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<?php ini_set( 'serialize_precision', -1 ); var_dump(json_encode(0.38 * 0.1, JSON_PRETTY_PRINT));
Output for 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
string(20) "0.038000000000000006"
Output for 5.6.38
string(5) "0.038"
preferences:
93.14 ms | 406 KiB | 5 Q