PHP connect to the database

PHP7 has not mysql_connect to create the database. Instead, use mysql_connect to create the database.

Here only way to create the database:

Database connections:

　　　$mysqli = new mysqli('localhost', 'root', '1111', 'lib');

Mysql query statement:

　　　$res = $mysqli->query('select * from tb_student');

Reading three functions:

mysql_assoc: Fetch a row from the result as an associative array

mysql_array: Fetch row from the results as an associative array, a numeric array, or both

mysql_row: Fetch a row from the result as a numeric array

Read the results of which are:

First, you can read line by line:

　　print_r(mysqli_fetch_assoc($res));

Two, can be read out together, and then have to cycle:　　

　　$n = 0;
　　while($n < mysqli_num_rows($res)){
　　echo $row[$n]['stu_num'].$row[$n]['name']."\n";
　　// echo "string";
　　$n++;
　　}