[PHP 4, PHP 5, PHP 7, PHP 8]
base64_decode — Decodes data encoded with MIME base64
Description
base64_decode[string $string, bool $strict = false]: string|false
Parameters
stringThe encoded data.
strict If the strict parameter
is set to true then the base64_decode[] function will return false if the input contains character from outside the base64 alphabet. Otherwise invalid characters will be silently discarded.
Return Values
Returns the decoded data or false on failure. The returned data may be binary.
Examples
Example #1 base64_decode[] example
The above example will output:
This is an encoded string
winkelnkemper at googlemail dot com ¶
11 years ago
If you want to save data that is derived from a Javascript canvas.toDataURL[] function, you have to convert blanks into plusses. If you do not do that, the decoded data is corrupted:
walf ¶
6 years ago
Base64 for URL parameters/filenames, that adhere to RFC 4648.
Defaults to dropping the padding on encode since it's not required for decoding, and keeps the URL free of % encodings.
for big $encoded strings, it's saver to use
where 256 can be replaced by a sufficiently small modulo 4 natural.
Tom ¶
15 years ago
This function supports "base64url" as described in Section 5 of RFC 4648, "Base 64 Encoding with URL and Filename Safe Alphabet"
Starson ¶
15 years ago
To expand on Jes' post:
The change took place between 5.0.5 and 5.1.0. Exactly where I don't know or care.
In short php
This is the PHP equivalent to perl's unpack["u",___]. That is, you need to strip the 'begin' and 'end' lines from the typical uuencoded file.
Klaus Fehrenbacher ¶
19 years ago
this script can correct the bug
dimagolov at yahoo dot com ¶
13 years ago
Here is function to decode Base 62 [see //en.wikipedia.org/wiki/Base_62] string to number. It is used by MTA in message id, e.g. by Exim
zmorris at zsculpt dot com ¶
14 years ago
Here is a drop-in replacement for base64_decode[], based on a faster version of morgangalpin's code:
alvaro at demogracia dot com ¶
13 years ago
You can do partial decoding [e.g. from buffered input streams] if you choose a chunk length that is multiple of 4:
4 encoded chars represent 3 original chars. The "=" character is used as padding.
markandrewslade at gmail dot com ¶
6 years ago
The docs don't make this explicitly clear, but if you omit `$strict` or set it to `false` then invalid characters in the encoded input will be silently ignored.