Doc #76875 [NEW]: It is not clear what 'uncomparable' means
From: manabu dot matsui at gmail dot com
Operating system:
PHP version: Irrelevant
Package: Documentation problem
Bug Type: Documentation Problem
Bug description:It is not clear what 'uncomparable' means
Description:
------------
---
From manual page: http://www.php.net/language.operators.comparison
---
In table 'Comparison with Various Types', it is said that 'if key from
operand 1 is not found in operand 2 then arrays are uncomparable', and
according to Example 2, the standard_array_compare function returns null
in that case.
When I actually tried it, each operator returned the following value.
<?php
$x = ['a' => 1];
$y = ['b' => 2];
var_dump($x < $y); # false
var_dump($x <= $y); # false
var_dump($x > $y); # false
var_dump($x >= $y); # false
var_dump($x <=> $y); # 1
?>
I can not explain this result from the manual description. I think it
would be better to explain more clearly.
What is the meaning of 'uncomparable'? For example, the following can be
considered
* If $x and $y are uncomparable, $x < $y, $x <= $y, $x > $y, $x >=$y are
all false, and $x <=> $y is 1.
* It returns some kind of value, but it is indeterminate what the value
is. (The above example happened to be so, in different situations it
could be different results)
--
Edit bug report at https://bugs.php.net/bug.php?id=76875&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76875&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76875&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76875&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=76875&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=76875&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=76875&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=76875&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=76875&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=76875&r=support
Expected behavior: https://bugs.php.net/fix.php?id=76875&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=76875&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=76875&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=76875&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76875&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=76875&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=76875&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=76875&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=76875&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=76875&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=76875&r=mysqlcfg
Thread (4 messages)
- manabu dot matsui at gmail dot com