如何把一个sql文件里的内容通过php代码执行

if (@$link= mysql_connect("$host","$name","$pwd")){
$db_selected = mysql_select_db("$db", $link);
if($db_selected){
$sql="drop database ".$post['db'];
mysql_query($sql);
}
$sql="create database ".$post['db'];
mysql_query($sql);
$file=file_get_contents('./assets/we3.sql');
$arr=explode('-- ----------------------------',$file);
$db_selected = mysql_select_db($post['db'], $link);
for($i=0;$i<count($arr);$i++){
if($i%2==0){
$a=explode(";",trim($arr[$i]));
array_pop($a);
foreach($a as $v){
mysql_query($v);
}
}
}
$str="<?php
return [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host=".$post['dbhost'].";port=3306;dbname=".$post['db']."',
'username' => '".$post['dbname']."',
'password' => '".$post['dbpwd']."',
'charset' => 'utf8',
'tablePrefix' => 'we_',   //加入前缀名称we_
];";
file_put_contents('../config/db.php',$str);
$sql="insert into we_user (uname,upwd) VALUES ('$uname','$upwd')";
mysql_query($sql);
mysql_close($link);
$counter_file       =   'assets/existence.php';//文件名及路径,在当前目录下新建aa.txt文件
$fopen                     =   fopen($counter_file,'wb');//新建文件命令
fputs($fopen,   'aaaaaa ');//向文件中写入内容;
fclose($fopen);
$this->redirect(array('/login/login'));
}else{
echo "<script>
if(alert('数据库账号或密码错误')){
location.href='index.php?r=install/two';
}else{
location.href='index.php?r=install/two';
}
</script>";

}