Fraction to decimal

[timstring]

I am trying to take apart a string that includes a whole number and a fraction-- 1 2/3. Rooting out the fraction was relatively easy, but I can't get a function that will reliably pull out the whole number. I have tried several string functions, and no matter which one, they all return the position of the space at character 1.

$SlashPos =stripos($qty[$count],"/");
	$SpacePos =stripos($qty[$count]," ");



$Numerator = substr($qty[$count], $SlashPos-1,1);
$Denominator = substr($qty[$count], $SlashPos+1,1);	

if($Denominator > 0) $Fraction = $Numerator / $Denominator;

if ($SpacePos > 0)  $Whole = substr($qty[$count], 1, $SpacePos);

$CalcNum = $Whole + $Fraction;


if ($SpacePos == 0 && $SlashPos == 0)	$CalcNum = $qty[$count];

The routine is correctly pulling the position of the '/', but not the space. $SpacePos = 1 all the time there is a fraction in the number.

An idea?😕

[Derokorian]

That's because position 0 is the first position, meaning 1 is at position 0, space is at position 1, 2 is at position 3, etc... Just as the first element in an array is at index zero (unless otherwise specified).

[bradgrafelman]

Seems like this would be more concise/flexible using regular expressions instead, e.g.:

@(?P<Whole>[1-9][0-9]*) +(?P<Numerator>[1-9][0-9]*) */ *(?P<Denominator>[1-9][0-9]*)@

[Weedpacket]

Another way of getting the integer part of "1 2/3" is to write (int)"1 2/3" (see String Conversion to Numbers).