php数组插入数据库这个功能该怎么实现

原文网址:https://segmentfault.com/q/1010000004048449

比如一个数组
$a=array("a"=>"1","b"=>"2","c"=>"3");
现在想执行数据库插入语句insert into admin(a,b,c) values(1,2,3);该怎么实现？

1.

$keys;
$value;
$keys = implode(",", array_keys($a));
$value = implode(",",array_values($a));

$db->query("insert into admin(".$keys.") values(".$value.")")

2.

$a=array("a"=>"1","b"=>"2","c"=>"3");
$values=implode(',',array_values($a));
$keys="'".implode("','",array_keys($a))."'";
$sql='insert into admin';
$sql.='('.$keys.') ';
$sql.='values ';
$sql.='('.$values.') ';

3.

 写个方法:

function insert（$table,$data){
    foreach($data as $k => $v){
            $fields[] = $v;
            $keys[] = $k;
    }
    $values = "('".implode("','", $fields)."')";
    $column = "(`".implode("`,`", $keys)."`)";
    $sql = "insert into {$table} {$column} values {$values}";
    $this->query($sql);
}