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<?php $n = 0b1111111111111111111111111111111111111111111111111111111111111111; var_dump($n); var_dump(sprintf("%.16E", $n)); var_dump(sprintf("%.17E", $n)); var_dump(sprintf("%.16G", $n)); var_dump(sprintf("%.17G", $n)); var_dump(sprintf("%.18G", $n));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
float(1.844674407370955E+19) string(22) "1.8446744073709550E+19" string(23) "1.84467440737095496E+19" string(21) "1.844674407370955E+19" string(21) "1.844674407370955E+19" string(23) "1.84467440737095496E+19"
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
float(1.844674407371E+19) string(22) "1.8446744073709550E+19" string(23) "1.84467440737095496E+19" string(21) "1.844674407370955E+19" string(21) "1.844674407370955E+19" string(23) "1.84467440737095496E+19"

preferences:
151.39 ms | 403 KiB | 179 Q