char(index.php) - phpMan

_tolower (3p)        - transliterate uppercase characters to lowercase
_toupper (3p)        - transliterate lowercase characters to uppercase
armscii-8 (7)        - Armenian character set encoded in octal, decimal, and ...
asa (1p)             - interpret carriage-control characters
ascii (7)            - ASCII character set encoded in octal, decimal, and hex...
bootchart.conf (5)   - Boot performance analysis graphing tool configuration ...
bootchart.conf.d (5) - Boot performance analysis graphing tool configuration ...
btowc (3)            - convert single byte to wide character
btowc (3p)           - single byte to wide character conversion
bytes (3pm)          - Perl pragma to force byte semantics rather than charac...
charmap (5)          - character symbols to define character encodings
charnames (3pm)      - access to Unicode character names and named character ...
charsets (7)         - programmer's view of character sets and internationali...
cp1251 (7)           - CP 1251 character set encoded in octal, decimal, and h...
ctype.h (0p)         - character types
Encode (3pm)         - character encodings in Perl
fgetc (3)            - input of characters and strings
fgets (3)            - input of characters and strings
fgetwc (3)           - read a wide character from a FILE stream
fgetwc (3p)          - get a wide-character code from a stream
fgetws (3)           - read a wide-character string from a FILE stream
fgetws (3p)          - get a wide-character string from a stream
fputc (3)            - output of characters and strings
fputs (3)            - output of characters and strings
fputwc (3)           - write a wide character to a FILE stream
fputwc (3p)          - put a wide-character code on a stream
fputws (3)           - write a wide-character string to a FILE stream
fputws (3p)          - put a wide-character string on a stream
fwprintf (3)         - formatted wide-character output conversion
fwprintf (3p)        - print formatted wide-character output
fwscanf (3p)         - convert formatted wide-character input
getc (3)             - input of characters and strings
getchar (3)          - input of characters and strings
getchar (3p)         - get a byte from a stdin stream
getchar_unlocked (3) - nonlocking stdio functions
getchar_unlocked (3p) - stdio with explicit client locking
Getopt::Std (3pm)    - Process single-character switches with switch clustering
gets (3)             - input of characters and strings
getwc (3)            - read a wide character from a FILE stream
getwc (3p)           - get a wide character from a stream
getwchar (3)         - read a wide character from standard input
getwchar (3p)        - get a wide character from a stdin stream
getwchar_unlocked (3) - nonlocking stdio functions
iconv (3)            - perform character set conversion
iconv_close (3)      - deallocate descriptor for character set conversion
iconv_open (3)       - allocate descriptor for character set conversion
identify (1)         - describes the format and characteristics of one or mor...
index (3)            - locate character in string
index (3p)           - character string operations (LEGACY)
IO::HTML (3pm)       - Open an HTML file with automatic charset detection
isalnum (3)          - character classification routines
isalnum (3p)         - test for an alphanumeric character
isalpha (3)          - character classification routines
isalpha (3p)         - test for an alphabetic character
isascii (3)          - character classification routines
isascii (3p)         - test for a 7-bit US-ASCII character
isblank (3)          - character classification routines
isblank (3p)         - test for a blank character
iscntrl (3)          - character classification routines
iscntrl (3p)         - test for a control character
isdigit (3)          - character classification routines
isgraph (3)          - character classification routines
isgraph (3p)         - test for a visible character
islower (3)          - character classification routines
iso-8859-1 (7)       - ISO 8859-1 character set encoded in octal, decimal, an...
iso-8859-10 (7)      - ISO 8859-10 character set encoded in octal, decimal, a...
iso-8859-11 (7)      - ISO 8859-11 character set encoded in octal, decimal, a...
iso-8859-13 (7)      - ISO 8859-13 character set encoded in octal, decimal, a...
iso-8859-14 (7)      - ISO 8859-14 character set encoded in octal, decimal, a...
iso-8859-15 (7)      - ISO 8859-15 character set encoded in octal, decimal, a...
iso-8859-16 (7)      - ISO 8859-16 character set encoded in octal, decimal, a...
iso-8859-2 (7)       - ISO 8859-2 character set encoded in octal, decimal, an...
iso-8859-3 (7)       - ISO 8859-3 character set encoded in octal, decimal, an...
iso-8859-4 (7)       - ISO 8859-4 character set encoded in octal, decimal, an...
iso-8859-5 (7)       - ISO 8859-5 character set encoded in octal, decimal, an...
iso-8859-6 (7)       - ISO 8859-6 character set encoded in octal, decimal, an...
iso-8859-7 (7)       - ISO 8859-7 character set encoded in octal, decimal, an...
iso-8859-8 (7)       - ISO 8859-8 character set encoded in octal, decimal, an...
iso-8859-9 (7)       - ISO 8859-9 character set encoded in octal, decimal, an...
iso_8859-1 (7)       - ISO 8859-1 character set encoded in octal, decimal, an...
iso_8859-10 (7)      - ISO 8859-10 character set encoded in octal, decimal, a...
iso_8859-11 (7)      - ISO 8859-11 character set encoded in octal, decimal, a...
iso_8859-13 (7)      - ISO 8859-13 character set encoded in octal, decimal, a...
iso_8859-14 (7)      - ISO 8859-14 character set encoded in octal, decimal, a...
iso_8859-15 (7)      - ISO 8859-15 character set encoded in octal, decimal, a...
iso_8859-16 (7)      - ISO 8859-16 character set encoded in octal, decimal, a...
iso_8859-2 (7)       - ISO 8859-2 character set encoded in octal, decimal, an...
iso_8859-3 (7)       - ISO 8859-3 character set encoded in octal, decimal, an...
iso_8859-4 (7)       - ISO 8859-4 character set encoded in octal, decimal, an...
iso_8859-5 (7)       - ISO 8859-5 character set encoded in octal, decimal, an...
iso_8859-6 (7)       - ISO 8859-6 character set encoded in octal, decimal, an...
iso_8859-7 (7)       - ISO 8859-7 character set encoded in octal, decimal, an...
iso_8859-8 (7)       - ISO 8859-8 character set encoded in octal, decimal, an...
iso_8859-9 (7)       - ISO 8859-9 character set encoded in octal, decimal, an...
iso_8859_1 (7)       - ISO 8859-1 character set encoded in octal, decimal, an...
iso_8859_10 (7)      - ISO 8859-10 character set encoded in octal, decimal, a...
iso_8859_11 (7)      - ISO 8859-11 character set encoded in octal, decimal, a...
iso_8859_13 (7)      - ISO 8859-13 character set encoded in octal, decimal, a...
iso_8859_14 (7)      - ISO 8859-14 character set encoded in octal, decimal, a...
iso_8859_15 (7)      - ISO 8859-15 character set encoded in octal, decimal, a...
iso_8859_16 (7)      - ISO 8859-16 character set encoded in octal, decimal, a...
iso_8859_2 (7)       - ISO 8859-2 character set encoded in octal, decimal, an...
iso_8859_3 (7)       - ISO 8859-3 character set encoded in octal, decimal, an...
iso_8859_4 (7)       - ISO 8859-4 character set encoded in octal, decimal, an...
iso_8859_5 (7)       - ISO 8859-5 character set encoded in octal, decimal, an...
iso_8859_6 (7)       - ISO 8859-6 character set encoded in octal, decimal, an...
iso_8859_7 (7)       - ISO 8859-7 character set encoded in octal, decimal, an...
iso_8859_8 (7)       - ISO 8859-8 character set encoded in octal, decimal, an...
iso_8859_9 (7)       - ISO 8859-9 character set encoded in octal, decimal, an...
isprint (3)          - character classification routines
isprint (3p)         - test for a printable character
ispunct (3)          - character classification routines
ispunct (3p)         - test for a punctuation character
isspace (3)          - character classification routines
isspace (3p)         - test for a white-space character
isupper (3)          - character classification routines
iswalnum (3)         - test for alphanumeric wide character
iswalnum (3p)        - test for an alphanumeric wide-character code
iswalpha (3)         - test for alphabetic wide character
iswalpha (3p)        - test for an alphabetic wide-character code
iswblank (3)         - test for whitespace wide character
iswblank (3p)        - test for a blank wide-character code
iswcntrl (3)         - test for control wide character
iswcntrl (3p)        - test for a control wide-character code
iswctype (3)         - wide-character classification
iswctype (3p)        - test character for a specified class
iswdigit (3)         - test for decimal digit wide character
iswdigit (3p)        - test for a decimal digit wide-character code
iswgraph (3)         - test for graphic wide character
iswgraph (3p)        - test for a visible wide-character code
iswlower (3)         - test for lowercase wide character
iswlower (3p)        - test for a lowercase letter wide-character code
iswprint (3)         - test for printing wide character
iswprint (3p)        - test for a printable wide-character code
iswpunct (3)         - test for punctuation or symbolic wide character
iswpunct (3p)        - test for a punctuation wide-character code
iswspace (3)         - test for whitespace wide character
iswspace (3p)        - test for a white-space wide-character code
iswupper (3)         - test for uppercase wide character
iswupper (3p)        - test for an uppercase letter wide-character code
iswxdigit (3)        - test for hexadecimal digit wide character
iswxdigit (3p)       - test for a hexadecimal digit wide-character code
isxdigit (3)         - character classification routines
koi8-r (7)           - Russian character set encoded in octal, decimal, and h...
koi8-u (7)           - Ukrainian character set encoded in octal, decimal, and...
latin1 (7)           - ISO 8859-1 character set encoded in octal, decimal, an...
latin10 (7)          - ISO 8859-16 character set encoded in octal, decimal, a...
latin2 (7)           - ISO 8859-2 character set encoded in octal, decimal, an...
latin3 (7)           - ISO 8859-3 character set encoded in octal, decimal, an...
latin4 (7)           - ISO 8859-4 character set encoded in octal, decimal, an...
latin5 (7)           - ISO 8859-9 character set encoded in octal, decimal, an...
latin6 (7)           - ISO 8859-10 character set encoded in octal, decimal, a...
latin7 (7)           - ISO 8859-13 character set encoded in octal, decimal, a...
latin8 (7)           - ISO 8859-14 character set encoded in octal, decimal, a...
latin9 (7)           - ISO 8859-15 character set encoded in octal, decimal, a...
lessecho (1)         - expand metacharacters
linux-boot-prober (1) - Determine boot characteristics of a specified device.
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...
mblen (3)            - determine number of bytes in next multibyte character
mblen (3p)           - get number of bytes in a character
mbrlen (3)           - determine number of bytes in next multibyte character
mbrlen (3p)          - get number of bytes in a character (restartable)
mbrtowc (3)          - convert a multibyte sequence to a wide character
mbrtowc (3p)         - convert a character to a wide-character code (restarta...
mbsnrtowcs (3)       - convert a multibyte string to a wide-character string
mbsrtowcs (3)        - convert a multibyte string to a wide-character string
mbsrtowcs (3p)       - convert a character string to a wide-character string ...
mbstowcs (3)         - convert a multibyte string to a wide-character string
mbstowcs (3p)        - convert a character string to a wide-character string
mbtowc (3)           - convert a multibyte sequence to a wide character
mbtowc (3p)          - convert a character to a wide-character code
memchr (3)           - scan memory for a character
memrchr (3)          - scan memory for a character
mknod (1)            - make block or character special files
msgconv (1)          - character set conversion for message catalog
pam_succeed_if (8)   - test account characteristics
perlrecharclass (1)  - Perl Regular Expression Character Classes
perluniprops (1)     - Index of Unicode Version 6.1.0 character properties in...
psfaddtable (1)      - add a Unicode character table to a console font
psfgettable (1)      - extract the embedded Unicode character table from a co...
psfstriptable (1)    - remove the embedded Unicode character table from a con...
psfxtable (1)        - handle Unicode character tables for console fonts
putc (3)             - output of characters and strings
putchar (3)          - output of characters and strings
putchar (3p)         - put a byte on a stdout stream
putchar_unlocked (3) - nonlocking stdio functions
putchar_unlocked (3p) - stdio with explicit client locking
puts (3)             - output of characters and strings
putwc (3)            - write a wide character to a FILE stream
putwc (3p)           - put a wide character on a stream
putwchar (3)         - write a wide character to standard output
putwchar (3p)        - put a wide character on a stdout stream
putwchar_unlocked (3) - nonlocking stdio functions
raw (8)              - bind a Linux raw character device
rawdevices (8)       - bind a Linux raw character device
rawmemchr (3)        - scan memory for a character
rindex (3)           - locate character in string
rindex (3p)          - character string operations (LEGACY)
strchr (3)           - locate character in string
strchrnul (3)        - locate character in string
strings (1)          - print the strings of printable characters in files.
strrchr (3)          - locate character in string
swprintf (3)         - formatted wide-character output conversion
swprintf (3p)        - print formatted wide-character output
swscanf (3p)         - convert formatted wide-character input
systemd-bootchart (1) - Boot performance graphing tool
tis-620 (7)          - ISO 8859-11 character set encoded in octal, decimal, a...
toascii (3)          - convert character to ASCII
toascii (3p)         - translate an integer to a 7-bit ASCII character
tolower (3p)         - transliterate uppercase characters to lowercase
toupper (3p)         - transliterate lowercase characters to uppercase
towctrans (3)        - wide-character transliteration
towctrans (3p)       - wide-character transliteration
towlower (3)         - convert a wide character to lowercase
towlower (3p)        - transliterate uppercase wide-character code to lowercase
towupper (3)         - convert a wide character to uppercase
towupper (3p)        - transliterate lowercase wide-character code to uppercase
tput (1p)            - change terminal characteristics
tr (1)               - translate or delete characters
tr (1p)              - translate characters
ungetc (3)           - input of characters and strings
ungetwc (3)          - push back a wide character onto a FILE stream
ungetwc (3p)         - push wide-character code back into the input stream
unicode (7)          - universal character set
Unicode::UCD (3pm)   - Unicode character database
URI::Escape (3pm)    - Percent-encode and percent-decode unsafe characters
vfwprintf (3)        - formatted wide-character output conversion
vfwprintf (3p)       - wide-character formatted output of a stdarg argument list
vfwscanf (3p)        - wide-character formatted input of a stdarg argument list
vswprintf (3)        - formatted wide-character output conversion
vswprintf (3p)       - wide-character formatted output of a stdarg argument list
vswscanf (3p)        - wide-character formatted input of a stdarg argument list
vwprintf (3)         - formatted wide-character output conversion
vwprintf (3p)        - wide-character formatted output of a stdarg argument list
vwscanf (3p)         - wide-character formatted input of a stdarg argument list
wc (1p)              - word, line, and byte or character count
wchar.h (0p)         - wide-character handling
wcpcpy (3)           - copy a wide-character string, returning a pointer to i...
wcpncpy (3)          - copy a fixed-size string of wide characters, returning...
wcrtomb (3)          - convert a wide character to a multibyte sequence
wcrtomb (3p)         - convert a wide-character code to a character (restarta...
wcscasecmp (3)       - compare two wide-character strings, ignoring case
wcscat (3)           - concatenate two wide-character strings
wcscat (3p)          - concatenate two wide-character strings
wcschr (3)           - search a wide character in a wide-character string
wcschr (3p)          - wide-character string scanning operation
wcscmp (3)           - compare two wide-character strings
wcscmp (3p)          - compare two wide-character strings
wcscoll (3p)         - wide-character string comparison using collating infor...
wcscpy (3)           - copy a wide-character string
wcscpy (3p)          - copy a wide-character string
wcscspn (3)          - search a wide-character string for any of a set of wid...
wcsdup (3)           - duplicate a wide-character string
wcsftime (3p)        - convert date and time to a wide-character string
wcslen (3)           - determine the length of a wide-character string
wcslen (3p)          - get wide-character string length
wcsncasecmp (3)      - compare two fixed-size wide-character strings, ignorin...
wcsncat (3)          - concatenate two wide-character strings
wcsncat (3p)         - concatenate a wide-character string with part of another
wcsncmp (3)          - compare two fixed-size wide-character strings
wcsncmp (3p)         - compare part of two wide-character strings
wcsncpy (3)          - copy a fixed-size string of wide characters
wcsncpy (3p)         - copy part of a wide-character string
wcsnlen (3)          - determine the length of a fixed-size wide-character st...
wcsnrtombs (3)       - convert a wide-character string to a multibyte string
wcspbrk (3)          - search a wide-character string for any of a set of wid...
wcspbrk (3p)         - scan a wide-character string for a wide-character code
wcsrchr (3)          - search a wide character in a wide-character string
wcsrchr (3p)         - wide-character string scanning operation
wcsrtombs (3)        - convert a wide-character string to a multibyte string
wcsrtombs (3p)       - convert a wide-character string to a character string ...
wcsspn (3)           - advance in a wide-character string, skipping any of a ...
wcsstr (3)           - locate a substring in a wide-character string
wcsstr (3p)          - find a wide-character substring
wcstod (3p)          - convert a wide-character string to a double-precision ...
wcstof (3p)          - convert a wide-character string to a double-precision ...
wcstoimax (3)        - convert wide-character string to integer
wcstoimax (3p)       - convert a wide-character string to an integer type
wcstok (3)           - split wide-character string into tokens
wcstok (3p)          - split a wide-character string into tokens
wcstol (3p)          - convert a wide-character string to a long integer
wcstold (3p)         - convert a wide-character string to a double-precision ...
wcstoll (3p)         - convert a wide-character string to a long integer
wcstombs (3)         - convert a wide-character string to a multibyte string
wcstombs (3p)        - convert a wide-character string to a character string
wcstoul (3p)         - convert a wide-character string to an unsigned long
wcstoull (3p)        - convert a wide-character string to an unsigned long
wcstoumax (3)        - convert wide-character string to integer
wcstoumax (3p)       - convert a wide-character string to an integer type
wcswidth (3)         - determine columns needed for a fixed-size wide-charact...
wcswidth (3p)        - number of column positions of a wide-character string
wcsxfrm (3p)         - wide-character string transformation
wctob (3)            - try to represent a wide character as a single byte
wctob (3p)           - wide-character to single-byte conversion
wctomb (3)           - convert a wide character to a multibyte sequence
wctomb (3p)          - convert a wide-character code to a character
wctrans (3)          - wide-character translation mapping
wctrans (3p)         - define character mapping
wctype (3)           - wide-character classification
wctype (3p)          - define character class
wctype.h (0p)        - wide-character classification and mapping utilities
wcwidth (3)          - determine columns needed for a wide character
wcwidth (3p)         - number of column positions of a wide-character code
wmemchr (3)          - search a wide character in a wide-character array
wmemchr (3p)         - find a wide character in memory
wmemcmp (3)          - compare two arrays of wide-characters
wmemcmp (3p)         - compare wide characters in memory
wmemcpy (3)          - copy an array of wide-characters
wmemcpy (3p)         - copy wide characters in memory
wmemmove (3)         - copy an array of wide-characters
wmemmove (3p)        - copy wide characters in memory with overlapping areas
wmemset (3)          - fill an array of wide-characters with a constant wide ...
wmemset (3p)         - set wide characters in memory
wprintf (3)          - formatted wide-character output conversion
wprintf (3p)         - print formatted wide-character output
wscanf (3p)          - convert formatted wide-character input
xdr_char (3)         - library routines for external data representation
xdr_u_char (3)       - library routines for external data representation