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 K-5. convert.base64-encode & convert.base64-decode
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.
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