Php file content to base64

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wuyumin/File2base64

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README.md

base64 files are used for embedding in web pages.

composer require wuyumin/file2base64

require __DIR__ . '/../vendor/autoload.php'; use File2base64\File2base64; $file2base64 = new File2base64(); # $file2base64 = new File2base64(['bmp' => 'image/bmp']); $file2base64->toFile('file2base64.png', 'file2base64.txt'); # echo $file2base64->toBase64('file2base64.png');

（tips：Laravel 5.5+ can ignore step 2、3，version 5.5+ support to register automatically）

1. Composer install composer require wuyumin/file2base64
2. (ServiceProvider)add the follow line to the section providers of config/app.php
   File2base64\Laravel\ServiceProvider::class,
3. (Facades)add the follow line to the section aliases of config/app.php (optional)
   ‘File2base64’ => File2base64\Laravel\Facade::class,

img src pl-s">data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" alt="">

You can init for other type use array.

$file2base64 = new File2base64([‘bmp’ => ‘image/bmp’]);

Источник

base64_encode

Эта кодировка предназначена для корректной передачи бинарных данных по протоколам, не поддерживающим 8-битную передачу, например, для отправки тела письма.

Данные, закодированные base64 занимают на 33% больше места по сравнению с оригинальными данными.

Список параметров

Возвращаемые значения

Кодированные данные в виде строки.

Примеры

Пример #1 Пример использования base64_encode()

Результат выполнения данного примера:

0K3RgtC+INC30LDQutC+0LTQuNGA0L7QstCw0L3QvdCw0Y8g0YHRgtGA0L7QutCw

Смотрите также

• base64_decode() — Декодирует данные, закодированные MIME base64
• chunk_split() — Разбивает строку на фрагменты
• convert_uuencode() — Кодирует строку в формат uuencode
• » RFC 2045 раздел 6.8

User Contributed Notes 37 notes

For anyone interested in the ‘base64url’ variant encoding, you can use this pair of functions:

function base64url_encode ( $data ) <
return rtrim ( strtr ( base64_encode ( $data ), ‘+/’ , ‘-_’ ), ‘=’ );
>

function base64url_decode ( $data ) <
return base64_decode ( str_pad ( strtr ( $data , ‘-_’ , ‘+/’ ), strlen ( $data ) % 4 , ‘=’ , STR_PAD_RIGHT ));
>
?>

gutzmer at usa dot net’s ( http://php.net/manual/en/function.base64-encode.php#103849 ) base64url_decode() function doesn’t pad longer strings with ‘=’s. Here is a corrected version:

function base64url_encode ( $data ) return rtrim ( strtr ( base64_encode ( $data ), ‘+/’ , ‘-_’ ), ‘=’ );
>

function base64url_decode ( $data ) return base64_decode ( strtr ( $data , ‘-_’ , ‘+/’ ) . str_repeat ( ‘=’ , 3 — ( 3 + strlen ( $data )) % 4 ));
>

// proof
for( $i = 0 , $s = » ; $i < 24 ; ++ $i , $s .= substr ( " $i " , - 1 ))$base64_encoded = base64_encode ( $s );
$base64url_encoded = base64url_encode ( $s );
$base64url_decoded = base64url_decode ( $base64url_encoded );
$base64_restored = strtr ( $base64url_encoded , ‘-_’ , ‘+/’ )
. str_repeat ( ‘=’ ,
3 — ( 3 + strlen ( $base64url_encoded )) % 4
);
echo » $s
$base64url_decoded
$base64_encoded
$base64_restored
$base64url_encoded

» ;
>
?>

In PHP 7, the padding issue with base64_decode() is no more — the following is totally fine:

function base64_encode_url($string) return str_replace([‘+’,’/’,’=’], [‘-‘,’_’,»], base64_encode($string));
>

function base64_decode_url($string) return base64_decode(str_replace([‘-‘,’_’], [‘+’,’/’], $string));
>

Checked here with random_bytes() and random lengths:

Base64 encoding of large files.

Base64 encoding converts triples of eight-bit symbols into quadruples of six-bit symbols. Reading the input file in chunks that are a multiple of three bytes in length results in a chunk that can be encoded independently of the rest of the input file. MIME additionally enforces a line length of 76 characters plus the CRLF. 76 characters is enough for 19 quadruples of six-bit symbols thus representing 19 triples of eight-bit symbols. Reading 57 eight-bit symbols provides exactly enough data for a complete MIME-formatted line. Finally, PHP’s default buffer size is 8192 bytes — enough for 143 MIME lines’ worth of input.

So if you read from the input file in chunks of 8151 (=57*143) bytes you will get (up to) 8151 eight-bit symbols, which encode as exactly 10868 six-bit symbols, which then wrap to exactly 143 MIME-formatted lines. There is no need to retain left-over symbols (either six- or eight-bit) from one chunk to the next. Just read a chunk, encode it, write it out, and go on to the next chunk. Obviously the last chunk will probably be shorter, but encoding it is still independent of the rest.

while(! feof ( $input_file ))
$plain = fread ( $input_file , 57 * 143 );
$encoded = base64_encode ( $plain );
$encoded = chunk_split ( $encoded , 76 , «\r\n» );
fwrite ( $output_file , $encoded );
>

?>

Conversely, each 76-character MIME-formatted line (not counting the trailing CRLF) contains exactly enough data for 57 bytes of output without needing to retain leftover bits that need prepending to the next line. What that means is that each line can be decoded independently of the others, and the decoded chunks can then be concatenated together or written out sequentially. However, this does make the assumption that the encoded data really is MIME-formatted; without that assurance it is necessary to accept that the base64 data won’t be so conveniently arranged.

Unfortunately my «function» for encoding base64 on-the-fly from 2007 [which has been removed from the manual in favor of this post] had 2 errors!
The first led to an endless loop because of a missing «$feof»-check, the second caused the rare mentioned errors when encoding failed for some reason in larger files, especially when
setting fgets($fh, 2) for example. But lower values then 1024 are bad overall because they slow down the whole process, so 4096 will be fine for all purposes, I guess.
The error was caused by the use of «empty()».

Here comes the corrected version which I have tested for all kind of files and length (up to 4,5 Gb!) without any error:

$fh = fopen ( ‘Input-File’ , ‘rb’ );
//$fh2 = fopen(‘Output-File’, ‘wb’);

if (! $eof ) <
if (! feof ( $fh )) <
$row = fgets ( $fh , 4096 );
> else <
$row = » ;
$eof = true ;
>
>

if ( $cache !== » )
$row = $cache . $row ;
elseif ( $eof )
break;

$b64 = base64_encode ( $row );
$put = » ;

if ( strlen ( $b64 ) < 76 ) <
if ( $eof ) <
$put = $b64 . «\n» ;
$cache = » ;
> else <
$cache = $row ;
>

> elseif ( strlen ( $b64 ) > 76 ) <
do <
$put .= substr ( $b64 , 0 , 76 ). «\n» ;
$b64 = substr ( $b64 , 76 );
> while ( strlen ( $b64 ) > 76 );

$cache = base64_decode ( $b64 );

if ( $put !== » ) <
echo $put ;
//fputs($fh2, $put);
//fputs($fh2, base64_decode($put)); // for comparing
>
>

Источник

Преобразование изображения в Base64 на PHP

Преобразование файла в Base64-изображение для вставки тег или CSS background производится по следующему формату:

Для теста возьмем маленькое изображение: Для него в PHP нужно получить MIME, прочитать файл и закодировать полученные данные функцией base64_encode() . Т.к. функция getimagesize() не актуальна для SVG файлов, для них придется сделать исключение.

Результат:

Источник

Преобразование изображения в Base64 на PHP

Преобразование файла в Base64-изображение для вставки тег или CSS background производится по следующему формату:

Для теста возьмем маленькое изображение: Для него в PHP нужно получить MIME, прочитать файл и закодировать полученные данные функцией base64_encode() . Т.к. функция getimagesize() не актуальна для SVG файлов, для них придется сделать исключение.

Результат:

Источник