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Php – What value does the html datepicker send when the user does not select a date?

I’m writing some PHP to display and process an input form that includes a date picker, identified by

<input type="date" id="offdate" name="offdate">

When the user selects a date, I’ve placed the date in a session variable, and what I’d like to do is use the session variable if the user doesn’t select another date value.

Is there a way in PHP to identify if the date picker value is empty? I see plenty of examples in Javascript but I didn’t see any PHP examples.

I’ve tried using the empty() and is_null() functions but can’t find one that will identify an empty date picker value.

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2

Answers


  1. 0

    Based on the information you provided, if you want to check the session value when the page is being built by php before sending it to the client the empty() or is_null() methods will suffice.

    Now, if you want to check the session variable after the page is rendered into the client you should make a ajax request to some endpoint to check it and return a boolean or something.

    If you want to check if the html field has a value after being rendered into the client you should use javascript.

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  2. 0

    In PHP, you can check if a date picker value is empty using the following approaches:

    Using isset() and $_POST or $_REQUEST:
    If your form uses the POST method, you can check whether the date picker value is set in the $_POST array. For example:

    if (isset($_POST['offdate'])) {
// The date picker value is not empty
$selectedDate = $_POST['offdate'];
// Use $selectedDate as needed
} else {
// The date picker value is empty
// Handle this case (e.g., use a default value)
}

    If your form uses the GET method, replace $_POST with $_GET or use $_REQUEST to handle both methods.

    Using empty():

    The empty() function in PHP checks whether a variable is considered “empty.” It works for empty strings, null values, and other cases.
    You can use empty() to check if the date picker value is empty:

    if (!empty($_POST['offdate'])) {
// The date picker value is not empty
$selectedDate = $_POST['offdate'];
// Use $selectedDate as needed
} else {
// The date picker value is empty
// Handle this case (e.g., use a default value)
}
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