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<?php |
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|
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/* |
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* This file is part of the Symfony package. |
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* |
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* (c) Fabien Potencier <fabien@symfony.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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|
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namespace Symfony\Component\Mime\Encoder; |
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|
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/** |
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* @author Chris Corbyn |
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*/ |
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class Base64Encoder implements EncoderInterface |
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{ |
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/** |
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* Takes an unencoded string and produces a Base64 encoded string from it. |
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* |
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* Base64 encoded strings have a maximum line length of 76 characters. |
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* If the first line needs to be shorter, indicate the difference with |
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* $firstLineOffset. |
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*/ |
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public function encodeString(string $string, ?string $charset = 'utf-8', int $firstLineOffset = 0, int $maxLineLength = 0): string |
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{ |
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if (0 >= $maxLineLength || 76 < $maxLineLength) { |
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$maxLineLength = 76; |
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} |
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|
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$encodedString = base64_encode($string); |
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$firstLine = ''; |
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if (0 !== $firstLineOffset) { |
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$firstLine = substr($encodedString, 0, $maxLineLength - $firstLineOffset)."\r\n"; |
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$encodedString = substr($encodedString, $maxLineLength - $firstLineOffset); |
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} |
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|
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return $firstLine.trim(chunk_split($encodedString, $maxLineLength, "\r\n")); |
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} |
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} |
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|
