$sql="SELECT * FROM bb where true ";

<td>商品名称：</td> 
<td width="200"><input type="text" class="text" name="kit_name" id="fn_kit_name"/></td> 
<td align="right">备案开始日期：</td> 
<td width="200"><input type="text" name="search[or_get_reg_date]"/><img src="/UploadFiles/2021-04-02/data.jpg">

<"or_") !== false) { //添加or连接符 
      $terms['useOr'] = true; 
      $name = str_replace("or_", "", $term); 
    } 
 
    if (strpos($name, "in_") !== false) { 
      $terms['name'] = str_replace("in_", "", $name); 
      $terms['charCal'] = " in "; 
      $terms['value'] = "('" . implode("','", $value) . "')"; 
    } else { 
      $terms['name'] = $name; 
      $terms['charCal'] = " like "; 
      $terms['value'] = "'" . trim($value) . "%'"; 
    } 
    //放在else后面 
    foreach($separator as $charCalName =>$charCalVal){ 
      if (strpos($name, $charCalName."_") !== false) { 
        $terms['name'] = str_replace($charCalName."_", "", $name); 
        $terms['charCal'] = $charCalVal; 
        $terms['value'] = "'" . trim($value) . "'"; 
      } 
    } 
    $aryRst[] = $terms; 
    unset($terms); 
  } 
  return $aryRst; 
} 
 
function whereOperator($has_where, $useOr) { 
  $operator = $has_where ? ($useOr === false ? ' AND ' : ' OR ') : ' WHERE '; 
  return $operator; 
} 
 
/** 
 * aryTerm transArrayTerms转化后的查询条件 
 * @过滤没有输入的sql查询条件并转化成where条件. 
 */ 
function getWhereSql($aryTerm) { 
  $whereCause = ''; 
  if (count($aryTerm) > 0) { 
    $has_where = ''; 
    foreach ($aryTerm as $value) { 
      $has_where = whereOperator($has_where, isset($value['useOr'])); 
      $whereCause .= $has_where . $value['name'] . $value['charCal'] . $value['value']; 
    } 
  } 
  return $whereCause; 
}