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<?php
namespace Amp\Serialization;
/**
* @param string $data Binary data.
*
* @return string Unprintable characters encoded as \x##.
*/
function encodeUnprintableChars(string $data): string
{
return \preg_replace_callback("/[^\x20-\x7e]/", function (array $matches): string {
return "\\x" . \dechex(\ord($matches[0]));
}, $data);
}