array(2) {
  [0] => array(3) {
    ["title"] => string(36) "免疫沉淀 IP）实验操作步骤"
    ["type"] => string(2) "IP"
    ["file"] => string(54) "/uploads/20260708/cc582957b3b9838b33a46894378fa482.pdf"
  }
  [1] => array(3) {
    ["title"] => string(19) "（WB) 实验步骤"
    ["type"] => string(2) "WB"
    ["file"] => string(54) "/uploads/20260708/3ff6cf26a3bad91b7b0e155d7be6e9ed.pdf"
  }
}