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<?php $value = (string) 1616477400.9510319232940673828125; var_dump( json_encode($value), DateTimeImmutable::createFromFormat( 'U.u', json_encode($value) ), DateTimeImmutable::createFromFormat( 'U.u', number_format($value, 6, '.', '') ), );
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 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
string(16) ""1616477400.951"" bool(false) object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2021-03-23 05:30:00.951000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }
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 string(16) ""1616477400.951"" bool(false) object(DateTimeImmutable)#1 (3) { ["date"]=> string(26) "2021-03-23 05:30:00.951000" ["timezone_type"]=> int(1) ["timezone"]=> string(6) "+00:00" }

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153.61 ms | 402 KiB | 153 Q