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<?php $k=0.1+0.7; var_dump($k); //return 0.8 var_dump(0.8 == $k); //return false $res = (string)$k - json_encode($k); print($res."\n\n"); //return 1.1102230246252E-16 ini_set('precision', '-1'); $k=0.1+0.7; var_dump($k); //return 0.7999999999999999 var_dump(0.8 == $k); //return false $res = (string)$k - json_encode($k); print($res); //return 0
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
float(0.7999999999999999) bool(false) 1.1102230246252E-16 float(0.7999999999999999) bool(false) 0
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
float(0.8) bool(false) 1.1102230246252E-16 float(0.7999999999999999) bool(false) 0
Output for 5.6.38, 7.0.0 - 7.0.33
float(0.8) bool(false) 0 float(0.8) bool(false) 0
preferences:
139.46 ms | 408 KiB | 5 Q