How to Implode an Array with \', \' and \'and\' Before the Last Element?

Imploding an Array with ", " and "and" Before the Last Item

Imploding an array into a string using a comma-separated list is a common task. However, when you need to add "and" before the last item, it's not always straightforward.

A Regular Implode Function

The implode() function can be used to concatenate the elements of an array into a string, with a specified separator. For example, the following code would implode an array of drink names into a comma-separated list:

$listArrau = ['coke', 'sprite', 'fanta'];
$listString = implode(', ', $listArrau);

This would produce the following string:

coke, sprite, fanta

Adding "and" Before the Last Item

To insert "and" before the last item, we need to modify the implosion process. Here's a long-line solution:

echo join(' and ', array_filter(array_merge(array(join(', ', array_slice($array, 0, -1))), array_slice($array, -1)), 'strlen'));

This expression breaks down into several steps:

1. Slice the array: Two slices are made, one to get all items except the last one, and another to get only the last item.
2. Merge the slices: The two slices are merged into a one-dimensional array.
3. Filter the array: The merged array is filtered to remove empty elements (ensuring that there are no empty values or trailing separators).
4. Join the array: The filtered array is joined using " and " as the separator, producing the desired string.

Here's a verbose version with the steps separated:

$last = array_slice($array, -1);
$first = join(', ', array_slice($array, 0, -1));
$both = array_filter(array_merge(array($first), $last), 'strlen');
echo join(' and ', $both);

This multi-step approach allows us to handle cases with any number of items, including 0, 1, and 2 items, correctly.

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