Online PHP editor | perf for ZKmFH

@ 2014-06-06T20:14:53Z

<?php
function utf8($num)
{
    if($num<=0x7F)       return chr($num);
    if($num<=0x7FF)      return chr(($num>>6)+192).chr(($num&63)+128);
    if($num<=0xFFFF)     return chr(($num>>12)+224).chr((($num>>6)&63)+128).chr(($num&63)+128);
    if($num<=0x1FFFFF)   return chr(($num>>18)+240).chr((($num>>12)&63)+128).chr((($num>>6)&63)+128).chr(($num&63)+128);
    return '';
}

function uniord($c)
{
    $ord0 = ord($c{0}); if ($ord0>=0   && $ord0<=127) return $ord0;
    $ord1 = ord($c{1}); if ($ord0>=192 && $ord0<=223) return ($ord0-192)*64 + ($ord1-128);
    $ord2 = ord($c{2}); if ($ord0>=224 && $ord0<=239) return ($ord0-224)*4096 + ($ord1-128)*64 + ($ord2-128);
    $ord3 = ord($c{3}); if ($ord0>=240 && $ord0<=247) return ($ord0-240)*262144 + ($ord1-128)*4096 + ($ord2-128)*64 + ($ord3-128);
    return false;
}
//echo uniord('á'); 225
//echo utf8(0xE1); á
$strTest='holá';
for($i = 0, $n = mb_strlen($strTest); $i < $n; $i++) {
    $mbchar = mb_substr($strTest, $i, 1);
	echo 'current char: '.$mbchar.'  ';
	echo 'uniord= '.uniord($mbchar).'  ';
    echo 'prev dec= '.uniord($mbchar)-1.'  ';
    echo 'prev hex= '.dechex(uniord($mbchar)-1).'  ';
	echo 'prev char= '.utf8(dechex(uniord($mbchar)-1)).'         -     ';

}

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)
5.4.29	0.008	0.039	12.52
5.4.28	0.006	0.039	12.41
5.4.27	0.004	0.042	12.41
5.4.26	0.008	0.055	12.41
5.4.25	0.013	0.050	12.41
5.4.24	0.006	0.054	12.41
5.4.23	0.012	0.055	12.41
5.4.22	0.007	0.046	12.40
5.4.21	0.011	0.041	12.40
5.4.20	0.004	0.043	12.41
5.4.19	0.006	0.040	12.40
5.4.18	0.005	0.039	12.40
5.4.17	0.006	0.037	12.41
5.4.16	0.006	0.040	12.40
5.4.15	0.012	0.036	12.39
5.4.14	0.006	0.054	12.09
5.4.13	0.005	0.044	12.07
5.4.12	0.014	0.044	12.03
5.4.11	0.015	0.049	12.03
5.4.10	0.010	0.046	12.03
5.4.9	0.009	0.051	12.03
5.4.8	0.008	0.054	12.03
5.4.7	0.010	0.049	12.03
5.4.6	0.009	0.052	12.03
5.4.5	0.008	0.055	12.03
5.4.4	0.006	0.047	12.02
5.4.3	0.011	0.059	12.01
5.4.2	0.004	0.055	12.01
5.4.1	0.009	0.050	12.01
5.4.0	0.005	0.041	11.50
5.3.28	0.007	0.040	12.71
5.3.27	0.008	0.041	12.73
5.3.26	0.012	0.036	12.72
5.3.25	0.007	0.040	12.72
5.3.24	0.011	0.044	12.72
5.3.23	0.009	0.046	12.71
5.3.22	0.006	0.038	12.68
5.3.21	0.008	0.038	12.68
5.3.20	0.006	0.043	12.68
5.3.19	0.006	0.047	12.68
5.3.18	0.006	0.044	12.68
5.3.17	0.005	0.040	12.67
5.3.16	0.006	0.038	12.68
5.3.15	0.008	0.045	12.67
5.3.14	0.011	0.048	12.67
5.3.13	0.004	0.041	12.66
5.3.12	0.005	0.039	12.66
5.3.11	0.006	0.039	12.66
5.3.10	0.007	0.043	12.14
5.3.9	0.009	0.050	12.13
5.3.8	0.008	0.050	12.12
5.3.7	0.009	0.049	12.13
5.3.6	0.009	0.044	12.11
5.3.5	0.005	0.039	12.05
5.3.4	0.012	0.036	12.05
5.3.3	0.011	0.046	12.01
5.3.2	0.007	0.044	11.79
5.3.1	0.008	0.041	11.75
5.3.0	0.005	0.050	11.74

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