Online PHP editor | perf for IkXq2

@ 2013-03-02T22:00:53Z

<?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();
echo $b->decode('d5iskrr'):

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
5.4.12	0.016	0.041	12.01
5.4.11	0.015	0.043	12.00
5.4.10	0.014	0.044	12.00
5.4.9	0.014	0.046	12.00
5.4.8	0.037	0.083	12.00
5.4.7	0.013	0.045	12.00
5.4.6	0.018	0.041	12.00
5.4.5	0.014	0.043	12.00
5.4.4	0.014	0.045	11.99
5.4.3	0.013	0.047	11.98
5.4.2	0.026	0.064	11.98
5.4.1	0.021	0.050	11.98
5.4.0	0.019	0.069	11.48
5.3.22	0.015	0.046	12.68
5.3.21	0.016	0.043	12.68
5.3.20	0.020	0.040	12.68
5.3.19	0.019	0.043	12.68
5.3.18	0.019	0.042	12.67
5.3.17	0.021	0.070	12.66
5.3.16	0.018	0.047	12.67
5.3.15	0.020	0.042	12.67
5.3.14	0.020	0.044	12.66
5.3.13	0.021	0.040	12.66
5.3.12	0.019	0.044	12.66
5.3.11	0.029	0.076	12.66
5.3.10	0.014	0.047	12.12
5.3.9	0.018	0.042	12.09
5.3.8	0.015	0.046	12.08
5.3.7	0.021	0.056	12.08
5.3.6	0.017	0.044	12.07
5.3.5	0.015	0.043	12.01
5.3.4	0.026	0.079	12.01
5.3.3	0.019	0.038	11.98
5.3.2	0.023	0.066	11.75
5.3.1	0.016	0.042	11.71
5.3.0	0.014	0.042	11.70

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