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run code in 200+ php & hhvm versions
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<?php $var = '10.25E'; $number = (float)$var; $letter = substr($var, strlen($number)); var_dump(array($number, $letter));
Output for 4.3.0 - 7.2.0
array(2) { [0]=> float(10.25) [1]=> string(1) "E" }