Convert flat array to a delimited string to be saved in the database

You can use the implode() function to convert an array to a delimited string in PHP. Here's an example:

How to use the implode() function to convert an array to a delimited string in PHP?

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You can then save this string in the database. To convert the delimited string back to an array, you can use the explode() function:

How to use the explode() function to convert the delimited string back to an array in PHP?

Example of join() function in PHP