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<?php function generateRandomString($length = 10) { $characters = '0123456789abcdefghijklmnopqrstuvwxyz-_.'; $charactersLength = strlen($characters); $randomString = ''; for ($i = 0; $i < $length; $i++) { $randomString .= $characters[rand(0, $charactersLength - 1)]; } return $randomString; } $unique = array(); for ($i = 0; $i < 9000000; $i++) { $u=$i+1; $random = generateRandomString(5); if(!in_array($random, $unique)){ echo $u.".m".$random."@[server]\n"; $unique[] = $random; gc_collect_cycles(); }else{ echo "duplicate detected"; $i--; } } echo memory_get_peak_usage();

Version	System time (s)	User time (s)	Memory (MiB)
7.4.0	0.019	0.061	14.92
7.3.12	0.026	0.040	14.69
7.3.11	0.013	0.044	14.84
7.3.10	0.021	0.040	14.96
7.3.9	0.026	0.079	14.92
7.3.8	0.017	0.043	14.89
7.2.25	0.025	0.058	14.90
7.2.24	0.024	0.074	14.88
7.2.23	0.022	0.068	15.12
7.2.22	0.020	0.067	15.11
7.2.21	0.020	0.044	14.80
7.1.33	0.018	0.063	13.97
7.1.32	0.024	0.078	14.16
7.1.31	0.022	0.044	13.91

Version

System time (s)

User time (s)

Memory (MiB)

7.4.0

0.019

0.061

14.92

7.3.12

0.026

0.040

14.69

7.3.11

0.013

0.044

14.84

7.3.10

0.021

0.040

14.96

7.3.9

0.026

0.079

14.92

7.3.8

0.017

0.043

14.89

7.2.25

0.025

0.058

14.90

7.2.24

0.024

0.074

14.88

7.2.23

0.022

0.068

15.12

7.2.22

0.020

0.067

15.11

7.2.21

0.020

0.044

14.80

7.1.33

0.018

0.063

13.97

7.1.32

0.024

0.078

14.16

7.1.31

0.022

0.044

13.91

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