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@ 2013-03-02T21:57:05Z

<?php

class Bijective {
  
    /**
     *
     * @var string
     */
    private $dictionary = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  
    /**
     * CTOR 
     */
    public function __construct() {
        $this->dictionary = str_split($this->dictionary);
    }
  
    /**
     *
     * @param int $i
     * @return string
     */
    public function encode($i) {
        if ($i == 0)
            return $this->dictionary[0];
  
        $result = '';
        $base = count($this->dictionary);
  
        while ($i > 0) {
            $result[] = $this->dictionary[($i % $base)];
            $i = floor($i / $base);
        }
  
        $result = array_reverse($result);
  
        return join("", $result);
    }
  
    /**
     *
     * @param string $input
     * @return int
     */
    public function decode($input) {
        $i = 0;
        $base = count($this->dictionary);
  
        $input = str_split($input);
  
        foreach ($input as $char) {
            $pos = array_search($char, $this->dictionary);
  
            $i = $i * $base + $pos;
        }
  
        return $i;
    }
  
}

$b=new Bijective();

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CoU3G on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/CoU3G on line 9
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/CoU3G on line 9
Process exited with code 255.

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