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run code in 200+ php & hhvm versions
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<?php $b = 0304; $c = 304; if (is_numeric($b)) { echo 'b is num'; } if (is_numeric($c)) { echo 'c is num'; }
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
b is numc is num