The error of "Fatal error:allowed memory size of 8388608 bytes exhausted (tried to allocate 775920 bytes)" appears first of all to check if your PHP program has a dead loop 。
Solution (three kinds):
I. Modification of php.ini (recommended)
Memory_limit = 12M
Second, add the following statement inside the program
Ini_set (' Memory_limit ', ' 12M ');
Third, in the root directory establishment
. htaccess file, add the following
Php_value Memory_limit 12M
If it can't be solved, change it to a little bit bigger.
The final note is to reboot the server.