how to pass an array in GET in PHP?

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If you want to pass an array as parameter, you would have to add a parameter for each element. Your query string would become:

?arr[]=1&arr[]=2&arr[]=3&arr[]=4

As others have written, you can also serialize and unserialize the array.

But do you really have to send the data to the client again? It looks like you just need a way to persist the data between requests.

In this case, it is better imo to use sessions(docs). This is also more secure as otherwise the client could modify the data.

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