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We'll use our collection to create a shopping list that combines all recipe ingredients.
NOTE in_array vs array_key_exists
in_array will check the "value" in an array while array_key_exists will check the "key" in an array.
Code Sample
This code will NOT handle all plural vs singular ingredients, but this will get you started. You could be adding "es" or changing "y" to "ies".
public function getCombinedIngredients()
{
$ingredients = array();
foreach ($this->recipes as $recipe) {
foreach ($recipe->getIngredients() as $i) {
$item = $i['item'];
if (strpos($item, ",")) {
$item = strstr($item, ",", true);
}
if (array_key_exists($item . "s", $ingredients)) {
$item .= "s";
} else if (array_key_exists(substr($item,0,-1),$ingredients)) {
$item = substr($ingredient,0,-1);
}
$ingredients[$item][] = array($i["amount"],$i["measure"]);
}
}
return $ingredients;
}
Documentation
Challenge
Setup calculations to return the amount of each item.
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The cookbook is coming along nicely, and
0:00
we've had the chance to explore filtering
and passing objects between collections.
0:02
By using an object,
we're able to group the data and
0:07
the functionality of our
cookbook into one place.
0:10
There's one more feature that I'd really
like to have for this collection.
0:13
A shopping list that combines
all recipe ingredients.
0:17
Like we did with listing the recipe
titles, we pull the data in our recipe
0:21
collection, then use our render
class to display the data.
0:25
We'll start out with a simple
list of items that you
0:29
can expand to show a more
detailed representation.
0:33
In our recipes collection,
let's add a new method,
0:37
public function getCombinedIngredients().
0:41
We want to create a master
list of ingredients,
0:52
so let's initialize an ingredients array.
0:55
We're going to want to loop through
each recipe in this collection,
1:04
then loop through all the ingredients
in each of those recipes.
1:07
We'll add the item as
the key in our array.
1:30
Then we'll add an inner array
element to that ingredient.
1:40
We'll give it the amount, And the measure.
1:48
Now we can return the ingredients.
2:00
We now have our master array of
ingredients from our collection of
2:06
recipes.
2:10
Next, we need to set up
the display in the render class.
2:10
We'll create a new method.
2:16
This is a static function
that we'll call listShopping.
2:22
And we'll pass in the ingredient_list.
2:29
The first thing we want to
do is sort on the key, so
2:38
we use ksort with our ingredient list.
2:42
Now we're ready to return
our shopping list.
2:51
We'll use the implode function again.
2:53
Have you noticed how much
I like this function?
2:56
This time, we want to return
the keys instead of the values, so
3:05
we're going to use another built-in
function called array_keys.
3:09
And we pass it our array.
3:16
Let's go back to the cookbook file and
3:22
use our shopping list on
our breakfast collection.
3:25
We render our list, shopping, and we pass
it, our breakfast, getCombinedIngredients.
3:35
Let's add a title to this.
3:42
Now we're ready to run the script.
3:54
We see some of our ingredients, but
they don't all fit in this console, so
4:03
let's display this in a browser.
4:07
We're going to View Page Source,
now we can see a better list.
4:13
I see a nice shopping list of
items sorted alphabetically.
4:18
The problem is that some of our
ingredients are duplicated.
4:22
We have Eggs, singular, Eggs,
plural, and Eggs, Beaten.
4:26
Let's modify our getCombinedIngredients
4:32
method to better combine
these ingredients.
4:36
We're going to be doing a few things with
the items, so let's create a new variable.
4:39
We'll call this item,
we'll set it equal to the ing["item"].
4:44
Now let's also change our variable
within our ingredients to item.
4:52
The first thing I want to do is
check if our item contains a comma.
4:57
If so, we want to use only
the part before the comma.
5:02
I'm going to be using a couple
more built-in PHP functions.
5:07
So check the teacher's notes to learn
more about each of these functions.
5:10
if (strpos, for string position,
and we're gonna check our item,
5:15
and we're going to check for
the string position of a comma.
5:21
This will return the first
numeric position of the first
5:26
occurrence of our search,
which is the comma.
5:32
If our comma is not found,
it will return false.
5:36
I also want to note that
the position is zero-indexed.
5:40
So if the comma is in the first position,
it will return 0,
5:44
which would also evaluate to false.
5:48
That's perfect for our use case here,
because if a comma is the first character,
5:50
there's nothing to grab before the comma.
5:55
If the comma is found
in any other position,
5:58
this statement will evaluate to true.
6:01
And we can grab only the part
of the string before the comma.
6:03
I'm going to set item = strstr
to pull a portion of the string.
6:08
I'll pass the item string,
the comma for the search.
6:15
And finally, true,
6:21
which will tell the function to
return the portion before the comma.
6:22
Let's save this and refresh the browser.
6:27
Now we can see that we no
longer have our Eggs, Beaten.
6:33
But we still have both the singular and
plural form of eggs.
6:37
So next, I want to check if this
item is already in the array
6:41
as its singular or plural version.
6:46
I'm going to start by checking
if our item ends in an S.
6:49
I'll use if (substr,
start with the item, and
6:53
then we're going to use -1 to grab
the last character in this string.
6:59
I then compare this last
character to the character s.
7:06
If the last character is an s,
I also want to check if
7:12
the item exists as a key
in the array without an s.
7:17
So we'll combine our comparisons, and
7:21
then we'll use the function
array_key_exists.
7:25
Next, we'll use the rtrim function to
7:30
trim the s from the right
side of our item string.
7:34
And we're going to check
in the ingredients array.
7:39
If a key exists without an s,
we'll remove the s from our item.
7:49
So item = rtrim,
7:55
the item s.
7:59
Finally, if the item
did not end with an s,
8:03
we're going to check if the item
with an s is a key in the array.
8:07
else if (array_key_exists, and
8:13
we're going to pass the item, plus an s.
8:18
And check our ingredients If so,
8:27
we want to use the item with an s,
item += "s".
8:34
Let's go back to
the browser one last time.
8:39
This time, we'll see that we only have
8:42
a single item that starts with Egg.
8:47
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