How to calculate string which contains letters in PHP?

Question

Hello , i will appriciet the help . Lets say i have string in PHP which is :
$string = "This is 30cm of length and width of 120cm";

and i want to transforme this (keepeng the sentence same)

desirible output to be "This is 11.8'' of length and width of 78.7''

i have the formula for the inches bit , i successfuly can extract just the numbers and calculate them , but thats not work for me beacuse the sentences coming from outside source (csv) file and str_replace() not helping at all :)

Answer 1

$string = "This is 30cm of length and width of 120cm";

preg_replace_callback('/\d+(?:\.\d+)?/', function($m) {
return round(floatval($m[0]) * 0.39370 / 0.5) * 0.5 . '"';
}, $string);

I FOUND THE ANSWER

Answer 2

I used your formula but I got different results, So I used general way to convert cm to inch.

https://code.sololearn.com/wCqw0UTOfB7l/?ref=app