<?php 
error_reporting(0);
require_once './classes/class_query_teacher_select_courses.php';
require_once './classes/class_query_table_name.php';
$tableName = $_POST["tableName"];
$workNumber = $_POST["workNumber"];
session_start();
$ident = $_SESSION["id"];
if ($ident == "user_teacher") {
    $queryTeachers = new QueryTeacherSelectCourses();
    $queryTeachers->queryTeacher($tableName, $workNumber, $ident);
} else {
    $query = new QueryTableName();
    $tableName = "cb_" . $tableName;
    $query->queryT($tableName);
}
<?php 
error_reporting(0);
require_once './classes/class_query_teacher_select_courses.php';
require_once './classes/class_query_table_name.php';
$tableName = $_POST["tableName"];
$workNumber = $_POST["workNumber"];
session_start();
$ident = $_SESSION["id"];
if ($ident == "user_teacher") {
    $queryTeachers = new QueryTeacherSelectCourses();
    $queryTeachers->queryTeacher($tableName, $workNumber);
} else {
    $query = new QueryTableName();
    $tableName = "cb_" . $tableName;
    $query->queryT($tableName);
}