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I noticed that PHP seems to return only values of checked checkboxes. I would like to see a list of checkboxes, not just values of checked checkboxes. Is there a way to detect variables of unchecked boxes?
I asked because I want to be able to update settings. For example, I have a few options that are already checked but if an user decides to uncheck an option, I need to know that unchecked value so I can update the option to be disabled.
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To get all the values from the checked checkboxes, you need to add the square brackets ( [] ) after the name of the checkboxes. When PHP sees the square brackets ( [] ) in the field name, it'll create an associative array of values where the key is the checkbox's name and the values are the selected values.
In order to get the checkbox values, you can use the foreach() method. Note: The foreach() method functions by looping through all checked checkboxes and displaying their values.
The isset() function is an inbuilt function in PHP which checks whether a variable is set and is not NULL. This function also checks if a declared variable, array or array key has null value, if it does, isset() returns false, it returns true in all other possible cases.
I just ran into this problem myself. I solved it by adding a duplicate hidden field with the same name. When the browser sends this information, the second field overrides the first (so ensure that the hidden field comes first).
<input type="hidden" name="foo" value=""> <input type="checkbox" name="foo" value="bar"> If the checkbox is not checked you get:
$_REQUEST[ 'foo' ] == "" If the checkbox is checked you get:
$_REQUEST[ 'foo' ] == "bar" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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