Online PHP editor | perf for WuPSt

@ 2018-04-16T12:10:15Z

<?php

// Define a test HTML document containing two tables. Note that the first table
// has a row that combined <th> and <td> cells, while the second one only has
// <th> cells.
$xhtml = <<<XHTML
<html>
  <head>
    <title>Table test page</title>
  </head>
  <body>
    <table>
      <tr>
        <th>Cell 1</th>
        <td>Cell 2</td>
      </tr>
    </table>
    <table>
      <tr>
        <th>Cell 1</th>
        <th>Cell 2</th>
      </tr>
    </table>
  </body>
</html>
XHTML;

$document = new DOMDocument();
$document->loadXML($xhtml);
$xpath = new DOMXPath($document);

$xpath = function ($query) use ($xpath) {
  echo $query . "\n";
  $result = $xpath->query($query);
  if (method_exists($result, 'count')) {
    $count = $result->count();
  } else {
    // Fallback for older PHP versions that don't have DomNodeList::count().
    $result_array = iterator_to_array($result);
    // Filter out any bogus results that equal `NULL`.
    $result_array = array_filter($result_array);
    $count = count($result_array);
  }
  echo $count . ' result' . ($count != 1 ? 's' : '') . ($count ? ':' : '') . "\n";
  foreach ($result as $element) {
    $document = new DOMDocument();
    $document->appendChild($document->importNode($element->cloneNode(TRUE), TRUE));
    echo $document->saveHTML();
  }
  echo "\n";
};

echo "I am using the following XPath expression to select table cells from\n";
echo "the first row of the first table, by combining the results for <th>\n";
echo "and <td>. This works fine, I get both cells back.\n";
echo "Note that the first table combines <th> and <td> in a single row.\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/th)');

echo "When I try to get the first cell by appending [1] to the expression\n";
echo "I get the second cell back instead of the first. Why?\n";
echo "The expected result of this expression is '<th>Cell 1</th>'\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/th)[1]');

echo "Appending [2] yields the second cell successfully. But why not the first?\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[1]//tr)[1]/th)[2]');

echo "Similarly, for the second table I can get all cells with this expression.\n";
echo "The second table only contains <th> cells in the first row.\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/th)');

echo "However, when I append [1] to get only the first cell back, I get an empty result.\n";
echo "The expected result for this expression is '<th>Cell 1</th>'\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/th)[1]');

echo "The second cell can be retrieved successfully by appending [2].\n";
echo "But why not the first?\n";
$xpath('(((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/td|((descendant-or-self::html/descendant-or-self::table)[2]//tr)[1]/th)[2]');

echo "Note that by replacing the first 'descendant-or-self' with '//' the expression\n";
echo "seems to work as expected in all cases for both the first and second table:\n";
$xpath('(((//html/descendant-or-self::table)[1]//tr)[1]/td|((//html/descendant-or-self::table)[1]//tr)[1]/th)');
$xpath('(((//html/descendant-or-self::table)[1]//tr)[1]/td|((//html/descendant-or-self::table)[1]//tr)[1]/th)[1]');
$xpath('(((//html/descendant-or-self::table)[1]//tr)[1]/td|((//html/descendant-or-self::table)[1]//tr)[1]/th)[2]');
$xpath('(((//html/descendant-or-self::table)[2]//tr)[1]/td|((//html/descendant-or-self::table)[2]//tr)[1]/th)');
$xpath('(((//html/descendant-or-self::table)[2]//tr)[1]/td|((//html/descendant-or-self::table)[2]//tr)[1]/th)[1]');
$xpath('(((//html/descendant-or-self::table)[2]//tr)[1]/td|((//html/descendant-or-self::table)[2]//tr)[1]/th)[2]');

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)
8.4.13	0.006	0.004	18.21
8.4.12	0.012	0.009	20.63
8.4.11	0.006	0.004	22.95
8.4.10	0.006	0.005	18.07
8.4.9	0.013	0.010	21.12
8.4.8	0.008	0.011	19.34
8.4.7	0.014	0.007	19.22
8.4.6	0.006	0.003	21.18
8.4.5	0.005	0.007	18.88
8.4.4	0.013	0.003	19.62
8.4.3	0.010	0.007	18.17
8.4.2	0.014	0.007	19.74
8.4.1	0.017	0.003	18.82
8.3.26	0.010	0.011	16.77
8.3.25	0.011	0.008	19.36
8.3.24	0.008	0.014	17.04
8.3.23	0.011	0.009	16.97
8.3.22	0.004	0.004	19.50
8.3.21	0.007	0.007	17.02
8.3.20	0.010	0.010	17.19
8.3.19	0.012	0.008	17.66
8.3.18	0.010	0.009	18.45
8.3.17	0.015	0.003	17.69
8.3.16	0.010	0.010	18.74
8.3.15	0.016	0.003	17.54
8.3.14	0.006	0.003	17.63
8.3.13	0.006	0.003	18.77
8.3.12	0.003	0.006	21.02
8.3.11	0.013	0.007	20.94
8.3.10	0.003	0.007	24.06
8.3.9	0.005	0.003	26.77
8.3.8	0.006	0.006	18.68
8.3.7	0.011	0.011	18.52
8.3.6	0.013	0.006	18.93
8.3.5	0.009	0.005	18.63
8.3.4	0.008	0.008	19.35
8.3.3	0.009	0.006	19.14
8.3.2	0.003	0.005	22.33
8.3.1	0.004	0.004	22.32
8.3.0	0.004	0.004	20.06
8.2.29	0.012	0.008	20.81
8.2.28	0.011	0.009	18.57
8.2.27	0.010	0.010	17.58
8.2.26	0.011	0.000	16.88
8.2.25	0.015	0.004	18.81
8.2.24	0.010	0.007	19.46
8.2.23	0.004	0.011	22.58
8.2.22	0.003	0.007	37.54
8.2.21	0.000	0.015	26.77
8.2.20	0.003	0.007	16.88
8.2.19	0.013	0.003	16.88
8.2.18	0.000	0.015	18.89
8.2.17	0.004	0.015	22.96
8.2.16	0.009	0.006	20.95
8.2.15	0.006	0.003	25.66
8.2.14	0.008	0.000	24.66
8.2.13	0.008	0.000	19.82
8.2.12	0.004	0.004	26.35
8.2.11	0.010	0.000	20.67
8.2.10	0.006	0.006	18.16
8.2.9	0.003	0.006	18.25
8.2.8	0.004	0.004	19.28
8.2.7	0.000	0.008	18.18
8.2.6	0.003	0.006	18.30
8.2.5	0.003	0.005	18.47
8.2.4	0.003	0.006	20.92
8.2.3	0.000	0.008	19.75
8.2.2	0.004	0.004	18.43
8.2.1	0.000	0.010	18.50
8.2.0	0.008	0.000	18.51
8.1.33	0.006	0.014	22.21
8.1.32	0.010	0.012	16.50
8.1.31	0.005	0.003	18.77
8.1.30	0.003	0.007	18.17
8.1.29	0.006	0.003	30.84
8.1.28	0.012	0.009	25.92
8.1.27	0.004	0.004	23.99
8.1.26	0.000	0.008	26.35
8.1.25	0.000	0.010	28.09
8.1.24	0.004	0.008	24.16
8.1.23	0.012	0.000	21.47
8.1.22	0.004	0.004	18.04
8.1.21	0.003	0.006	18.77
8.1.20	0.003	0.005	17.73
8.1.19	0.000	0.008	17.60
8.1.18	0.004	0.004	18.10
8.1.17	0.003	0.006	19.04
8.1.16	0.004	0.004	19.28
8.1.15	0.000	0.007	19.41
8.1.14	0.003	0.006	18.13
8.1.13	0.000	0.007	19.40
8.1.12	0.000	0.007	17.79
8.1.11	0.000	0.009	17.75
8.1.10	0.003	0.005	17.82
8.1.9	0.005	0.005	17.94
8.1.8	0.000	0.008	17.77
8.1.7	0.004	0.004	17.80
8.1.6	0.006	0.003	18.02
8.1.5	0.006	0.006	17.79
8.1.4	0.003	0.006	17.93
8.1.3	0.006	0.005	18.09
8.1.2	0.003	0.006	18.00
8.1.1	0.004	0.007	17.84
8.1.0	0.004	0.004	17.95
8.0.30	0.005	0.003	18.77
8.0.29	0.000	0.008	17.25
8.0.28	0.000	0.007	18.82
8.0.27	0.000	0.007	17.60
8.0.26	0.005	0.002	17.71
8.0.25	0.000	0.007	17.32
8.0.24	0.002	0.005	17.34
8.0.23	0.007	0.000	17.47
8.0.22	0.004	0.004	17.42
8.0.21	0.004	0.004	17.31
8.0.20	0.008	0.000	17.28
8.0.19	0.000	0.008	17.38
8.0.18	0.000	0.008	17.29
8.0.17	0.004	0.007	17.29
8.0.16	0.002	0.005	17.38
8.0.15	0.000	0.007	17.19
8.0.14	0.004	0.004	17.36
8.0.13	0.000	0.007	13.78
8.0.12	0.003	0.006	17.29
8.0.11	0.005	0.003	17.27
8.0.10	0.004	0.004	17.40
8.0.9	0.003	0.006	17.27
8.0.8	0.003	0.020	17.42
8.0.7	0.003	0.005	17.28
8.0.6	0.004	0.004	17.29
8.0.5	0.003	0.005	17.30
8.0.3	0.010	0.009	17.50
8.0.2	0.012	0.009	17.46
8.0.1	0.004	0.004	17.54
8.0.0	0.013	0.010	17.23
7.4.33	0.000	0.005	15.55
7.4.32	0.000	0.007	16.96
7.4.30	0.000	0.007	16.84
7.4.29	0.003	0.006	16.91
7.4.28	0.000	0.008	16.83
7.4.27	0.005	0.003	16.84
7.4.26	0.003	0.003	16.77
7.4.25	0.006	0.003	16.97
7.4.24	0.008	0.000	16.85
7.4.23	0.005	0.002	17.01
7.4.22	0.003	0.005	17.01
7.4.21	0.012	0.006	17.09
7.4.20	0.005	0.002	17.00
7.4.16	0.010	0.008	16.94
7.4.14	0.012	0.010	17.86
7.4.13	0.013	0.006	16.89
7.4.12	0.011	0.010	16.96
7.4.11	0.016	0.003	16.89
7.4.10	0.013	0.004	16.88
7.4.9	0.010	0.016	16.77
7.4.8	0.009	0.012	19.39
7.4.7	0.015	0.004	16.95
7.4.6	0.013	0.004	16.75
7.4.5	0.004	0.011	16.93
7.4.4	0.011	0.008	17.06
7.4.0	0.012	0.003	15.16
7.3.33	0.003	0.003	13.49
7.3.32	0.000	0.007	13.72
7.3.31	0.007	0.000	16.78
7.3.30	0.003	0.003	16.77
7.3.29	0.008	0.000	16.66
7.3.28	0.011	0.004	16.81
7.3.26	0.009	0.009	16.77
7.3.24	0.012	0.008	16.96
7.3.23	0.009	0.011	16.75
7.3.21	0.009	0.009	16.81
7.3.20	0.003	0.014	17.06
7.3.19	0.008	0.010	16.96
7.3.18	0.007	0.011	16.95
7.3.17	0.013	0.005	16.64
7.3.16	0.010	0.007	16.99
7.3.1	0.010	0.007	16.88
7.3.0	0.000	0.014	16.69
7.2.33	0.012	0.008	16.99
7.2.32	0.006	0.012	16.88
7.2.31	0.010	0.010	16.96
7.2.30	0.013	0.010	17.02
7.2.29	0.003	0.017	17.18
7.2.13	0.006	0.010	17.13
7.2.12	0.006	0.009	17.25
7.2.11	0.009	0.006	17.08
7.2.10	0.000	0.012	17.22
7.2.9	0.006	0.009	17.29
7.2.8	0.006	0.009	17.39
7.2.7	0.009	0.003	16.97
7.2.6	0.007	0.007	16.99
7.2.5	0.010	0.003	17.12
7.2.4	0.045	0.014	17.81
7.2.3	0.048	0.008	17.57
7.2.2	0.007	0.014	17.81
7.2.1	0.051	0.006	17.72
7.2.0	0.012	0.010	17.38
7.1.25	0.004	0.011	15.88
7.1.20	0.000	0.010	15.91
7.1.16	0.074	0.015	16.84
7.1.15	0.009	0.014	17.08
7.1.14	0.079	0.014	17.18
7.1.13	0.075	0.013	17.21
7.1.12	0.054	0.013	17.06
7.1.11	0.070	0.012	16.39
7.1.10	0.106	0.012	16.51
7.1.9	0.100	0.012	16.45
7.1.8	0.079	0.011	16.54
7.1.7	0.115	0.015	15.38
7.1.6	0.112	0.018	33.38
7.1.5	0.134	0.009	33.28
7.1.4	0.154	0.022	32.79
7.1.3	0.157	0.020	32.75
7.1.2	0.119	0.019	32.94
7.1.1	0.093	0.019	15.07
7.1.0	0.064	0.017	15.13

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