[Solved] Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: A link to the server could not be established in [duplicate]

mysql_real_escape_string() needs an active connection to the MySQL server and will initiate one with the default data from the php.ini configuration if there is none. Do not use this function without first connecting to the database. Also, do not use the mysql_* functions. They are deprecated and will be removed from PHP. 2 solved Warning: … Read more

(Solved) What is an undefined reference/unresolved external symbol error and how do I fix it?

Compiling a C++ program takes place in several steps, as specified by 2.2 (credits to Keith Thompson for the reference): The precedence among the syntax rules of translation is specified by the following phases [see footnote]. Physical source file characters are mapped, in an implementation-defined manner, to the basic source character set (introducing new-line characters … Read more