for($i=1;$i<=100;$i++){
 $sql = 'insert...............';
 //querysql
}
foreach($arr as $key => $value){
$sql = 'insert...............';
 //querysql
}
while($i <= 100){
$sql = 'insert...............';
 //querysql
 $i++
}

//这里假设arr的key和数据库字段同步，其实大多数框架中在php操作数据库的时候都是这么设计的
$arr_keys  = array_keys($arr);
$sql    = 'INSERT INTO tablename (' . implode(',' ,$arr_keys) . ') values';
$arr_values  = array_values($arr);
$sql    .= " ('" . implode("','" ,$arr_values) . "'),";
$sql    = substr($sql ,0 ,-1);
//拼接之后大概就是 INSERT INTO tablename ('username','password') values 
('xxx','xxx'),('xxx','xxx'),('xxx','xxx'),('xxx','xxx'),('xxx','xxx'),('xxx','xxx')
.......
//querysql

delimiter $$$
create procedure zqtest()
begin
declare i int default 0;
set i=0;
start transaction;
while i<80000 do
 //your insert sql 
set i=i+1;
end while;
commit;
end
$$$
delimiter;
call zqtest();

//设置pdo开启MYSQL_ATTR_LOCAL_INFILE
/*hs96.cn@gmail.com
public function pdo_local_info ()
{
  global $system_dbserver;
  $dbname = 'hs96.cn@gmail.com';
  $ip  = 'hs96.cn@gmail.com';
  $user = 'hs96.cn@gmail.com';
  $pwd  = 'hs96.cn@gmail.com';
  $dsn  = 'mysql:dbname=' . $dbname . ';host=' . $ip . ';port=3306';
  $options = [PDO::MYSQL_ATTR_LOCAL_INFILE => true];
  $db  = new PDO($dsn ,$user ,$pwd ,$options);
  return $db;
 }
//伪代码如下
public function test(){
  $arr_keys   = array_keys($arr);
  $root_dir   = $_SERVER["DOCUMENT_ROOT"] . '/';
  $my_file   = $root_dir . "hs96.cn@gmail.com/sql_cache/" . $order['OrderNo'] . '.sql';
  $fhandler   = fopen($my_file,'a+');
  if ($fhandler) {
  $sql = implode("\t" ,$arr);
   $i = 1;
   while ($i <= 80000)
   {
    $i++;
    fwrite($fhandler ,$sql . "\r\n");
   }
   $sql = "LOAD DATA local INFILE '" . $myFile . "' INTO TABLE ";
   $sql .= "tablename (" . implode(',' ,$arr_keys) . ")";
   $pdo = $this->pdo_local_info ();
   $res = $pdo->exec($sql);
   if (!$res) {
    //TODO 插入失败
   }
   @unlink($my_file);
  }
}