How to query a certain field in php

How to query a certain field in php: 1. Query data through the "select * from" statement; 2. Read the value through "$student_value['period'];"; 3. Through "echo $ Period;" can be used to output the query results.

The operating environment of this article: Windows 7 system, PHP version 7.1, Dell G3 computer

How to query a certain field in php?

php Returns a certain field in the query result

The code is as follows:

    global $mysql;
//查询
    $sql = "select * from `bookTable` where student_id = '".$student_id."'";
    $student_value = $mysql->getLine( $sql );
//读值
    $period = $student_value['period'];
    $state = $student_value['state'];
//输出
    echo $period;

or

   $sql = "SELECT * FROM  `cabinet` WHERE state_M =0 LIMIT 0 , 1";
   $data = $mysql->getData( $sql );
   $cabinet_id = $data[0]['cabinet_id'];

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