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See the PHP site.

 

There are quite a lot of security improvements:

  • When you download a resource via HTTPS using file_get_contents(), PHP now actually checks the certificate. Before, certificate validation was turned off by default, which is of course a joke and left a lot of applications wide open to man-in-the-middle attacks.
  • The Mcrypt extension no longer accepts incorrect keys or missing initialization vectors.
  • The function hash_equals() allows you to compare secret strings without leaking their content through time differences.
  • 1 year later...
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