#11466 [Com]: it works ambiguously to unset the global variable in function

[preference-password163 at hotmail dot com]

 ID:               11466
 Comment by:       preference-password163 at hotmail dot com
 Reported By:      vanity at neowiz dot com
 Status:           Bogus
 Bug Type:         Variables related
 Operating System: FreeBSD 3.5.1
 PHP Version:      4.0.4pl1
 New Comment:

<a href=http://rerotic-feetanalsex.da.ru>preference password</a>


Previous Comments:
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[2001-06-13 15:06:09] vanity at neowiz dot com

oops, sorry.

  unset($var);               // unset doesn't works
  unset($arr["something"]);  // unset works


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[2001-06-13 15:00:39] vanity at neowiz dot com

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
}


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[2001-06-13 13:32:23] [EMAIL PROTECTED]

Yes, this is how it works, not a bug.



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

[2001-06-13 11:14:10] vanity at neowiz dot 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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Edit this bug report at http://bugs.php.net/?id=11466&edit=1