note 105851 modified in language.variables.scope by danbrown
| From: | danbrown@php.net | Date: | Tue, 20 Sep 2011 11:25:30 +0000 |
| Subject: | note 105851 modified in language.variables.scope by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-183293@lists.php.net to get a copy of this message | ||
Functions are always global. I've had fun and games in the past with the global keyword with
nested functions. So for teleporting variables between functions I've occasionally adopted this
simple method.
<?php
function &teleport($vars = null){
static $toSave = array();
if($vars){
foreach($vars as $k=>&$v)
$toSave[$k] = $v;
}
return($toSave);
}
function myFuncA(){
extract(teleport(),EXTR_REFS);
$a = array('a'=>1,'b'=>2);
$b = "An arbitrary value of no consequence\n";
teleport(array('a'=>$a,'b'=>$b));
}
function myFuncB(){
extract(teleport(),EXTR_REFS);
$b = "Now this is of Consequence\n";
$c = "Another of Consequence\n";
teleport(array('c'=>$c));
}
function myFuncC(){
extract(teleport(),EXTR_REFS);
// $a,$b,$c are now in current scope
print_r(get_defined_vars());
print_r($a);
echo($b);
echo($c);
}
myFuncA();
myFuncB();
myFuncC();
?>
Purists might shout something about "USE A CLASS" etc...
Maybe but sometimes you might not want to or need to.
--was--
Functions are always global. I've had fun and games in the past with the global keyword with
nested functions. So for teleporting variables between functions I've occasionally adopted this
simple method.
<?
function &teleport($vars = null){
static $toSave = array();
if($vars){
foreach($vars as $k=>&$v)
$toSave[$k] = $v;
}
return($toSave);
}
function myFuncA(){
extract(teleport(),EXTR_REFS);
$a = array('a'=>1,'b'=>2);
$b = "An arbitrary value of no consequence\n";
teleport(array('a'=>$a,'b'=>$b));
}
function myFuncB(){
extract(teleport(),EXTR_REFS);
$b = "Now this is of Consequence\n";
$c = "Another of Consequence\n";
teleport(array('c'=>$c));
}
function myFuncC(){
extract(teleport(),EXTR_REFS);
// $a,$b,$c are now in current scope
print_r(get_defined_vars());
print_r($a);
echo($b);
echo($c);
}
myFuncA();
myFuncB();
myFuncC();
?>
Purists might shout something about "USE A CLASS" etc...
Maybe but sometimes you might not want to or need to.
http://php.net/manual/en/language.variables.scope.php