Online PHP editor | perf for ZY0MT

@ 2015-04-24T03:03:31Z

<?php
final function doCharDiff($from_text, $to_text)
	{
		$result = [];
		$jobs = [[0, strlen($from_text), 0, strlen($to_text)]];
		while ($job = array_pop($jobs))
		{
			// get the segments which must be diff'ed
			list($from_segment_start, $from_segment_end, $to_segment_start, $to_segment_end) = $job;
			$from_segment_len = $from_segment_end - $from_segment_start;
			$to_segment_len = $to_segment_end - $to_segment_start;

			// catch easy cases first
			if (!$from_segment_len || !$to_segment_len)
			{
				if ($from_segment_len)
					$result[$from_segment_start * 4 + 0] = new FineDiffDeleteOp($from_segment_len);
				else if ($to_segment_len)
					$result[$from_segment_start * 4 + 1] = new FineDiffInsertOp(substr($to_text, $to_segment_start, $to_segment_len));

				continue;
			}
			
			if ($from_segment_len >= $to_segment_len)
			{
				$copy_len = $to_segment_len;
				while ($copy_len)
				{
					$to_copy_start = $to_segment_start;
					$to_copy_start_max = $to_segment_end - $copy_len;
					while ($to_copy_start <= $to_copy_start_max)
					{
						$from_copy_start = strpos(substr($from_text, $from_segment_start, $from_segment_len), substr($to_text, $to_copy_start, $copy_len));
						if ($from_copy_start !== false)
						{
							$from_copy_start += $from_segment_start;
							break 2;
						}
						$to_copy_start++;
					}
					$copy_len--;
				}
			}
			else
			{
				$copy_len = $from_segment_len;
				while ($copy_len)
				{
					$from_copy_start = $from_segment_start;
					$from_copy_start_max = $from_segment_end - $copy_len;
					while ($from_copy_start <= $from_copy_start_max)
					{
						$to_copy_start = strpos(substr($to_text, $to_segment_start, $to_segment_len), substr($from_text, $from_copy_start, $copy_len));
						if ($to_copy_start !== false)
						{
							$to_copy_start += $to_segment_start;
							break 2;
						}
						$from_copy_start++;
					}
					$copy_len--;
				}
			}
			// match found
			if ($copy_len)
			{
				$jobs[] = [$from_segment_start, $from_copy_start, $to_segment_start, $to_copy_start];
				$result[$from_copy_start * 4 + 2] = new FineDiffCopyOp($copy_len);
				$jobs[] = [$from_copy_start + $copy_len, $from_segment_end, $to_copy_start + $copy_len, $to_segment_end];
			}
			// no match,  so delete all, insert all
			else
			{
				$result[$from_segment_start * 4] = new FineDiffReplaceOp($from_segment_len, substr($to_text, $to_segment_start, $to_segment_len));
			}
		}
		ksort($result, SORT_NUMERIC);
		return array_values($result);
	}

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)
5.6.8	0.010	0.060	20.53
5.5.24	0.007	0.070	20.15
5.4.40	0.033	0.050	18.75
5.4.39	0.023	0.063	18.84
5.4.38	0.017	0.057	18.51
5.4.37	0.027	0.050	18.63
5.4.36	0.023	0.050	18.79
5.4.35	0.030	0.057	18.79
5.4.34	0.017	0.057	18.46
5.4.32	0.037	0.063	18.52
5.4.31	0.033	0.050	18.80
5.4.30	0.030	0.063	18.85
5.4.29	0.020	0.063	18.52
5.4.28	0.017	0.063	18.46
5.4.27	0.027	0.053	18.63
5.4.26	0.020	0.057	18.79
5.4.25	0.020	0.063	18.55
5.4.24	0.017	0.060	18.72
5.4.23	0.033	0.053	18.56
5.4.22	0.023	0.057	18.73
5.4.21	0.063	0.067	18.71
5.4.20	0.090	0.047	16.78
5.4.19	0.033	0.053	18.79
5.4.18	0.023	0.060	18.49
5.4.17	0.070	0.073	18.68
5.4.16	0.050	0.043	18.59
5.4.15	0.033	0.060	18.76
5.4.14	0.033	0.040	16.24
5.4.13	0.030	0.043	16.25
5.4.12	0.030	0.057	16.40
5.4.11	0.033	0.053	16.21
5.4.10	0.037	0.063	16.24
5.4.9	0.037	0.047	16.45
5.4.8	0.030	0.047	16.42
5.4.7	0.027	0.053	16.29
5.4.6	0.040	0.047	16.16
5.4.5	0.040	0.050	16.26
5.4.4	0.043	0.047	16.17
5.4.3	0.047	0.047	16.34
5.4.2	0.040	0.053	16.15
5.4.1	0.037	0.070	16.29
5.4.0	0.043	0.047	15.64
5.3.29	0.043	0.063	14.60
5.3.28	0.037	0.057	14.69
5.3.27	0.033	0.060	14.61
5.3.26	0.050	0.053	14.60
5.3.25	0.027	0.060	14.68
5.3.24	0.037	0.053	14.50
5.3.23	0.043	0.057	14.57
5.3.22	0.047	0.077	14.56
5.3.21	0.040	0.070	14.48
5.3.20	0.037	0.057	14.48
5.3.19	0.050	0.053	14.56
5.3.18	0.030	0.060	14.54
5.3.17	0.037	0.053	14.57
5.3.16	0.043	0.043	14.54
5.3.15	0.030	0.057	14.56
5.3.14	0.053	0.053	14.47
5.3.13	0.053	0.063	14.46
5.3.12	0.030	0.053	14.56
5.3.11	0.033	0.047	14.44
5.3.10	0.047	0.050	14.04
5.3.9	0.037	0.060	14.12
5.3.8	0.033	0.060	14.11
5.3.7	0.040	0.060	13.91
5.3.6	0.043	0.063	13.91
5.3.5	0.043	0.053	13.88
5.3.4	0.040	0.043	13.91
5.3.3	0.053	0.060	13.82
5.3.2	0.047	0.053	13.59
5.3.1	0.040	0.043	13.76
5.3.0	0.050	0.040	13.73
5.2.17	0.023	0.040	11.10
5.2.16	0.030	0.043	11.18
5.2.15	0.030	0.043	11.28
5.2.14	0.030	0.063	11.11
5.2.13	0.040	0.053	11.08
5.2.12	0.043	0.050	11.07
5.2.11	0.027	0.057	11.07
5.2.10	0.030	0.043	11.11
5.2.9	0.027	0.053	11.09
5.2.8	0.020	0.060	11.13
5.2.7	0.017	0.043	11.05
5.2.6	0.023	0.043	11.09
5.2.5	0.017	0.047	10.98
5.2.4	0.030	0.037	10.91
5.2.3	0.017	0.043	10.94
5.2.2	0.010	0.043	10.94
5.2.1	0.027	0.047	10.92
5.2.0	0.030	0.057	10.76
5.1.6	0.027	0.040	10.11
5.1.5	0.020	0.040	9.95
5.1.4	0.010	0.040	10.11
5.1.3	0.017	0.040	10.30
5.1.2	0.027	0.033	10.49
5.1.1	0.020	0.033	10.05
5.1.0	0.023	0.027	10.14
5.0.5	0.013	0.027	8.64
5.0.4	0.017	0.023	8.53
5.0.3	0.007	0.047	8.32
5.0.2	0.007	0.030	8.39
5.0.1	0.010	0.027	8.17
5.0.0	0.017	0.037	8.24
4.4.9	0.017	0.017	5.92
4.4.8	0.003	0.027	5.81
4.4.7	0.007	0.023	5.82
4.4.6	0.007	0.030	5.85
4.4.5	0.010	0.030	5.87
4.4.4	0.010	0.037	5.88
4.4.3	0.007	0.023	5.89
4.4.2	0.000	0.027	5.95
4.4.1	0.007	0.027	5.96
4.4.0	0.007	0.043	5.92
4.3.11	0.007	0.027	5.85
4.3.10	0.000	0.027	5.80
4.3.9	0.007	0.020	5.86
4.3.8	0.013	0.037	5.81
4.3.7	0.007	0.023	5.82
4.3.6	0.007	0.023	5.79
4.3.5	0.003	0.027	5.78
4.3.4	0.010	0.030	5.79
4.3.3	0.010	0.023	4.59
4.3.2	0.007	0.020	4.55
4.3.1	0.003	0.023	4.59
4.3.0	0.003	0.027	7.32

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