I try many days combine multiple images and simultaneously various data in which all saved in a table in mysql.
For example we have a form in HTML, PHP:
<form method="post" enctype="multipart/form-data">
    <input type="text" name="firstname">
    <input type="text" name="lastname">
    <input type="text" name="phone">
    <input type="file" name="images[]" multiple="multiple" accept="image/*" />
    <input type="submit" name="submit" value="Upload!" />
</form>
How can become the association between PHP and SQL?
<?php
include "config.php";
$erors = array();  // set an empty array that will contains the errors
// Check for form submission
if (isset($_POST['firtname']) && isset($_POST['lastname'])) {
  // chech if all form fields are filled in correctly
  // (email address and the minimum number of characters in "name" and "pass")
  if (strlen($_POST['firstname'])<3) $erors[] = 'Name must contain minimum 3 characters';
  if (strlen($_POST['lastname'])<6) $erors[] = 'Password must contain minimum 6 characters';
  // if no errors ($error array empty)
  if(count($erors)<1) {
    // store the values in an Array, escaping special characters for use in the SQL statement
    $adds['firstname'] = $mysqli->real_escape_string($_POST['firtname']);
    $adds['lastname'] = $mysqli->real_escape_string($_POST['lastname']);
    $adds['phone'] = $mysqli->real_escape_string($_POST['phone']);
    /*
    CODE FOR UPLOAD MULTIPLE IMAGES
    */
    // sql query for INSERT INTO users
    $sql = "INSERT INTO `insert_data` (`firstname`, `lastname`, `phone`) VALUES ('". $adds['firtname']. "', '". $adds['lastname']. "', '". $adds['phone']. "')";
    // Performs the $sql query on the server to insert the values
    if ($mysqli->query($sql) === TRUE) {
      echo 'users entry saved successfully';
    }
    else {
      echo 'Error: '. $mysqli->error;
    }
    $mysqli->close();
  }
  else {
    // else, if errors, it adds them in string format and print it
    echo implode('<br>', $erors);
  }
}
?>
CREATE TABLE IF NOT EXISTS `insert_data` (
  `id` int(9) NOT NULL AUTO_INCREMENT,
  `firstname` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `lastname` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `phone` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  /*
  HERE SAVED MULTIPLE IMAGES??
  */
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
I should be grateful to your help!!
Thanks!