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Opened 5 years ago

Closed 5 years ago

Last modified 5 years ago

#17129 closed enhancement (fixed)

Speed up is_serialized_string()

Reported by: markjaquith Owned by: markjaquith
Milestone: 3.2 Priority: normal
Severity: minor Version:
Component: Performance Keywords: reporter-feedback
Focuses: Cc:


is_serialized_string() uses an expensive regular expression. It should use substring peeking like is_serialized() does. In my tests, this offers a time reduction of about 26%.

Attachments (2)

17129.diff (699 bytes) - added by markjaquith 5 years ago.
17129.patch (756 bytes) - added by hakre 5 years ago.

Download all attachments as: .zip

Change History (9)

5 years ago

#1 @greuben
5 years ago

Edit: Oops, Ignore What I've said...

the last elseif can be changed to

elseif ( '"' !== $data[4] || '"' !== $data[$length-2] )
    return false;
Last edited 5 years ago by greuben (previous) (diff)

#2 @markjaquith
5 years ago

  • Owner set to markjaquith
  • Resolution set to fixed
  • Status changed from new to closed

In [17779]:

Speed optimizations for is_serialized_string(). fixes #17129

#3 @nacin
5 years ago

  • Milestone changed from Awaiting Review to 3.2

5 years ago


#4 @hakre
5 years ago

  • Keywords reporter-feedback added

When I reviewed the changeset this is what came into my mind. I have not benchmarked so far if it's actually faster than the if / else approach.

#5 @hakre
5 years ago

Related: #14429

#6 @hakre
5 years ago

A note of caution: is_serialized_string() will return true for cases is_serialized() will return false. So both functions are not compatible with each other.

Related: #17375

As is_serialized_string() is used in core only after if(is_serialized()) has been true, and it's not same stage compatible, it could be even written much smaller by just checking for s/S as the first letter.

Last edited 5 years ago by hakre (previous) (diff)

#7 @hakre
5 years ago

Related: #17445

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