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1）如果??¡??å•ä¸æœ‰æ–‡ä»¶??¦ä¸Šä¼ ，??¡??å•ä¸formæ ‡ç¾å¿…??¡»??®¾ç½®enctype="multipart/form-data"æ¥ç¡®ä¿åŒ¿åä¸Šä¼ æ–‡ä»¶çš„MIMEç¼–ç 。??»˜??®??情况下，??¡??å•çš„ç¼–ç ??å¼æ˜¯ application/x-www-form-urlencoded，ä¸??ƒ½ç”??äºŽæ–‡ä»¶ä¸Šä¼ ï¼›
2）??¿›??¡Œsessionå??„ç†æ—¶ï¼Œå¦‚æžœå??†??¡??å•??®¾ç½®enctype="text/plain"，则??€š??¿‡$_POST,$_GET,$_REQUESTç‰æ˜¯æ— 法å–åˆ??ֵ的。??¿™ç‚¹ä¸€å®š??¦å??心ï¼ï¼ï¼
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enctype defines how the data should be formatted before sending. the two correct formats are application/x-www-form-urlencoded (which essentially sends things as key=valye&anotherkey=anothervalue, with http headers) and multipart/form-data (which splits each key up into a distinct section of data). text/plain means nothing should be done - its behaviour is essentially undefined between browsers, and was only ever used for automated email forms in the days before spam. use application/x-www-form-urlencoded for text forms (or leave this to use the default setting) and multipart/form-data for file attachment uploads
text/plain:
Content-Type: text/plain================================================================================foo=barbaz=The first line.The second line.
application/x-www-form-urlencoded:
Content-Type: application/x-www-form-urlencoded================================================================================foo=bar&baz=The+first+line.%0D%0AThe+second+line.%0D%0Amultipart/form-data:
Content-Type: multipart/form-data; boundary=---------------------------314911788813839================================================================================-----------------------------314911788813839Content-Disposition: form-data; name="foo"bar-----------------------------314911788813839Content-Disposition: form-data; name="baz"The first line.The second line.-----------------------------314911788813839--you can see how the first one is useful for passing values UNCHECKED directly into an email program (e.g. if your form uses a mailto: address, so it uses your visitor's email program to send) but is largely useless for programmatic access to fields. only the bottom 2 examples are valid for actual form-based form data
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