Bug #63825 [Opn->Csd]: php dose not follow the operator precedence
Edit report at https://bugs.php.net/bug.php?id=63825&edit=1
ID: 63825
User updated by:rssidea at qq dot com
Reported by:rssidea at qq dot com
Summary:php dose not follow the operator precedence
-Status: Open
+Status: Closed
Type: Bug
Package:*Compile Issues
Operating System: all
PHP Version:5.3.20
Block user comment: N
Private report: N
New Comment:
I find a note in documentation:Although = has a lower precedence than most
other
operators, PHP will still allow expressions similar to the following: if (!$a =
foo()), in which case the return value of foo() is put into $a.
so, this is not a bug, but it may be a snare :)
Previous Comments:
[2012-12-21 06:10:55] rssidea at qq dot com
Description:
By Operator Precedence on
http://php.net/manual/en/language.operators.precedence.php, logical operator
'||'
is higher than assignment operator '=', so the script below should cause a
syntax
error.
Test script:
---
$a = $b = 0;
if ($a = 1 || $b = 1) {
echo $a;
}
Expected result:
execute as:
if ($a = (1 || $b) = 1) {
output:
syntax error, unexpected '='
Actual result:
--
execute as:
if ($a = (1 || ($b = 1))) {
output:
1
--
Edit this bug report at https://bugs.php.net/bug.php?id=63825&edit=1
[PHP-BUG] Bug #63825 [NEW]: php dose not follow the operator precedence
From: rssidea at qq dot com
Operating system: all
PHP version: 5.3.20
Package: *Compile Issues
Bug Type: Bug
Bug description:php dose not follow the operator precedence
Description:
By Operator Precedence on
http://php.net/manual/en/language.operators.precedence.php, logical
operator '||'
is higher than assignment operator '=', so the script below should cause a
syntax
error.
Test script:
---
$a = $b = 0;
if ($a = 1 || $b = 1) {
echo $a;
}
Expected result:
execute as:
if ($a = (1 || $b) = 1) {
output:
syntax error, unexpected '='
Actual result:
--
execute as:
if ($a = (1 || ($b = 1))) {
output:
1
--
Edit bug report at https://bugs.php.net/bug.php?id=63825&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=63825&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=63825&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=63825&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=63825&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=63825&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=63825&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=63825&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=63825&r=oldversion
Not developer issue:https://bugs.php.net/fix.php?id=63825&r=support
Expected behavior: https://bugs.php.net/fix.php?id=63825&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=63825&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=63825&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=63825&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=63825&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=63825&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=63825&r=isapi
Install GNU Sed:https://bugs.php.net/fix.php?id=63825&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=63825&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=63825&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=63825&r=mysqlcfg
