length(feed) - phpMan

ftruncate (2)        - truncate a file to a specified length
ftruncate (3p)       - truncate a file to a specified length
ftruncate64 (2)      - truncate a file to a specified length
isosize (8)          - output the length of an iso9660 filesystem
MB_CUR_MAX (3)       - maximum length of a multibyte character in the current...
MB_LEN_MAX (3)       - maximum multibyte length of a character across all loc...
posix_mem_offset (3p) - find offset and length of a mapped typed memory block...
strcspn (3p)         - get the length of a complementary substring
strlen (3)           - calculate the length of a string
strlen (3p)          - get string length
strnlen (3)          - determine the length of a fixed-size string
strspn (3p)          - get length of a substring
tcfmgr (1)           - the command line utility of the fixed-length database API
tcfmttest (1)        - test cases of the fixed-length database API
tcftest (1)          - test cases of the fixed-length database API
Tie::SubstrHash (3pm) - Fixed-table-size, fixed-key-length hashing
truncate (2)         - truncate a file to a specified length
truncate (3p)        - truncate a file to a specified length
truncate64 (2)       - truncate a file to a specified length
wcscspn (3p)         - get the length of a complementary wide substring
wcslen (3)           - determine the length of a wide-character string
wcslen (3p)          - get wide-character string length
wcsnlen (3)          - determine the length of a fixed-size wide-character st...
wcsspn (3p)          - get the length of a wide substring