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run code in 150+ php & hhvm versions
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<?php $val = '853.51'; $a = array(); $a['am'] = (float) $val; $b = ($a['am'] + 212.515); echo $val; print_r($a); echo $b;
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
853.51Array ( [am] => 853.51 ) 1066.025