PHP – validate a form before the file uploads -


i have html form file input, submitted ajax upload.php. php script performs number of tests detect invalid submissions, e.g., checking encrypted timestamp, , either return error or process uploaded file.

the question is: possible perform server-side tests , return error before server receives entire file? save time , bandwidth.

no, if have 1 form ascii data , binary (uploads), it's 1 request. uploads stored in temp directory of server till move them.

but, can 2 things:

  • check cientside , start upload if check ok
  • extract upload function rest of post. can example upload in 'background', check on server side, etc., separated rest of form , submit.

i prefer no. 2. it's performance , user experience (e.g. large files).


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