3v4l.org

run code in 300+ PHP versions simultaneously
<?php $c = 20000; function output1() { return 'h'.'e'.'l'.'l'.'o,'.' w'.'o'.'r'.'l'.'d'; } function output2() { echo 'h','e','l','l','o,',' w','o','r','l','d'; } $t = microtime(true); for ($i = 0; $i < $c; $i++) { $str = output1(); } var_dump(round(microtime(true) - $t, 6)); $t = microtime(true); for ($i = 0; $i < $c; $i++) { ob_start(); output2(); $str = ob_get_contents(); ob_end_clean(); } var_dump(round(microtime(true) - $t, 6)); $t = microtime(true); ob_start(); for ($i = 0; $i < $c; $i++) { output2(); } $str = ob_get_contents(); ob_end_clean(); var_dump(round(microtime(true) - $t, 6));
Output for 7.4.4
float(0.001294) float(0.016415) float(0.00863)
Output for 7.4.3
float(0.000559) float(0.013535) float(0.008219)
Output for 7.4.2
float(0.000548) float(0.016216) float(0.008315)
Output for 7.4.1
float(0.001027) float(0.017558) float(0.008166)
Output for 7.4.0
float(0.000533) float(0.013136) float(0.009451)
Output for 7.3.16
float(0.00066) float(0.012517) float(0.008261)
Output for 7.3.15
float(0.000643) float(0.014613) float(0.00904)
Output for 7.3.14
float(0.000645) float(0.013473) float(0.009123)
Output for 7.3.13
float(0.00063) float(0.012356) float(0.008104)
Output for 7.3.12
float(0.000642) float(0.013255) float(0.009312)
Output for 7.3.11
float(0.000561) float(0.012278) float(0.008135)
Output for 7.3.10
float(0.000612) float(0.015106) float(0.010715)
Output for 7.3.9
float(0.000558) float(0.014158) float(0.008114)
Output for 7.3.8
float(0.000595) float(0.013557) float(0.008682)
Output for 7.3.7
float(0.00058) float(0.01287) float(0.009218)
Output for 7.3.6
float(0.000639) float(0.013718) float(0.008907)
Output for 7.3.5
float(0.000879) float(0.021101) float(0.011975)
Output for 7.3.4
float(0.000663) float(0.013933) float(0.008719)
Output for 7.3.3
float(0.00057) float(0.013062) float(0.00879)
Output for 7.3.2
float(0.00067) float(0.014396) float(0.007992)
Output for 7.3.1
float(0.000967) float(0.019842) float(0.010585)
Output for 7.3.0
float(0.000865) float(0.013797) float(0.008569)
Output for 7.2.29
float(0.000718) float(0.014043) float(0.008292)
Output for 7.2.28
float(0.000665) float(0.023563) float(0.008342)
Output for 7.2.27
float(0.00082) float(0.017975) float(0.008965)
Output for 7.2.26
float(0.000746) float(0.018604) float(0.009879)
Output for 7.2.25
float(0.000746) float(0.012891) float(0.008375)
Output for 7.2.24
float(0.000675) float(0.012639) float(0.008724)
Output for 7.2.23
float(0.000686) float(0.012777) float(0.008667)
Output for 7.2.22
float(0.000934) float(0.013248) float(0.008627)
Output for 7.2.21
float(0.001728) float(0.013819) float(0.008936)
Output for 7.2.20
float(0.001039) float(0.012818) float(0.00803)
Output for 7.2.19
float(0.000682) float(0.013737) float(0.008471)
Output for 7.2.18
float(0.001014) float(0.013535) float(0.008839)
Output for 7.2.17
float(0.001164) float(0.022748) float(0.011612)
Output for 7.2.16
float(0.000735) float(0.015564) float(0.009284)
Output for 7.2.15
float(0.000766) float(0.014083) float(0.008722)
Output for 7.2.14
float(0.000791) float(0.014266) float(0.008595)
Output for 7.2.13
float(0.000814) float(0.014493) float(0.008518)
Output for 7.2.12
float(0.000662) float(0.014633) float(0.008364)
Output for 7.2.11
float(0.00077) float(0.018332) float(0.008158)
Output for 7.2.10
float(0.00082) float(0.017343) float(0.012281)
Output for 7.2.9
float(0.000768) float(0.013415) float(0.008441)
Output for 7.2.8
float(0.000689) float(0.012753) float(0.008314)
Output for 7.2.7
float(0.000661) float(0.013078) float(0.007997)
Output for 7.2.6
float(0.000665) float(0.012396) float(0.008419)
Output for 7.2.5
float(0.000668) float(0.018111) float(0.015717)
Output for 7.2.4
float(0.000855) float(0.013099) float(0.00869)
Output for 7.2.3
float(0.000772) float(0.014331) float(0.008893)
Output for 7.2.2
float(0.000733) float(0.013229) float(0.008753)
Output for 7.2.1
float(0.000688) float(0.01336) float(0.008416)
Output for 7.2.0
float(0.00081) float(0.013902) float(0.009232)

preferences:
82.03 ms | 401 KiB | 57 Q