Online PHP editor | perf for k8YmZ

@ 2026-08-28T23:13:12Z

<?php

echo CASE_LOWER, PHP_EOL;
echo CASE_UPPER, PHP_EOL;

$arr = ['a' => 1];

echo '===== THESE ARE VALID AND CORRECT =====', PHP_EOL;

echo '------ $case is PHP constant -------------', PHP_EOL;

var_dump(array_change_key_case($arr, CASE_LOWER));
var_dump(array_change_key_case($arr, CASE_UPPER));

echo '------ $case is integer -------------', PHP_EOL;

var_dump(array_change_key_case($arr, 0));
var_dump(array_change_key_case($arr, 1));

echo '===== THE BEHAVIOUR HERE IS UNEXPECTED, I WOULD EXPECT A TYPEERROR =====', PHP_EOL;

echo '------- $case is text string ------------', PHP_EOL;

var_dump(array_change_key_case($arr, '0'));
var_dump(array_change_key_case($arr, '1'));

echo '------ $case is float -------------', PHP_EOL;

var_dump(array_change_key_case($arr, 0.3));
var_dump(array_change_key_case($arr, 1.4));

echo '------ $case is boolean -------------', PHP_EOL;

var_dump(array_change_key_case($arr, false));
var_dump(array_change_key_case($arr, true));

echo '===== WHEN ERRORS ARE ACTUALLY THROWN =====', PHP_EOL;

echo '------ $case is invalid value -------------', PHP_EOL;

try {
    var_dump(array_change_key_case($arr, 3));
} catch(Error $e) {
    echo $e->getMessage(), PHP_EOL;
}

echo '------ $case is invalid value and invalid type -------------', PHP_EOL;

try {
    var_dump(array_change_key_case($arr, 'text'));
} catch(Error $e) {
    echo $e->getMessage(), PHP_EOL;
}

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)
8.5.10	0.011	0.007	17.24
8.5.9	0.011	0.009	17.24
8.5.8	0.011	0.007	17.24
8.5.7	0.010	0.008	17.24
8.5.6	0.009	0.010	17.24
8.5.5	0.011	0.008	17.24
8.5.4	0.011	0.006	17.24
8.5.3	0.009	0.009	17.24
8.5.2	0.009	0.009	17.24
8.5.1	0.015	0.003	17.24
8.5.0	0.012	0.006	17.24
8.4.25	0.013	0.009	19.73
8.4.24	0.012	0.010	19.77
8.4.23	0.012	0.009	19.79
8.4.22	0.013	0.009	19.86
8.4.21	0.013	0.009	19.66
8.4.20	0.012	0.010	19.66
8.4.19	0.012	0.009	19.82
8.4.18	0.013	0.005	19.84
8.4.17	0.014	0.008	19.84
8.4.16	0.009	0.011	19.77
8.4.15	0.012	0.002	19.80
8.4.14	0.010	0.009	17.95
8.4.13	0.014	0.006	17.97
8.4.12	0.014	0.006	18.17
8.4.11	0.007	0.009	17.97
8.4.10	0.009	0.005	18.16
8.4.9	0.005	0.003	18.10
8.4.8	0.013	0.007	18.16
8.4.7	0.009	0.009	18.13
8.4.6	0.012	0.007	18.17
8.4.5	0.015	0.005	18.07
8.4.4	0.012	0.007	18.05
8.4.3	0.011	0.007	17.91
8.4.2	0.011	0.009	17.90
8.4.1	0.011	0.008	17.89
8.3.33	0.012	0.009	18.70
8.3.32	0.011	0.010	18.58
8.3.31	0.010	0.010	18.68
8.3.30	0.010	0.005	18.53
8.3.29	0.007	0.002	18.53
8.3.28	0.011	0.010	18.54
8.3.27	0.008	0.009	17.24
8.3.26	0.004	0.004	17.24
8.3.25	0.011	0.007	17.24
8.3.24	0.009	0.010	17.24
8.3.23	0.011	0.007	17.24
8.3.22	0.012	0.008	17.24
8.3.21	0.013	0.007	17.24
8.3.20	0.012	0.007	17.24
8.3.19	0.008	0.011	17.24
8.3.18	0.014	0.006	17.24
8.3.17	0.013	0.007	17.24
8.3.16	0.010	0.010	17.24
8.3.15	0.010	0.012	17.24
8.3.14	0.012	0.008	17.24
8.3.13	0.009	0.009	17.24
8.3.12	0.011	0.010	17.24
8.3.11	0.011	0.009	17.24
8.3.10	0.009	0.009	17.24
8.3.9	0.003	0.005	17.24
8.3.8	0.014	0.004	17.24
8.3.7	0.009	0.009	17.24
8.3.6	0.014	0.003	17.24
8.3.5	0.008	0.008	17.24
8.3.4	0.007	0.003	18.09
8.3.3	0.006	0.002	18.09
8.3.2	0.005	0.003	18.03
8.3.1	0.006	0.003	18.16
8.3.0	0.005	0.004	18.03
8.2.33	0.005	0.004	18.19
8.2.32	0.003	0.005	18.29
8.2.31	0.016	0.004	18.18

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