Bug #11466 Updated: it works ambiguously to unset the global variable in function
| From: | vanity at neowiz dot com | Date: | Wed, 13 Jun 2001 19:00:40 +0000 |
| Subject: | Bug #11466 Updated: it works ambiguously to unset the global variable in function | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-57086@lists.php.net to get a copy of this message | ||
ID: 11466
User Update by: vanity@neowiz.com
Status: Bogus
Bug Type: Variables related
Operating system: FreeBSD 3.5.1
PHP Version: 4.0.4pl1
Description: it works ambiguously to unset the global variable in function
I think that it's a bug even if this is how it works. :(
'Cause unset can does or doesn't work like this.
function unset_test ()
{
global $var;
global $arr;
unset($var); // unset works
unset($arr["something"]); // unset doesn't works
}
Previous Comments:
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[2001-06-13 13:32:23] sniper@php.net
Yes, this is how it works, not a bug.
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[2001-06-13 11:14:10] vanity@neowiz.com
These two sources are the same except the last line of the second one.
The former represents that it doesn't work to unset the global variable,
the latter that it only works when unset throught the $GLOBALS variable.
[SRC 1: unset doesn't work]
============================================================
<?php
function unset_variable ($name, $flag)
{
global $$name;
global $GLOBALS;
if ($flag & 1)
{
echo " - <font color=magenta>unset $$name</font><br>n";
unset($$name);
}
if ($flag & 2)
{
echo " - <font color=magenta>unset
$GLOBALS["$name"]</font><br>n";
unset($GLOBALS[$name]);
}
}
function disp_variable ($name)
{
global $$name;
global $GLOBALS;
printf(" - $%s : %s<BR>n",
$name, isset($$name) ? "<font color=green>".$$name."</font>"
: "<font color=red>(unset)</font>");
printf(" - $GLOBALS[%s] : %s<BR>n",
$name, isset($GLOBALS[$name]) ? "<font
color=green>".$GLOBALS[$name]."</font>" : "<font
color=red>(unset)</font>");
}
for ($i=0; $i < 4; $i++)
{
$name = "var$i";
$$name = "VALUE_$i";
$step = $i;
$flag = $i;
printf("<font color=blue>STEP (%s)</font><BR>n", $step);
disp_variable ($name);
unset_variable ($name, $flag);
disp_variable ($name);
printf("<BR>n");
}
?>
============================================================
[SRC 2: unset works only throught the $GLOBALS variable]
============================================================
<?php
function unset_variable ($name, $flag)
{
global $$name;
global $GLOBALS;
if ($flag & 1)
{
echo " - <font color=magenta>unset $$name</font><br>n";
unset($$name);
}
if ($flag & 2)
{
echo " - <font color=magenta>unset
$GLOBALS["$name"]</font><br>n";
unset($GLOBALS[$name]);
}
}
function disp_variable ($name)
{
global $$name;
global $GLOBALS;
printf(" - $%s : %s<BR>n",
$name, isset($$name) ? "<font color=green>".$$name."</font>"
: "<font color=red>(unset)</font>");
printf(" - $GLOBALS[%s] : %s<BR>n",
$name, isset($GLOBALS[$name]) ? "<font
color=green>".$GLOBALS[$name]."</font>" : "<font
color=red>(unset)</font>");
}
for ($i=0; $i < 4; $i++)
{
$name = "var$i";
$$name = "VALUE_$i";
$step = $i;
$flag = $i;
printf("<font color=blue>STEP (%s)</font><BR>n", $step);
disp_variable ($name);
unset_variable ($name, $flag);
disp_variable ($name);
printf("<BR>n");
}
$GLOBALS[anything];
?>
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Full Bug description available at: http://bugs.php.net/?id=11466