Insert multiple rows using single query - php

Question

I want to insert multipl rows in single query.
$firstname = array('Arfan','Awais','Ahmad'.....);
$lastname = array('Haider','k','Raza'..........);
Insert Data:
INSERT INTO `table_nmae`(firstname,lastname)
VALUES
('Arfan','Haider'),('Awais','k'),('Ahmad','Raza');
I can do it very easily if these are only three record.
If I did not know how many records are present then I can not able to use the above.
Then what I did do?
UPDATE:
If I can not know the numbers of record in array.I can simply use foreach loop to do this
But this decrease the performance.
foreach($firstname as $f){
foreach($lastname as $l){
INSERT INTO `table_name`(firstname,lastname)
VALUES('$f','$l');
}
}
Now this time I am using multi query.I think single query is good to performance.
FOR ONE COLUMN:
If I had only one column it is very easy to use single query for this.
INSERT INTO `table_name`(firstname) VALUES
.implode(',', $firstname);
But here is multi column how can I do that for those.
Thanks.....

Answer 1

Use for loop if $firstname and $lastname array are of same length
$str = "INSERT INTO `table_nmae`(firstname,lastname) VALUES"; // create string of query
for($i = 0 ;$i< count($firstname); $i++) {
$str .= "('" . $firstname[$i] . "','" . $lastname[$i] . "'),"; //append the values
}
$str = trim($str, ","); // remove last ,

Answer 2

Try
$size_of_array = count( $firstname );
$query = "INSERT INTO `table_nmae`(firstname,lastname) VALUES ";
for($i = 0; $i < $size_of_array; $i++ )
{
if( $i !== ($size_of_array-1))
$query .= "('{$firstname[$i]}', '{$lastname[$i]}'),";
else
$query .= "('{$firstname[$i]}', '{$lastname[$i]}')";
}
echo $query;
?>

Answer 3

Suppose you have array of values e.g. $values_arr.
$count = count( $values_arr );
$query = "INSERT INTO `table_nmae`(firstname,lastname) VALUES ";
for($i = 0; $i < $count; $i++ )
{
if( $i == 0)
$query .= "('{$values_arr[$i]['firstname']}', '{$values_arr[$i]['lastname']}')";
else
$query .= ",('{$values_arr[$i]['firstname']}', '{$values_arr[$i]['lastname']}')";
}
echo $query;