String Filters
Compression Filters
List of Available Filters
PHP Manual

## Conversion Filters

Like the string.* filters, the convert.* filters perform actions similar to their names. The convert filters were added with PHP 5.0.0. For more information on a given filter, refer to the manual page for the corresponding function.

convert.base64-encode and convert.base64-decode Use of these filters are equivalent to processing all stream data through the base64_encode and base64_decode functions respectively. convert.base64-encode supports parameters given as an associative array. If `line-length` is given, the base64 output will be split into chunks of `line-length` characters each. If `line-break-chars` is given, each chunk will be delimited by the characters given. These parameters give the same effect as using base64_encode with chunk_split.

Example #1 convert.base64-encode & convert.base64-decode

`<?php
$fp = fopen('php://output', 'w');
stream_filter_append($fp, 'convert.base64-encode');
fwrite($fp, "This is a test.\n");
fclose($fp);
/* Outputs: VGhpcyBpcyBhIHRlc3QuCg== */
$param = array('line-length' => 8, 'line-break-chars' => "\r\n");
$fp = fopen('php://output', 'w');
stream_filter_append($fp, 'convert.base64-encode', STREAM_FILTER_WRITE, $param);
fwrite($fp, "This is a test.\n");
fclose($fp);
/* Outputs: VGhpcyBp
: cyBhIHRl
: c3QuCg== */
$fp = fopen('php://output', 'w');
stream_filter_append($fp, 'convert.base64-decode');
fwrite($fp, "VGhpcyBpcyBhIHRlc3QuCg==");
fclose($fp);
/* Outputs: This is a test. */
?>`

convert.quoted-printable-encode and convert.quoted-printable-decode Use of the decode version of this filter is equivalent to processing all stream data through the quoted_printable_decode functions. There is no function equivalent to convert.quoted-printable-encode. convert.quoted-printable-encode supports parameters given as an associative array. In addition to the parameters supported by convert.base64-encode, convert.quoted-printable-encode also supports boolean arguments `binary` and `force-encode-first`. convert.base64-decode only supports the `line-break-chars` parameter as a type-hint for striping from the encoded payload.

Example #2 convert.quoted-printable-encode & convert.quoted-printable-decode

`<?php
$fp = fopen('php://output', 'w');
stream_filter_append($fp, 'convert.quoted-printable-encode');
fwrite($fp, "This is a test.\n");
/* Outputs: =This is a test.=0A */
?>`