(PHP 4, PHP 5)
addcslashes — Quote string with slashes in a C style
$str
, string $charlist
)
Returns a string with backslashes before characters that are
listed in charlist parameter.
str
The string to be escaped.
charlist
A list of characters to be escaped. 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.
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 [\]^_`
?>
<?php
echo addcslashes("zoo['.']", 'z..A');
// output: \zoo['\.']
?>
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), \f (form feed), \v (vertical tab) and \t (tab) are predefined escape sequences, while in C all of these are predefined escape sequences.
Returns the escaped string.
| Version | Description |
|---|---|
| 5.2.5 | The escape sequences \v and \f were added. |
charlist like "\0..\37", which would
escape all characters with ASCII code between 0 and 31.
Example #1 addcslashes() example
<?php
$escaped = addcslashes($not_escaped, "\0..\37!@\177..\377");
?>