Online PHP editor | perf for GK1hi

@ 2021-07-21T04:24:10Z

<?php

/*
This function DOES NOT validate the $bbcode string to contain a balanced number of opening & closing tags.
This funcion DOES check that there are enough closing tags to conclude a targeted opening tag.
*/
function omit_user_quotes($bbcode, $user) {
    $substrings = preg_split('~(\[/?quote[^]]*\])~', $bbcode, 0, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
    $opens = 0;  // necessary declaration to avoid Notice when no quote tags in $bbcode string
    foreach ($substrings as $index => $substring) {
        if (!isset($start) && $substring == "[quote={$user}]") {  // found targeted user's first opening quote
            $start = $index;  // disqualify the first if statement and start searching for end tag
            $opens = 1;  // $opens counts how many end tags are required to conclude quote block
        } elseif (isset($start)) {
            if (strpos($substring, '[quote=') !== false) {  // if a nested opening quote tag is found
                ++$opens;  // increment and continue looking for closing quote tags
            } elseif (strpos($substring, '[/quote]') !== false) {  // if a closing quote tag is found
                --$opens;  // decrement and check for quote tag conclusion or error
                if (!$opens) {  // if $opens is zero ($opens can never be less than zero)
                    $substrings = array_diff_key($substrings, array_flip(range($start, $index)));  // slice away unwanted elements from input array
                    unset($start);  // re-qualify the first if statement to allow the process to repeat
                }
            }
        }
    }
    if ($opens) {  // if $opens is positive
        return 'Error due to opening/closing tag imbalance (too few end tags)';
    } else {
        return trim(implode($substrings));  // trims the whitespaces on either side of $bbcode string as feature
    }    
}

/* Single unwanted quote with nested innocent quote: */
/*$bbcode='[quote=testuser]
[quote=anotheruser]a sdasdsa dfv rdfgrgre gzdf vrdg[/quote]
sdfsd fdsf dsf sdf[/quote]
the rest of the test'; */
/* output: the rest of the test */

/* Complex battery of unwanted, wanted, and nested quotes: */
$bbcode = '[quote=mickmackusa]Keep this[/quote]
[quote=testuser]Don\'t keep this because 
    [quote=mickmackusa]said don\'t do it[/quote]
    ... like that\'s a good reason
    [quote=NaughtySquid] It\'s tricky business, no?[/quote]
    [quote=nester][quote=nesty][quote=nested][/quote][/quote][/quote]
[/quote]
Let\'s remove a second set of quotes
[quote=testuser]Another quote block[/quote]
[quote=mickmackusa]Let\'s do a third quote inside of my quote...
[quote=testuser]Another quote block[/quote]
[/quote]
This should be good, but
What if [quote=testuser]quotes himself [quote=testuser] inside of his own[/quote] quote[/quote]?';

/* No quotes: */
//$bbcode='This has no bbcode quote tags in it.';
/* output: This has no bbcode quote tags in it. */

/* Too few end quote tags by innocent user:
(No flag is raised because the targeted user has not quoted any text) */
//$bbcode='This [quote=mickmackusa] has not end tag.';
/* output: This [quote=mickmackusa] has not end tag. */

/* Too few end quote tags by unwanted user: */
//$bbcode='This [quote=testuser] has not end tag.';
/* output: Error due to opening/closing tag imbalance (too few end tags) */

/* Too many end quote tags by unwanted user: 
(No flag is raised because the function does not validate the bbcode text as fully balanced) */
//$bbcode='This [quote=testuser] has too many end[/quote] tags.[/quote]';
/* output: This  tags.[/quote] */

$user = 'testuser';

echo omit_user_quotes($bbcode, $user);  // omit a single user's quote blocks

/* Or if you want to omit quote blocks from multiple users, you can use a loop:
$users = ['mickmackusa', 'NaughtySquid'];
foreach ($users as $user) {
    $bbcode = omit_user_quotes($bbcode, $user);
}
echo $bbcode;
*/

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)
8.3.8	0.003	0.007	19.36
8.3.7	0.004	0.014	16.75
8.3.6	0.014	0.000	18.55
8.3.5	0.009	0.006	16.50
8.3.4	0.010	0.007	18.92
8.3.3	0.015	0.006	18.98
8.3.2	0.004	0.004	24.18
8.3.1	0.005	0.003	24.66
8.3.0	0.008	0.000	26.16
8.2.20	0.009	0.000	18.88
8.2.19	0.006	0.012	16.63
8.2.18	0.008	0.006	25.92
8.2.17	0.017	0.000	18.94
8.2.16	0.007	0.007	22.96
8.2.15	0.005	0.002	25.66
8.2.14	0.004	0.004	24.66
8.2.13	0.008	0.000	26.16
8.2.12	0.004	0.004	19.63
8.2.11	0.007	0.003	22.20
8.2.10	0.008	0.003	17.84
8.2.9	0.004	0.004	19.34
8.2.8	0.004	0.004	18.95
8.2.7	0.000	0.008	17.75
8.2.6	0.005	0.003	17.93
8.2.5	0.004	0.004	18.07
8.2.4	0.000	0.008	20.07
8.2.3	0.008	0.000	18.02
8.2.2	0.000	0.007	18.17
8.2.1	0.007	0.000	19.36
8.2.0	0.000	0.008	19.31
8.1.29	0.003	0.006	30.84
8.1.28	0.009	0.006	25.92
8.1.27	0.008	0.000	23.99
8.1.26	0.006	0.003	26.35
8.1.25	0.003	0.005	28.09
8.1.24	0.007	0.003	20.39
8.1.23	0.007	0.003	17.77
8.1.22	0.003	0.006	17.74
8.1.21	0.005	0.003	18.77
8.1.20	0.003	0.006	17.35
8.1.19	0.003	0.005	17.48
8.1.18	0.003	0.005	18.10
8.1.17	0.005	0.003	18.87
8.1.16	0.000	0.007	18.87
8.1.15	0.000	0.007	18.92
8.1.14	0.000	0.007	18.97
8.1.13	0.008	0.000	17.60
8.1.12	0.000	0.007	17.65
8.1.11	0.004	0.004	17.53
8.1.10	0.007	0.004	17.59
8.1.9	0.000	0.007	17.56
8.1.8	0.005	0.005	17.45
8.1.7	0.010	0.000	17.63
8.1.6	0.000	0.007	17.66
8.1.5	0.008	0.000	17.69
8.1.4	0.004	0.004	17.58
8.1.3	0.005	0.003	17.65
8.1.2	0.000	0.009	17.81
8.1.1	0.003	0.006	17.72
8.1.0	0.008	0.000	17.60
8.0.30	0.004	0.004	18.77
8.0.29	0.004	0.004	16.88
8.0.28	0.000	0.007	18.36
8.0.27	0.005	0.002	18.19
8.0.26	0.003	0.003	16.98
8.0.25	0.003	0.003	17.02
8.0.24	0.003	0.003	17.12
8.0.23	0.007	0.000	17.14
8.0.22	0.004	0.004	17.02
8.0.21	0.007	0.000	16.95
8.0.20	0.007	0.000	17.15
8.0.19	0.004	0.004	17.00
8.0.18	0.004	0.007	17.13
8.0.17	0.000	0.008	17.06
8.0.16	0.003	0.006	17.02
8.0.15	0.007	0.003	17.06
8.0.14	0.000	0.007	16.91
8.0.13	0.000	0.005	13.53
8.0.12	0.000	0.008	16.99
8.0.11	0.000	0.007	17.04
8.0.10	0.004	0.004	16.94
8.0.9	0.004	0.004	16.94
8.0.8	0.011	0.007	16.97
8.0.7	0.013	0.010	17.10
8.0.6	0.019	0.006	16.88
8.0.5	0.015	0.009	16.96
8.0.3	0.016	0.008	17.07
8.0.2	0.014	0.010	17.11
8.0.1	0.014	0.010	17.07
8.0.0	0.010	0.011	17.11
7.4.33	0.005	0.000	15.55
7.4.32	0.004	0.004	16.77
7.4.30	0.003	0.003	16.80
7.4.29	0.004	0.004	16.73
7.4.28	0.013	0.000	16.59
7.4.27	0.000	0.008	16.64
7.4.26	0.003	0.003	13.54
7.4.25	0.000	0.007	16.75
7.4.24	0.005	0.002	16.85
7.4.23	0.003	0.003	16.65
7.4.22	0.004	0.004	16.64
7.4.21	0.014	0.010	16.77
7.4.20	0.023	0.000	16.73
7.4.19	0.019	0.009	16.83
7.4.18	0.013	0.009	16.76
7.4.16	0.021	0.012	16.71
7.4.15	0.010	0.013	16.70
7.4.14	0.016	0.008	16.73
7.4.13	0.020	0.003	16.92
7.4.12	0.013	0.010	16.77
7.4.11	0.022	0.004	16.67
7.4.10	0.022	0.003	16.90
7.4.9	0.014	0.010	16.78
7.4.8	0.016	0.008	16.69
7.4.7	0.013	0.013	16.86
7.4.6	0.019	0.007	16.84
7.4.5	0.012	0.012	16.79
7.4.4	0.004	0.019	16.64
7.4.3	0.010	0.013	16.91
7.4.2	0.010	0.017	16.66
7.4.1	0.009	0.009	16.70
7.4.0	0.013	0.005	16.72
7.3.33	0.007	0.000	16.55
7.3.32	0.000	0.005	13.57
7.3.31	0.007	0.000	16.55
7.3.30	0.000	0.008	16.43
7.3.29	0.015	0.008	16.52
7.3.28	0.010	0.007	16.54
7.3.27	0.003	0.015	16.60
7.3.26	0.013	0.003	16.52
7.3.25	0.019	0.003	16.57
7.3.24	0.003	0.019	16.57
7.3.23	0.016	0.004	16.54
7.3.22	0.012	0.008	16.52
7.3.21	0.016	0.005	16.48
7.3.20	0.016	0.004	16.46
7.3.19	0.006	0.012	16.47
7.3.18	0.007	0.017	16.51
7.3.17	0.020	0.012	16.50
7.3.16	0.018	0.014	16.48
7.3.15	0.018	0.009	16.49
7.3.14	0.021	0.004	16.57
7.3.13	0.024	0.003	16.41
7.3.12	0.015	0.009	16.48
7.3.11	0.013	0.013	16.44
7.3.10	0.020	0.012	16.44
7.3.9	0.017	0.008	16.84
7.3.8	0.012	0.012	16.55
7.3.7	0.016	0.013	16.62
7.3.6	0.039	0.006	16.76
7.3.5	0.016	0.012	16.58
7.3.4	0.015	0.015	16.65
7.3.3	0.025	0.000	16.70
7.3.2	0.022	0.006	16.73
7.3.1	0.015	0.011	16.64
7.3.0	0.023	0.004	16.63

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