I have an multiple variable like this and i want to combine two variable in foreach loop:
$foo = array(4, 9, 2);
$variables_4 = array("c");
$variables_9 = array("b");
$variables_2 = array("a");
foreach($foo as $a=>$b) {
foreach($variables_{$b} as $k=>$v) {
echo $v;
}
}
After i run above code it display error "Message: Undefined variable: variables_"
Is anyone know how to solve this problem?
You can use Variable variables to get the job done, but in this case it is kind of ugly.
A cleaner way to do this is by using nested arrays:
$foo = array(4=>array("c"),
9=>array("b"),
2=>array("a"));
foreach($foo as $a=>$b) {
foreach($b as $k=>$v) {
echo $v;
}
}
Then you won't have to create a lot of variables like $variables_9.
You should try to use eval(), for example:
foreach(eval('$variable_'.$b) as $k=>$v)...
I would highly suggest another route (this is a poor structure). But anyways...
Try concatenating into a string and then use that
$var = 'variables_' . $b;
foreach($$var as $k=>$v) {
echo $v;
}
This is a syntax error. You need to concatenate the strings within the brackets:
${'variables'.$b}
look at this post for more info.
