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@ 2015-07-15T18:57:34Z

<?php

print preg_replace('/[^\d\.]/', '', 0.000009);
print "<br/>";
print preg_replace('/[^\d\.]/', '', '0.000009');

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive preview

46.42 ms | 402 KiB | 5 Q