请问一个异常Warning: rawurlencode() expects parameter 1 to be string, array given

请教一个错误Warning: rawurlencode() expects parameter 1 to be string, array given
Warning: rawurlencode() expects parameter 1 to be string, array given

PHP code

$normalized = array();    foreach($params as $key => $val)    {        $normalized[] = $key."=".rawurlencode($val);    }

参数$params为
array
  'auto' => int 123
  'on' => string '256855' (length=13)
  'ei' => string '' (length=0)
  'tm' => string '59.00' (length=5)
  'name' => string '' (length=0)
  'add' => string '' (length=0)
  'state' => int 1
  'list' => 
  array
  1 => string 'xxxxddewweew拾掇拾掇/59.00/1@' (length=68)

[解决办法]
rawurlencode() expects parameter 1 to be string, array given
rawurlencode() 需要一个字符串类型的参数，你却传递了一个数组

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