PHP array stringify

function data_stringify($data) {
  switch (gettype($data)) {
    case 'string' : return '\''.addcslashes($data, "'\\").'\'';
    case 'boolean': return $data ? 'true' : 'false';
    case 'NULL'   : return 'null';
    case 'object' :
    case 'array'  :
      $expressions = [];
      foreach ($data as $c_key => $c_value) {
        $expressions[] = data_stringify($c_key).' => '.
                         data_stringify($c_value);
      }
      return gettype($data) === 'object' ?
        '(object)['.implode(', ', $expressions).']' :
                '['.implode(', ', $expressions).']';
    default: return (string)$data;
  }
}

var_dump( data_stringify(-1    ) === '-1'     );
var_dump( data_stringify(-1.1  ) === '-1.1'   );
var_dump( data_stringify(123e1 ) === '1230'   ); # exponential notation
var_dump( data_stringify(0x123 ) === '291'    ); # hexadecimal notation
var_dump( data_stringify(01234 ) === '668'    ); # octal notation
var_dump( data_stringify(0b101 ) === '5'      ); # binary notation
var_dump( data_stringify('?123') === "'?123'" );
var_dump( data_stringify('123?') === "'123?'" );
var_dump( data_stringify(true  ) === 'true'   );
var_dump( data_stringify(false ) === 'false'  );
var_dump( data_stringify(null  ) === 'null'   );

var_dump(
  data_stringify([
    100,
   '200',
   'item3' =>  300,
   'item4' => '400',
   'item5' => 'value500'
  ]) === "[".
   "0 => 100, ".
   "1 => '200', ".
   "'item3' => 300, ".
   "'item4' => '400', ".
   "'item5' => 'value500']"
);

var_dump(
  data_stringify((object)[
    'prop1' =>  100,
    'prop2' => '200',
    'prop3' => 'value300'
  ]) === "(object)[".
   "'prop1' => 100, ".
   "'prop2' => '200', ".
   "'prop3' => 'value300']"
);

var_dump(
  data_stringify([
    100,
   '200',
   'item3' => (object)['prop1' =>  1, 'prop2' => '2', 'prop3' => 'value3'],
   'item4' => '400',
   'item5' => 'value500'
  ]) === "[".
   "0 => 100, ".
   "1 => '200', ".
   "'item3' => (object)['prop1' => 1, 'prop2' => '2', 'prop3' => 'value3'], ".
   "'item4' => '400', ".
   "'item5' => 'value500']"
);

var_dump(
  data_stringify((object)[
    'prop1' =>  1,
    'prop2' => '2',
    'prop3' => [100, '200', 'item3' => '300', 'item4' => 'value400'],
    'prop4' => 'value4'
  ]) === "(object)[".
   "'prop1' => 1, ".
   "'prop2' => '2', ".
   "'prop3' => [0 => 100, 1 => '200', 'item3' => '300', 'item4' => 'value400'], ".
   "'prop4' => 'value4']"
);