(PHP 4, PHP 5, PHP 7)
addcslashes — Quote string with slashes in a C style
$str
, string $charlist
) : string
Returns a string with backslashes before characters that are
listed in charlist parameter.
strThe 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, all of
which are predefined escape sequences in C. Many of these sequences are
also defined in other C-derived languages, including PHP, meaning that
you may not get the desired result if you use the output of
addcslashes() to generate code in those languages
with these characters defined in charlist.
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");
?>