Optimize unpack() for named fields (#6958)

Create name using either zend_init_string_fast (no repetitions) or by concatenating the name with zend_print_ulong_to_buf. This is much more effici

Optimize unpack() for named fields (#6958)

Create name using either zend_init_string_fast (no repetitions) or by concatenating the name with zend_print_ulong_to_buf. This is much more efficient than using snprintf. We also avoid repeated strlen() calculations.

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