note 102743 added to function.is-float

function isfloat  ($f) {
  $f -= 0;
  if (is_float($f)){
     return true;
  }
  return false;
}

you can try this function for any floating number 
it will check the value
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Manual Page -- http://www.php.net/manual/en/function.is-float.php
Edit        -- https://master.php.net/note/edit/102743
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