PHP addcslashes function

addcslashes

(PHP 4, PHP 5)

addcslashes -- Quote string with slashes in a C styleDescriptionstring addcslashes ( string str, string charlist )

Returns a string with backslashes before characters that are
listed in charlist parameter. If
charlist contains characters
\n, \r etc., they are
converted in C-like style, while other non-alphanumeric characters
with ASCII codes lower than 32 and higher than 126 converted to
octal representation.

Be careful if you choose to escape characters 0, a, b, f, n, r,
t and v. They will be converted to \0, \a, \b, \f, \n, \r, \t
and \v.
In PHP \0 (NULL), \r (carriage return), \n (newline) and \t (tab)
are predefined escape sequences, while in C all of these are
predefined escape sequences.

charlist like "\0..\37", which would
escape all characters with ASCII code between 0 and 31.

Example 1. addcslashes() example

When you define a sequence of characters in the charlist argument
make sure that you know what characters come between the
characters that you set as the start and end of the range.

Also, if the first character in a range has a higher ASCII value
than the second character in the range, no range will be
constructed. Only the start, end and period characters will be
escaped. Use the ord() function to find the
ASCII value for a character.

See also stripcslashes(),
stripslashes(),
addslashes(),
htmlspecialchars(), and
quotemeta().