3v4l.org

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<?php $arr = array(true,true,false,false,true,false); $res = array_keys($arr, true); var_dump($res); echo $res[array_rand($res)];
Output for 5.5.4, 5.5.13, 5.5.16 - 5.5.18, 5.5.24, 5.5.26, 5.5.29, 5.5.31 - 5.5.32, 5.5.36 - 5.5.37, 5.6.3 - 5.6.5, 5.6.11, 5.6.13 - 5.6.14, 5.6.18 - 5.6.20, 5.6.22, 5.6.24, 5.6.28 - 5.6.29, 7.0.9, 7.0.14, 7.0.16, 7.0.20, 7.1.4, 7.1.7, 7.1.29, 7.1.31 - 7.1.32, 7.2.1 - 7.2.2, 7.2.7 - 7.2.9, 7.2.11, 7.2.15 - 7.2.16, 7.2.18, 7.2.20, 7.2.22, 7.2.24, 7.3.2 - 7.3.3, 7.3.8 - 7.3.9, 7.3.12
array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(4) } 1
Output for 5.5.0, 5.5.5, 5.5.7, 5.5.9 - 5.5.10, 5.5.12, 5.5.14, 5.5.19, 5.5.21, 5.5.23, 5.5.25, 5.5.30, 5.5.33 - 5.5.35, 5.5.38, 5.6.6, 5.6.8 - 5.6.9, 5.6.12, 5.6.16 - 5.6.17, 5.6.21, 5.6.23, 5.6.25, 5.6.27, 5.6.30, 7.0.0 - 7.0.1, 7.0.3 - 7.0.4, 7.0.6 - 7.0.8, 7.0.10, 7.0.13, 7.0.15, 7.0.17 - 7.0.18, 7.1.5, 7.1.26, 7.1.28, 7.2.4 - 7.2.5, 7.2.10, 7.2.12 - 7.2.13, 7.2.17, 7.2.19, 7.2.21, 7.3.0 - 7.3.1, 7.3.4, 7.3.6 - 7.3.7, 7.3.10 - 7.3.11
array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(4) } 4
Output for 5.5.1 - 5.5.3, 5.5.6, 5.5.8, 5.5.11, 5.5.15, 5.5.20, 5.5.22, 5.5.27 - 5.5.28, 5.6.0 - 5.6.2, 5.6.7, 5.6.10, 5.6.15, 5.6.26, 7.0.2, 7.0.5, 7.0.11 - 7.0.12, 7.0.19, 7.1.0 - 7.1.3, 7.1.6, 7.1.25, 7.1.27, 7.1.30, 7.1.33, 7.2.0, 7.2.3, 7.2.6, 7.2.14, 7.2.23, 7.3.5
array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(4) } 0

preferences:
52.35 ms | 412 KiB | 5 Q