PHP connects to the database, mysql_connect cannot be used

Question

php connects to the database, mysql_connect cannot use the integrated environment used by

##, originally there is no The text in the red box was added by Baidu Query, and the file is in the folder.

mysql has no problem. .

Excuse me, God, what is the reason for this

Answer 1

It's done, it's a shame, because mysql is no longer supported after version 7, and I haven't done this for many years. . I don’t know, I’ll use mysqli instead.

Answer 2

Have you specified that library?