Edit report at https://bugs.php.net/bug.php?id=26411&edit=1
ID: 26411
Comment by: kjarli at gmail dot com
Reported by: php at bellytime dot com
Summary: while {} else {}
Status: Open
Type: Feature/Change Request
Package: Scripting Engine problem
Operating System: *
PHP Version: *
Block user comment: N
Private report: N
New Comment:
I don't really see a problem why not to implement this
<?php
while(!true) {
// do something
} else[if[...]] {
// nothing to do
}
//Could internally be translated to:
$looped = false;
while(!true) {
$looped = true;
// do something
}
if(!$looped) {
// nothing to do
}
?>
Previous Comments:
------------------------------------------------------------------------
[2012-08-23 17:09:14] bensor987 at neuf dot fr
I would like to go further in that way : "iterated". "iterated" would be parsed
if there has been at least 1 iteration in the loop.
<?php
...
// Usual Case
$array_raw = SomeClass::getAll( $dbconn );
$cnt_raw = count( $array_raw );
$arr_output = array();
for ( $i = 0; $i < $cnt_raw; $i++ ) {
$arr_output[] = $array_raw[$i]->id . ' - ' . $array_raw[$i]->label;
}
if ( $cnt_raw > 0 ){
echo some_function( $arr_output );
} else {
echo 'Nothing to display';
}
...
?>
<?php
...
// Shorter, faster, lighter
$array_raw = SomeClass::getAll( $dbconn );
$cnt_raw = count( $array_raw );
$arr_output = array();
for ( $i = 0; $i < $cnt_raw; $i++ ) {
$arr_output[] = $array_raw[$i]->id . ' - ' . $array_raw[$i]->label;
} iterated {
echo some_function( $arr_output );
} none {
echo 'Nothing to display';
}
...
?>
------------------------------------------------------------------------
[2012-08-22 17:36:01] bensor987 at neuf dot fr
I understand your opinion. You want to make the "else" keyword usable only when
"false" is encountered, like in "if...else". I didn't think about this.
In that case, let's use another keyword, because this syntax is an excellent
idea.
Why not this ?
<?php
while ($row = mysql_fetch_assoc($result)) {
print 'Here is a result';
...
} none {
print 'No results found';
}
?>
------------------------------------------------------------------------
[2012-08-22 17:05:05] [email protected]
It's not that simple. Loops are repeatedly evaluated conditions. It isn't clear
whether adding an else clause would only apply to the first evaluation or also
subsequent ones.
------------------------------------------------------------------------
[2012-08-22 16:46:52] bensor987 at neuf dot fr
"no such syntax in other languages"....what do you mean ? PHP doesn't have the
right innovate ?
I see plenty of cases I would use this syntax. The "else"s would be triggered
if there hasn't been any iteration in the loop. It means : less variables to
use (so less memory usage), less code lines, etc...
There are only advantages to this syntax (and it's pretty simple to understand,
no KISS violation here). It's not because it isn't done by other languages that
we shouldn't implement it.
------------------------------------------------------------------------
[2012-08-22 10:44:30] [email protected]
Python has an "else" for loops, but it means something completely different.
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
https://bugs.php.net/bug.php?id=26411
--
Edit this bug report at https://bugs.php.net/bug.php?id=26411&edit=1
