3v4l.org

run code in 300+ PHP versions simultaneously
<?php ini_set("precision", "16"); $f = 1234567890123456789.0; $s = (string)$f; var_dump($f, $s, $f == $s);
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(1.2345678901234568E+18) string(21) "1.234567890123457E+18" bool(false)
Output for 5.2.7 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
float(1.234567890123457E+18) string(21) "1.234567890123457E+18" bool(false)
Output for 5.2.2 - 5.2.6
float(1234567890123457000) string(19) "1234567890123457000" bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.1
float(1234567890123457000) string(21) "1.234567890123457E+18" bool(false)

preferences:
182.64 ms | 402 KiB | 311 Q