When I was writing PHP today, I found that $_POST["arr"] could not obtain the array of parameter arr. Please record it.
For example, the following form needs to be submitted:
Using $_POST["arr"] can only get the value of the last selected checkbox. To get the value of all selected checkboxes, you need to modify the form as follows:
In this way, you can use $_POST["arr"] to get the values of all selected checkboxes.
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