PHP And MySQL: Escape Strings Doesn't Work

PHP And MySQL: Escape Strings Doesn't Work

I use PHP to insert an entry in a MySQL database. I escape the strings
with mysql_real_escape_string but it doesn't work.
Here ist my query:
INSERT INTO table (value1,value2,value3) VALUES ('abc','abc,'abc')
But MySQL says:
ERROR: Unknown Punctuation
STR: ://
Thanks for hints!