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<? $a = 'a'; $b = '3'; echo (isset ($a) && isset ($b) && !is_numeric (($a * $b) . '') && (($a * $b) != INF)) ? 1 : 0; ?>
Output for 7.1.0
Warning: A non-numeric value encountered in /in/4nKoZ on line 4 0
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
0
Output for 4.3.0 - 5.3.29
<? $a = 'a'; $b = '3'; echo (isset ($a) && isset ($b) && !is_numeric (($a * $b) . '') && (($a * $b) != INF)) ? 1 : 0; ?>