PHP calculation

Question

I'm trying to output a value from xml this is what I do -

<?php
    echo $responseTemp->Items->Item->CustomerReviews->AverageRating;
?>

This outputs 4.5, but when I change it to the code below it displays as 8. Why isn't it displaying as 9? Thanks.

<?php
echo $responseTemp->Items->Item->CustomerReviews->AverageRating*2;
?>

could you try echo (float)$responseTemp->Items->Item->CustomerReviews->AverageRating * 2 — Kyle
– Kyle, Commented Nov 25, 2009 at 17:58

Sampson · Accepted Answer · 2009-11-25 17:58:42Z

6

Try casting the value to a numerical value first.

$num = (double) $responseTemp->Items->Item->CustomerReviews->AverageRating;

echo $num * 2;

See Type Juggling and String Conversion to Numbers on the PHP website for more information.

answered Nov 25, 2009 at 17:58

Sampson

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1 Comment

Kzqai Over a year ago

Yeah, if you are expecting a double, enforce that it will be.

Mike · Accepted Answer · 2009-11-25 18:04:07Z

2

If you are looking for a decimal value without doing typecasting, you have to multiply by a number with a decimal. Otherwise it will return a regular integer like the number you gave it.

Try multiplying by 2.0

echo $responseTemp->Items->Item->CustomerReviews->AverageRating*2.0;

answered Nov 25, 2009 at 18:04

Mike

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2 Comments

Kzqai Over a year ago

Enforcing the expectation on the known number seems less useful than making sure that the variable is what you expect it to be, e.g. echo (double) $responseTemp->Items->Item->CustomerReviews->AverageRating*2.0;

Mike Over a year ago

I know it's not proper, I was just offering another explanation as to why it wasn't working.

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