I use in my script serialized data from database, for example, data which was serialized by function 'serialize' set in 'DATA' field.

Sample code:
...
$Ser=mssql_result($MyResult,0,"DATA");
eval("\$Over=\$Ser;");
...

Parser error is occured after dinamic code evaluation.
As you wrote in incompatible features list '{' and '}' symbols used for string encapsulation. But same symbols  used as delimiters in serialization value. I changed souse code of
'serialize' and 'unserialize' functions. I Changed '{' and '}' delimiters to '[' and ']' delimiters. After rebuild sample code written above work without errors.