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                                  addcslashes

   (PHP 4 )
   addcslashes -- Quote string with slashes in a C style

Description

   string addcslashes ( string str, string charlist)

   Returns a string with backslashes before characters that are listed in
   charlist parameter. It escapes \n, \r etc. in C-like style, characters
   with ASCII code lower than 32 and higher than 126 are 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 37.

   Example 1. addcslashes() example
   <?php
   $escaped = addcslashes($not_escaped, "\0..\37!@\177..\377");
   ?>

   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.

   <?php
   echo addcslashes('foo[ ]', 'A..z');
   // output:  \f\o\o\[ \]
   // All upper and lower-case letters will be escaped
   // ... but so will the [\]^_` and any tabs, line
   // feeds, carriage returns, etc.
   ?>

   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.

   <?php
   echo addcslashes("zoo['.']", 'z..A');
   // output:  \zoo['\.']
   ?>

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