How to insert multiple rows from array using CodeIgniter framework?

Assembling one INSERT statement with multiple rows is much faster in MySQL than one INSERT statement per row.

That said, it sounds like you might be running into string-handling problems in PHP, which is really an algorithm problem, not a language one. Basically, when working with large strings, you want to minimize unnecessary copying. Primarily, this means you want to avoid concatenation. The fastest and most memory efficient way to build a large string, such as for inserting hundreds of rows at one, is to take advantage of the implode() function and array assignment.

$sql = array(); 
foreach( $data as $row ) {
    $sql[] = '("'.mysql_real_escape_string($row['text']).'", '.$row['category_id'].')';
}
mysql_query('INSERT INTO table (text, category) VALUES '.implode(',', $sql));

The advantage of this approach is that you don't copy and re-copy the SQL statement you've so far assembled with each concatenation; instead, PHP does this once in the implode() statement. This is a big win.

If you have lots of columns to put together, and one or more are very long, you could also build an inner loop to do the same thing and use implode() to assign the values clause to the outer array.

Multiple insert/ batch insert is now supported by CodeIgniter.

$data = array(
   array(
      'title' => 'My title' ,
      'name' => 'My Name' ,
      'date' => 'My date'
   ),
   array(
      'title' => 'Another title' ,
      'name' => 'Another Name' ,
      'date' => 'Another date'
   )
);

$this->db->insert_batch('mytable', $data);

// Produces: INSERT INTO mytable (title, name, date) VALUES ('My title', 'My name', 'My date'), ('Another title', 'Another name', 'Another date')

You could prepare the query for inserting one row using the mysqli_stmt class, and then iterate over the array of data. Something like:

$stmt =  $db->stmt_init();
$stmt->prepare("INSERT INTO mytbl (fld1, fld2, fld3, fld4) VALUES(?, ?, ?, ?)");
foreach($myarray as $row)
{
    $stmt->bind_param('idsb', $row['fld1'], $row['fld2'], $row['fld3'], $row['fld4']);
    $stmt->execute();
}
$stmt->close();

Where 'idsb' are the types of the data you're binding (int, double, string, blob).

You could always use mysql's LOAD DATA:

LOAD DATA LOCAL INFILE '/full/path/to/file/foo.csv' INTO TABLE `footable` FIELDS TERMINATED BY ',' LINES TERMINATED BY '\r\n' 

to do bulk inserts rather than using a bunch of INSERT statements.

Well, you don't want to execute 1000 query calls, but doing this is fine:

$stmt= array( 'array of statements' );
$query= 'INSERT INTO yourtable (col1,col2,col3) VALUES ';
foreach( $stmt AS $k => $v ) {
  $query.= '(' .$v. ')'; // NOTE: you'll have to change to suit
  if ( $k !== sizeof($stmt)-1 ) $query.= ', ';
}
$r= mysql_query($query);

Depending on your data source, populating the array might be as easy as opening a file and dumping the contents into an array via file().

I had to INSERT more than 14000 rows into a table and found that line for line with Mysqli prepared statements took more than ten minutes, while argument unpacking with string parameters for the same Mysqli prepared statements did it in less than 10 seconds. My data was very repetitive as it was multiples of id's and one constant integer.

10 minutes code:

            $num = 1000;
            $ent = 4;
            $value = ['id' => 1,
                      'id' => 2,
                      'id' => 3,
                      'id' => 4,
                      'id' => 5,
                      'id' => 6,
                      'id' => 7,
                      'id' => 8,
                      'id' => 9,
                      'id' => 10,
                      'id' => 11,
                      'id' => 12,
                      'id' => 13,
                      'id' => 14];
            $cnt = 0;
            $query = "INSERT INTO table (col1, col2) VALUES (?,?)";
            $stmt = $this->db->prepare($query);
            $stmt->bind_param('ii', $arg_one,$arg_two);
                    foreach ($value as $k => $val) {
                         for ($i=0; $i < $num; $i++) { 
                            $arg_one = $k;
                            $arg_two = $ent;
                            if($stmt->execute()) {
                                $cnt++;
                            }
                        }
                    }

10 second code:

            $ent = 4;
            $num = 1000;
            $value = ['id' => 1,
                      'id' => 2,
                      'id' => 3,
                      'id' => 4,
                      'id' => 5,
                      'id' => 6,
                      'id' => 7,
                      'id' => 8,
                      'id' => 9,
                      'id' => 10,
                      'id' => 11,
                      'id' => 12,
                      'id' => 13,
                      'id' => 14];
             $newdat = [];
             foreach ($value as $k => $val) {
                 for ($i=0; $i < $num; $i++) {
                    $newdat[] = $val;
                    $newdat[] = $ent;
                 }
             }
            // create string of data types
            $cnt = count($newdat);
            $param = str_repeat('i',$cnt);
            // create string of question marks
            $rec = (count($newdat) == 0) ? 0 : $cnt / 2 - 1;
            $id_q = str_repeat('(?,?),', $rec) . '(?,?)';
            // insert
            $query = "INSERT INTO table (col1, col2) VALUES $id_q";
            $stmt = $db->prepare($query);
            $stmt->bind_param($param, ...$newdat);
            $stmt->execute();