Fatal error: Uncaught Error: Call to undefined function mysql_real_escape_string() in /home/web/textbook.hyungseul.com/lib/sql_func.lib:345 Stack trace: #0 [internal function]: mysql_real_escape_string_deep('978-89-5643-571...') #1 /home/web/textbook.hyungseul.com/lib/sql_func.lib(360): array_map('mysql_real_esca...', Array) #2 /home/web/textbook.hyungseul.com/_header.php(20): include('/home/web/textb...') #3 /home/web/textbook.hyungseul.com/include/onbook_02.html(2): include('/home/web/textb...') #4 {main} thrown in /home/web/textbook.hyungseul.com/lib/sql_func.lib on line 345