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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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
float(0.7999999999999999) bool(false) 1.1102230246252E-16 float(0.7999999999999999) bool(false) 0
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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:
187.98 ms | 401 KiB | 247 Q