Online PHP editor | refs for EBWIP

<?php function b62e($str) { if(mb_check_encoding($str, 'ASCII')) { $out = ''; $len = strlen($str); for($i=0; $i<$len; $i+=8) { $chunk = substr($str, $i, 8); $outlen = ceil( strlen($chunk)*8/6 );// 8bit/char in, 6bits/char out, round up $hex = bin2hex($chunk);// gmp won't convert from binary, so go via hex $raw = gmp_strval(gmp_init(ltrim($hex, '0'), 16), 62);// gmp doesn't like leading 0s $out .= str_pad($raw, $outlen, '0', STR_PAD_LEFT); } return $out; } return false;// unicode chars not supported } function b62d($str) { if(mb_check_encoding($str, 'ASCII')) { $out = ''; $len = strlen($str); for ($i=0; $i<$len; $i+=11) { $chunk = substr($str, $i, 11); $outlen = floor( strlen($chunk)*6/8 ); //6bit/char in, 8bits/char out, round down $raw = gmp_strval(gmp_init(ltrim($chunk, '0'), 62), 16); //gmp doesn't like leading 0s $pad = str_pad($raw, $outlen * 2, '0', STR_PAD_LEFT); //double output length as as we're going via hex (4bits/char) $out .= pack('H*', $pad); //same as hex2bin } return $out; } return false;// unicode chars not supported } for($i=0; $i<999; $i++){ $encoded = b62e($i); $decoded = b62d($encoded); echo "\t".$i."\t--->\t".$encoded."\t--->\t".$decoded.PHP_EOL; }

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