#40482 [NEW]: Sprintf format specifier "e" output modification

[kore@php.net]

From: [email]kore@php.net[/email]
Operating system: Linux 2.6.20
PHP version: 5.2.1
PHP Bug Type: Output Control
Bug description: Sprintf format specifier "e" output modification

Description:
------------
There is no real category for sprintf() or string functions issues, I hope
the selected one fits the issue.

Between PHP 5.2.1 RC1 and PHP 5.2.1 the resulting output with the format
specifier "e" changed. All PHP version prior to 5.2.1 tested by me have
the same result as PHP 5.2.0.

Even the tests were changed to reflect this new behavior:
[url]http://cvs.php.net/viewvc.cgi/php-src/ext/standard/tests/strings/sprintf_f_2.phpt?r1=1.1.2.3&r2=1.1.2.4[/url]

Reproduce code:
---------------
$ php -r 'var_dump( sprintf( "%.3e", 0.0000234 ) );'

Expected result:
----------------
string(7) "2.34e-5"

Actual result:
--------------
string(8) "2.340e-5"

--
Edit bug report at [url]http://bugs.php.net/?id=40482&edit=1[/url]
--
Try a CVS snapshot (PHP 4.4): [url]http://bugs.php.net/fix.php?id=40482&r=trysnapshot44[/url]
Try a CVS snapshot (PHP 5.2): [url]http://bugs.php.net/fix.php?id=40482&r=trysnapshot52[/url]
Try a CVS snapshot (PHP 6.0): [url]http://bugs.php.net/fix.php?id=40482&r=trysnapshot60[/url]
Fixed in CVS: [url]http://bugs.php.net/fix.php?id=40482&r=fixedcvs[/url]
Fixed in release: [url]http://bugs.php.net/fix.php?id=40482&r=alreadyfixed[/url]
Need backtrace: [url]http://bugs.php.net/fix.php?id=40482&r=needtrace[/url]
Need Reproduce Script: [url]http://bugs.php.net/fix.php?id=40482&r=needscript[/url]
Try newer version: [url]http://bugs.php.net/fix.php?id=40482&r=oldversion[/url]
Not developer issue: [url]http://bugs.php.net/fix.php?id=40482&r=support[/url]
Expected behavior: [url]http://bugs.php.net/fix.php?id=40482&r=notwrong[/url]
Not enough info: [url]http://bugs.php.net/fix.php?id=40482&r=notenoughinfo[/url]
Submitted twice: [url]http://bugs.php.net/fix.php?id=40482&r=submittedtwice[/url]
register_globals: [url]http://bugs.php.net/fix.php?id=40482&r=globals[/url]
PHP 3 support discontinued: [url]http://bugs.php.net/fix.php?id=40482&r=php3[/url]
Daylight Savings: [url]http://bugs.php.net/fix.php?id=40482&r=dst[/url]
IIS Stability: [url]http://bugs.php.net/fix.php?id=40482&r=isapi[/url]
Install GNU Sed: [url]http://bugs.php.net/fix.php?id=40482&r=gnused[/url]
Floating point limitations: [url]http://bugs.php.net/fix.php?id=40482&r=float[/url]
No Zend Extensions: [url]http://bugs.php.net/fix.php?id=40482&r=nozend[/url]
MySQL Configuration Error: [url]http://bugs.php.net/fix.php?id=40482&r=mysqlcfg[/url]

[tony2001@php.net]

ID: 40482
Updated by: [email]tony2001@php.net[/email]
Reported By: [email]kore@php.net[/email]
-Status: Open
+Status: Bogus
Bug Type: Output Control
Operating System: Linux 2.6.20
PHP Version: 5.2.1
New Comment:

That was actually a bugfix.
sprintf( "%.3e", 0.0000234 );
^^^^ it's "3 digits after the floating point"

string(8) "2.340e-5"
^^^ 3 digits, not 2.


Previous Comments:
------------------------------------------------------------------------

[2007-02-14 12:44:18] [email]kore@php.net[/email]

Description:
------------
There is no real category for sprintf() or string functions issues, I
hope the selected one fits the issue.

Between PHP 5.2.1 RC1 and PHP 5.2.1 the resulting output with the
format specifier "e" changed. All PHP version prior to 5.2.1 tested by
me have the same result as PHP 5.2.0.

Even the tests were changed to reflect this new behavior:
[url]http://cvs.php.net/viewvc.cgi/php-src/ext/standard/tests/strings/sprintf_f_2.phpt?r1=1.1.2.3&r2=1.1.2.4[/url]

Reproduce code:
---------------
$ php -r 'var_dump( sprintf( "%.3e", 0.0000234 ) );'

Expected result:
----------------
string(7) "2.34e-5"

Actual result:
--------------
string(8) "2.340e-5"


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40482&edit=1[/url]

[kore@php.net]

ID: 40482
User updated by: [email]kore@php.net[/email]
Reported By: [email]kore@php.net[/email]
-Status: Bogus
+Status: Open
Bug Type: Output Control
Operating System: Linux 2.6.20
PHP Version: 5.2.1
New Comment:

You could see the the number as the precision of the output number. You
normally won't ever get more then one digit in front of the decimal
point with scientific notation. Even PHP 5.2.1 acts like this:

# php -r 'var_dump( sprintf( "%2.3e", 5555555555 ) );'
string(8) "5.556e+9"

If you still do not want to change the behavior back to the old one,
the new behavior should be documented:

[url]http://de3.php.net/manual/en/function.sprintf.php[/url] Example #2308 still
shows the old behavior. In this case feel free to change the bugs
category to a documentation bug.


Previous Comments:
------------------------------------------------------------------------

[2007-02-14 12:49:04] [email]tony2001@php.net[/email]

That was actually a bugfix.
sprintf( "%.3e", 0.0000234 );
^^^^ it's "3 digits after the floating point"

string(8) "2.340e-5"
^^^ 3 digits, not 2.

------------------------------------------------------------------------

[2007-02-14 12:44:18] [email]kore@php.net[/email]

Description:
------------
There is no real category for sprintf() or string functions issues, I
hope the selected one fits the issue.

Between PHP 5.2.1 RC1 and PHP 5.2.1 the resulting output with the
format specifier "e" changed. All PHP version prior to 5.2.1 tested by
me have the same result as PHP 5.2.0.

Even the tests were changed to reflect this new behavior:
[url]http://cvs.php.net/viewvc.cgi/php-src/ext/standard/tests/strings/sprintf_f_2.phpt?r1=1.1.2.3&r2=1.1.2.4[/url]

Reproduce code:
---------------
$ php -r 'var_dump( sprintf( "%.3e", 0.0000234 ) );'

Expected result:
----------------
string(7) "2.34e-5"

Actual result:
--------------
string(8) "2.340e-5"


------------------------------------------------------------------------


--
Edit this bug report at [url]http://bugs.php.net/?id=40482&edit=1[/url]