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Doc Bug #50372 Ternary statements are not identical
Submitted: 2009-12-03 12:13 UTC Modified: 2009-12-04 09:19 UTC
From: jakeophobia at gmail dot com Assigned: rquadling (profile)
Status: Closed Package: Documentation problem
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
View Developer Edit
 [2009-12-03 12:13 UTC] jakeophobia at gmail dot com 
Description:
------------
On page: http://www.php.net/manual/en/language.operators.comparison.php

In 'Example #3 Non-obvious Ternary Behaviour'

The two statements are not 'identical'.

The second ternary statment has parenthesis on 'false'


Expected result:
----------------
...

echo (true?'true':false?'t':'f');

...the following is a more obvious version of the same code as above...

echo ((true ? 'true' : false) ? 't' : 'f');

...


Actual result:
--------------
...

echo (true?'true':false?'t':'f');

...the following is a more obvious version of the same code as above...

echo ((true ? 'true' : 'false') ? 't' : 'f');

...

Patches

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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2009-12-03 12:52 UTC] rquadling@php.net 
The () in the second version are redundant and are only there to 
emphasize the left-to-right expression evaluation. The output of both 
versions is the same, 't'.
 [2009-12-03 21:25 UTC] jakeophobia at gmail dot com 
Oops, I meant single quotes. Take a look at false vs. 'false'
 [2009-12-04 09:18 UTC] rquadling@php.net 
Aha! I see.

Actually, false / 'false' could be anything.

echo (true?'true':99?'t':'f');
echo (true?'true':foo?'t':'f');
echo (true?'true':null?'t':'f');
echo (true?'true':false?'t':'f');
echo (true?'true':'false'?'t':'f');

all output 't' as the result do to the left-to-right evaluation.
 [2009-12-04 09:19 UTC] svn@php.net 
Automatic comment from SVN on behalf of rquadling
Revision: http://svn.php.net/viewvc/?view=revision&revision=291695
Log: Make examples consistent. Fix #50372
 [2009-12-04 09:19 UTC] rquadling@php.net 
This bug has been fixed in the documentation's XML sources. Since the
online and downloadable versions of the documentation need some time
to get updated, we would like to ask you to be a bit patient.

Thank you for the report, and for helping us make our documentation better.
 [2020-02-07 06:09 UTC] phpdocbot@php.net 
Automatic comment on behalf of rquadling
Revision: http://git.php.net/?p=doc/en.git;a=commit;h=1fc5ea1e2828fd8a2cc55442fc49862466b2609d
Log: Make examples consistent. Fix #50372
 
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