Modify a string

[jdunneirl]

Hi guys,

 

this is my first post so be gentle

 

I have a string of ingredients, eg

 

1kg of salf

20kg of sugar

15kg of something nice

 

 

This is the portion / mix for 1 person, I would like to make it scalable, so for example multiple all ingredients by for two people etc.

 

 

So how do I do this with PHP

 

I am guessing a regexp to look at the string and modify each number by the multiplier

 

 

 

 

Any suggestions would be great thanks guys

 

I have tried google and came up empty

 

 

I think I need to convert the string to an array then modify it?

 

 

John

[AyKay47]

not sure how you have this set up.. but what you need here are variables for the amount of each ingredient needed and a variable for the number of people..

 

$salt = 1; 
$sugar = 20;
$something_nice = 15;
$number_of_people = 3;
if($number_of_people > 1){
    $new_sugar = $sugar * $number_of_people;
    $new_something_nice = $something_nice * $number_of_people;
    $new_salt = $salt * $number_of_people;
}

 

i would create a function to do this instead if it will be needed multiple times..

also i assume that the data will be dynamically created.. so the values will be variables most likely.

[jdunneirl]

Hi AyKay47,

 

Would love to say it was that easy the problem is its coming from a wordpress database, so no idea how to get the ingredients in that manor, all I have is the string

[Nodral]

Provided the values are all give as ##kg substance

 

You can build a function to explode and return just the bit you need.

 

eg

function get_value($input){
$value=explode("kg",$input);
$result=$value[0];
return $result;
}

 

Then if you do

$salt=get_value(1kg of salt);
..
..
..

repeat for all ingredients then use the script that AyKay wrote, you should be ok.

 

If the string is coming out of wordpress in a variable eg $salt="1kg of salt", then just do $salt=get_value($salt) to split the number off.

 

NOTE: This will only work if the string is in the format ##kg of substance

 

 

[AbraCadaver]

Something like this should work.  You can use it in a function and add more functionality if you want:

 

preg_match('/([\d\.]+)([^\s]+)(.*)/', '20kg of sugar', $matches);

$quantity = $matches[1];
$unit = $matches[2];
$ingredient = trim($matches[3]);

You will also need to give some thought as to how to handle scaling up the units, for example when do you move from ml to l or g to kg, etc.

[jdunneirl]

Thanks for all the help guys I managed to strip the function that was given me the values so now I got the numbers I need thanks again

 

John