Fatal error: Allowed memory size of 8388608 bytes exhausted

showing error message when use FPDF library to create report php-pdf: "Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 6291456 bytes) in C:\AppServ\www\tcpdf13\unicode_data.php on line 16486"

here's the solution: search php.ini file then changes memory_limit = 8M to be 12M. stop the Apache services then start again.