的一些变体。但是,要么我没有正确使用它们,要么我只是尝试了这个错误。

所以问题来了:

以下是该领域的一小部分:

jpegPhoto:: /9j/4AAQSkZJRgABAQAAAQABAAD//gA+Q1JFQVRPUjogZ2QtanBlZyB2Mi4wICh1c2lu
 ZyBJSkcgSlBFRyB2NjIpLCBkZWZhdWx0IHF1YWxpdHkK/9sAQwAIBgYHBgUIBwcHCQkICgwUDQwLCww
 ZEhMPFB0aHx4dGhwcICQuJyAiLCMcHCg3KSwwMTQ0NB8nOT04MjwuMzQy/9sAQwEJCQkMCwwYDQ0YMi
 EcITIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIy/8AAEQgAh
 QBkAwEiAAIRAQMRAf/EAB8AAAEFAQEBAQEBAAAAAAAAAAABAgMEBQYHCAkKC//EALUQAAIBAwMCBAMF
 BQQEAAABfQECAwAEEQUSITFBBhNRYQcicRQygZGhCCNCscEVUtHwJDNicoIJChYXGBkaJSYnKCkqNDU
 2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6g4SFhoeIiYqSk5SVlpeYmZqio6Slpq
 eoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2drh4uPk5ebn6Onq8fLz9PX29/j5+v/EAB8BAAMBA
 QEBAQEBAQEAAAAAAAABAgMEBQYHCAkKC//EALURAAIBAgQEAwQHBQQEAAECdwABAgMRBAUhMQYSQVEH
 YXETIjKBCBRCkaGxwQkjM1LwFWJy0QoWJDThJfEXGBkaJicoKSo1Njc4OTpDREVGR0hJSlNUVVZXWFl
 aY2RlZmdoaWpzdHV2d3h5eoKDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8
 jJytLT1NXW19jZ2uLj5OXm5+jp6vLz9PX29/j5+v/aAAwDAQACEQMRAD8A8Kihad+OB3JrQhtI7aHzG
 bdKTwMdBVKSGWFVc7lDZAPTOOv6H9aTzJlKMGO4gEH26VEk31Jaua8MkSpIHk3dSkWw854J/wDrUtzb
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 2JVDjnOM5zjGP6VoXVsUl+Rcbjk4qg8Xlz5429Qf6VtGSaNYu6G4U5U9fX3qOJC7bTzn0qY5HDYwe9M
 CxhnBYnP3QO9WO5s6aJmiZWUtDyN+/P4dfxrNu0PmH50ZckEgd+P8AGpYbkwxBInOxnVmU9Diku49jj
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 sGkPcZOCB1qLc8bE8rehqXkYOShLBRg4B6+/wBax7iLazyj8P8A9da4a5ub1BbW7yuQobaOCP8AP/1q
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 m5UAgAEgYz70UlzKJpdwHbH60VcdjWOxp6XbwQLGsvmi4c5UL2A5+b245/+tVmVxbhpd4jKrjaG3Yb2
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 +XXP4V12n3sE8C6jGIVkZR5xL7QTnGD2zzx9abR6KXNE8B1CzOnanNC8JTyzwrnkAgEdhngiq7yyAdw
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 FvcVht5C1vcGJ8ZUdqKhaV5jvkbc3rRWyTS1No7GjiYKMb2XuOo/T8D1rOl8yN2WQHd1DZ5q1He2+xV
 k3E4AIU7fy61UuYcnzI2JU8hT1FTC6epmTwXsqbt7Ej07fX9KlzJhZBuVsgqehB7YrORlTaSoYA8qel
 aJnjkhQlZELHK7W3ACiStshnTaP4nlN8ftigI6hXeLIYnsTnOfwr0fw1IpjZEkVo3fcnGHbBBPsPujO
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 dcdByIzzyDz9D07g+ET2syMV3qccZx1r37x/q1paeC9QsC3+l3U0KBCP4QxYEev+rbP1HqK8Mnbr/eP
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数据采用base64编码,先解码,然后保存到文件中。请参阅 http://www.php.net/manual/en/function.base64-decode.php