我想将字符串（关联数组字符串）转换为关联数组？

Question

i want to store associative array into a variable a as a string, and then convert the variable into array.

$var='"electirc_bill"=>array(
                                   "type" => "number",
                                    "required"=>"yes"
                                  ),
      "electirc_bill_per"=>array(
                                   "type" => "number",
                                    "required"=>"yes"
                                 ),                   
              "gass_bill"=>array(     
                                   "type" => "number",
                                    "required"=>"yes"
                                  )
    )';

    var_dump($var);

Answer 1

Use serialize and unserialize.

Convert the array to string:

$string = serialize($array);

Convert it back to an array:

$array = unserialize($string);

Edit: Based on your comment you seem to already have the array stored as a string and want to be able to convert it to an array. For that I would use eval but be cautious when using it with any user input as it could lead to security vulnerabilities within your code.

I've made a small example using your code here: http://codepad.org/rPNXPBlW

$var = '$array_var = array("One" => array("1.1", "1.2"), "Two" => array("2.1", "‌​2.2"));';

eval($var);

echo $array_var['One'][0]; // Shows 1.1