Online PHP editor | perf for RGKJk

<?php declare(strict_types = 1); $n = "5281"; // checking the first byte is enough //---------------------------------------------------------------------------------------- $st = microtime(TRUE); for($i = 0; $i < 1000000; $i++){ $x = is_numeric($n); } echo number_format(microtime(TRUE) - $st, 10) . "\n"; //---------------------------------------------------------------------------------------- $st = microtime(TRUE); for($i = 0; $i < 1000000; $i++){ $x = is_numeric($n[0]); // check only the first byte - makes it a bit slower tho } echo number_format(microtime(TRUE) - $st, 10) . "\n"; //---------------------------------------------------------------------------------------- $digits = [ 0 => TRUE, 1 => TRUE, 2 => TRUE, 3 => TRUE, 4 => TRUE, 5 => TRUE, 6 => TRUE, 7 => TRUE, 8 => TRUE, 9 => TRUE ]; $st = microtime(TRUE); for($i = 0; $i < 1000000; $i++){ $x = isset($digits[$n[0]]); // fastest solution } echo number_format(microtime(TRUE) - $st, 10) . "\n"; //---------------------------------------------------------------------------------------- $st = microtime(TRUE); for($i = 0; $i < 1000000; $i++){ $x = (String)(Int)$n[0] === $n[0]; // slowest solution } echo number_format(microtime(TRUE) - $st, 10) . "\n";

Version	System time (s)	User time (s)	Memory (MiB)
7.2.11	0.118	0.213	14.98
7.2.10	0.013	0.180	14.66
7.2.9	0.107	0.221	14.64
7.2.8	0.046	0.236	14.63
7.2.7	0.022	0.248	14.73
7.2.6	0.178	0.281	14.88
7.2.5	0.010	0.241	15.27
7.2.4	0.013	0.348	14.95
7.2.3	0.269	0.230	14.76
7.2.2	0.017	0.180	14.84
7.2.1	0.060	0.292	15.00
7.2.0	0.029	0.279	14.91
7.1.23	0.063	0.302	13.93
7.1.22	0.041	0.265	13.80
7.1.21	0.010	0.270	14.03
7.1.20	0.042	0.240	13.72
7.1.19	0.052	0.268	13.90
7.1.18	0.026	0.243	13.81
7.1.17	0.006	0.251	13.54
7.1.16	0.109	0.245	13.68
7.1.15	0.036	0.340	13.88
7.1.14	0.227	0.253	13.87
7.1.13	0.049	0.270	13.87
7.1.12	0.019	0.290	13.56
7.1.11	0.013	0.453	13.91
7.1.10	0.182	0.274	13.97
7.1.9	0.068	0.334	13.65
7.1.8	0.182	0.275	13.49
7.1.7	0.013	0.249	13.93
7.1.6	0.045	0.225	31.61
7.1.5	0.091	0.248	31.76
7.1.4	0.813	0.222	31.48
7.1.3	0.039	0.240	31.80
7.1.2	0.023	0.307	31.75
7.1.1	0.174	0.241	13.52
7.1.0	0.191	0.331	13.52
5.6.38	0.012	0.579	14.14

Version

System time (s)

User time (s)

Memory (MiB)

7.2.11

0.118

0.213

14.98

7.2.10

0.013

0.180

14.66

7.2.9

0.107

0.221

14.64

7.2.8

0.046

0.236

14.63

7.2.7

0.022

0.248

14.73

7.2.6

0.178

0.281

14.88

7.2.5

0.010

0.241

15.27

7.2.4

0.013

0.348

14.95

7.2.3

0.269

0.230

14.76

7.2.2

0.017

0.180

14.84

7.2.1

0.060

0.292

15.00

7.2.0

0.029

0.279

14.91

7.1.23

0.063

0.302

13.93

7.1.22

0.041

0.265

13.80

7.1.21

0.010

0.270

14.03

7.1.20

0.042

0.240

13.72

7.1.19

0.052

0.268

13.90

7.1.18

0.026

0.243

13.81

7.1.17

0.006

0.251

13.54

7.1.16

0.109

0.245

13.68

7.1.15

0.036

0.340

13.88

7.1.14

0.227

0.253

13.87

7.1.13

0.049

0.270

13.87

7.1.12

0.019

0.290

13.56

7.1.11

0.013

0.453

13.91

7.1.10

0.182

0.274

13.97

7.1.9

0.068

0.334

13.65

7.1.8

0.182

0.275

13.49

7.1.7

0.013

0.249

13.93

7.1.6

0.045

0.225

31.61

7.1.5

0.091

0.248

31.76

7.1.4

0.813

0.222

31.48

7.1.3

0.039

0.240

31.80

7.1.2

0.023

0.307

31.75

7.1.1

0.174

0.241

13.52

7.1.0

0.191

0.331

13.52

5.6.38

0.012

0.579

14.14