<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* Set the default character set */
$mysqli->set_charset('utf8mb4');

/* Print current character set */
$charset = $mysqli->character_set_name();
printf("Current character set is %s\n", $charset);

<?php

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = mysqli_connect("localhost", "my_user", "my_password", "world");

/* Set the default character set */
mysqli_set_charset($mysqli, 'utf8mb4');

/* Print current character set */
$charset = mysqli_character_set_name($mysqli);
printf("Current character set is %s\n", $charset);