How to output decimal numbers in PHP?

Question

I'm trying to pull two numbers from a variable($text) and then multiply them and output the results. The two numbers can be ints and floats.

When I try: $text = "1 photograph - b&w - 2 x 5 in."
I get: The image area is 10
Which is what I want

<?php
$text = "1 photograph - b&w - 2 x 5.5 in.";


  if (preg_match("/[[:digit:]]*\ x [[:digit:]]* /",  $text, $match)) :
   print_r($match);

    $dimensions = trim($match[0]);
    $dimensions = explode(" x ",$dimensions);
    $image_area = (($dimensions[0]) * ($dimensions[1]));



    echo 'The image area is '.($image_area);


  endif;
 ?>

But when I try: $text = "1 photograph - b&w - 2 x 5.5 in."
I get a blank screen

How would I output floats?

my code and output:http://sandbox.onlinephpfunctions.com/code/4b45219fdcb7864442268459621bb506c24ce78f

You regex doesn't match. ' ' !== '.'

Pinke Helga
– Pinke Helga

2019-01-23 17:41:07 +00:00
Commented Jan 23, 2019 at 17:41 — Pinke Helga
– Pinke Helga, Commented Jan 23, 2019 at 17:41

aynber · Accepted Answer · 2019-01-23 17:44:09Z

1

You have an extra space at the end of the regex, which would break it. Remove it, and it would match 2 x 5. You should be able to extend it further by adding \. to each side of the regex:

if (preg_match("/[[:digit:]\.]*\ x [[:digit:]\.]*/",  $text, $match)) {

answered Jan 23, 2019 at 17:44

aynber

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Comments

J. Davis · Accepted Answer · 2019-01-23 17:51:20Z

1

The regex expression isn't robust enough to distinguish between whole numbers and decimal numbers. The [[:digit:]] operator only matches characters 0-9.

This site is useful for creating and testing regex:

https://regex101.com/

edited Jan 23, 2019 at 17:51

answered Jan 23, 2019 at 17:43

J. Davis

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Comments

Pinke Helga · Accepted Answer · 2019-01-23 17:58:45Z

1

Your regex does not match. You want:

/\d+(?:\.\d+)? x \d+(?:\.\d+)? /

1 or more digits, (optional: dot, 1 or more digits), space, x, space, 1 or more digits, (optional: dot, 1 or more digits), space

test online

edited Jan 23, 2019 at 17:58

answered Jan 23, 2019 at 17:50

Pinke Helga

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