cmp(3) - phpMan

bcmp (3)             - compare byte sequences
bcmp (3p)            - memory operations (LEGACY)
bzcmp (1)            - compare bzip2 compressed files
cmp (1)              - compare two files byte by byte
cmp (1p)             - compare two files
icmp (7)             - Linux IPv4 ICMP kernel module.
infocmp (1m)         - compare or print out terminfo descriptions
kcmp (2)             - compare two processes to determine if they share a ker...
xzcmp (1)            - compare compressed files
memcmp (3)           - compare memory areas
memcmp (3p)          - compare bytes in memory
msgcmp (1)           - compare message catalog and template
ping (8)             - send ICMP ECHO_REQUEST to network hosts
ping6 (8)            - send ICMP ECHO_REQUEST to network hosts
strcasecmp (3)       - compare two strings ignoring case
strcasecmp (3p)      - case-insensitive string comparisons
strcmp (3)           - compare two strings
strcmp (3p)          - compare two strings
strncasecmp (3)      - compare two strings ignoring case
strncasecmp (3p)     - case-insensitive string comparisons
strncmp (3)          - compare two strings
strncmp (3p)         - compare part of two strings
strverscmp (3)       - compare two version strings
timercmp (3)         - timeval operations
wcscasecmp (3)       - compare two wide-character strings, ignoring case
wcscmp (3)           - compare two wide-character strings
wcscmp (3p)          - compare two wide-character strings
wcsncasecmp (3)      - compare two fixed-size wide-character strings, ignorin...
wcsncmp (3)          - compare two fixed-size wide-character strings
wcsncmp (3p)         - compare part of two wide-character strings
wmemcmp (3)          - compare two arrays of wide-characters
wmemcmp (3p)         - compare wide characters in memory
zcmp (1)             - compare compressed files
zipcmp (1)           - compare contents of zip archives