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<?php $foo = (float) (PHP_INT_MAX ); $foo *= 2; ini_set('precision', 64); if ($foo == 1.844674407371E+19) { echo "true"; } else { echo "$foo != 1.844674407371E+19"; }
Output for 5.4.35 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 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 - 8.3.6
18446744073709551616 != 1.844674407371E+19
Output for 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.34
Warning: ini_set() has been disabled for security reasons in /in/8GSSC on line 7 1.844674407371E+19 != 1.844674407371E+19
Output for 4.3.5 - 4.3.11, 5.0.0 - 5.0.4
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/8GSSC on line 3 Warning: ini_set() has been disabled for security reasons in /in/8GSSC on line 7 0 != 1.844674407371E+19
Output for 4.3.1 - 4.3.4
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/8GSSC on line 3 Warning: ini_set,pcntl_fork() has been disabled for security reasons in /in/8GSSC on line 7 0 != 1.844674407371E+19
Output for 4.3.0
Notice: Use of undefined constant PHP_INT_MAX - assumed 'PHP_INT_MAX' in /in/8GSSC on line 3 0 != 1.844674407371E+19

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