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run code in 200+ php & hhvm versions
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<?php $var = 'test'; $test = '234'; var_dump(is_numeric($$var[0]));
based on u6ihh
Output for hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
bool(true)
Output for 5.6.30
Notice: Undefined variable: t in /in/ZQSPY on line 4 bool(false)