PHP可以使用$ c = $ a_ $ b [“$ z”]？

Question

I created a array_common.php to save my array. because these array always use.

function show_common($value,$type){
    $array_common =  substr(dirname(__FILE__),0,-10)."config/array_common.php";

    include "$array_common";    
    $show = $arr_.$type["$value"];
    return $show;

}

I include array_common.php so I got the these array value. array_common.php content

$arr_come_from=array(
    "1"=>"Google",
    "2"=>"facebook",
    "3"=>"yahoo",
    "4"=>"twitter",
    "99"=>"other"
);
$arr_gender=array(
    "1"=>"Male",
    "2"=>"Female"
);

I created this function and I hope use this to show array content

 show_common(2,come_from);  //echo facebook
 show_common(1,gender);  //echo Male 
 show_common(2,gender);  //echo Female 

but php Notice: Notice: Undefined variable: arr_ in.........

maybe this code problem?

$show = $arr_.$type["$value"];

any suggest?

Answer 1

Use {} Complex (curly) syntax to build the name of the variable you are trying to access:

$show = ${'arr_'.$type}["$value"];