[PHP-DEV] Bug #11466: it works ambiguously to unset the global variable in function

[vanity]

From:             [EMAIL PROTECTED]
Operating system: FreeBSD 3.5.1
PHP version:      4.0.4pl1
PHP Bug Type:     Variables related
Bug description:  it works ambiguously to unset the global variable in function

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];
?>
============================================================



-- 
Edit Bug report at: http://bugs.php.net/?id=11466&edit=1



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