PHP Getting value from a function by form

Question

I want to get a value by the function with forms as the user input but I don't think I'm doing it right can anybody help me.

The code is like when enter number 1 in the form then it will output it by the days like Sunday.

Output:-

Enter days values between (0-6): 1
The day is Monday.

My Code:-

<?php
        function day_of_week($week){
           $week = $_POST['week'];
           $week = array(0 => Sunday, 1 => Monday, 2 => Tuesday, 3 => Wednesday, 4 => Thursday, 5 => Friday, 6 => Saturday);

            return $week;
        }

        if(isset($_POST['submit'])){
            $value = $_POST['value'];
            echo "The day is " . day_of_week($value);
        }
    ?>

    <form method="POST" action="">
        <label>Enter days value between (0-6):</label>
        <input type="text" name="value">
        <input type="submit">
    </form>

I search some code and some code the week can be assigned like

date('w'); 

if(date('w') == 1){
    echo "its monday baby";
}

or also in case code. But I'm not too sure how to actually call the value properly and assigning. Which one is better for assigning, array or date() or case for assigning?

Do help me out to explain why my value is not showing properly too.

Appreciate anyone's helps thank you so much.

Your function day_of_week($week)s wrong.

dspillai
– dspillai

2021-05-25 06:55:56 +00:00
Commented May 25, 2021 at 6:55 — dspillai
– dspillai, Commented May 25, 2021 at 6:55

mickmackusa · Accepted Answer · 2021-09-07 02:31:44Z

1

Change the function as

function day_of_week($x){
    $week = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
    return $week[$x];
}

Don't forget to fill the action part in your form.

<form method="post" action='<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>'>

edited Sep 7, 2021 at 2:31

mickmackusa♦

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answered May 25, 2021 at 6:57

dspillai

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5 Comments

NISHA NAJIHAH Over a year ago

Hi, it doesn't actually show the output why is that? I did write echo

dspillai Over a year ago

Your form action is empty. <form method="POST" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">

NISHA NAJIHAH Over a year ago

I still can't get the answer to show but what does <?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?> do actually?

dspillai Over a year ago

It means your form data will be PHP processed in the same file. Your submit button not properly designed (missing name to triggering the POST call*. Replace it with <input type="submit" name="submit" value="Submit">

NISHA NAJIHAH Over a year ago

Oh I learn something new thank you so that mean if i want something to be process in the same file i use <?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>.

Nalin Nishant · Accepted Answer · 2021-05-25 06:57:09Z

1

You need to add a double quote to a string in key-value pair and then return the days with its position

<?php 
function day_of_week($day){
           $week = array(0 => "Sunday", 1 => "Monday", 2 => "Tuesday", 3 => "Wednesday", 4 => "Thursday", 5 => "Friday", 6 => "Saturday");

            return $week[$day];
        }

if(isset($_POST['submit'])){
            $value = $_POST['value'];
            echo "The day is " . day_of_week($value);
        }
?>
 <form method="POST" action="">
        <label>Enter days value between (0-6):</label>
        <input type="text" name="value">
        <input type="submit">
    </form>

answered May 25, 2021 at 6:57

Nalin Nishant

9161 gold badge7 silver badges22 bronze badges

2 Comments

NISHA NAJIHAH Over a year ago

Oh okay, but what the difference between double quotes and single quote because sometimes I come across a whole code that only uses a single quote and sometimes there like mixes with a single and double quote. Why is that?

NISHA NAJIHAH Over a year ago

Hi, it doesn't actually show the output why is that? I did write echo.

TAHER El Mehdi · Accepted Answer · 2021-05-25 12:16:58Z

1

Generate days of week dynamically by for loop with built-in function date with format l which represents the day of the week.

$weekdays = [];
for($i=0;$i<7;$i++){
    $weekdays[$i] = date('l', strtotime("Sunday this week +$i days"));
}

So array $weekdays will contains days starting from index 0 which is Sunday through Saturday.

print_r($weekdays);

Prints:

Array
(
    [0] => Sunday
    [1] => Monday
    [2] => Tuesday
    [3] => Wednesday
    [4] => Thursday
    [5] => Friday
    [6] => Saturday
)

It would be better to use type="number" instead of text, And use some attributes such as start and max.

<input type="number" name="value" start='0' value="2" max="6">

answered May 25, 2021 at 12:16

TAHER El Mehdi

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3 Comments

NISHA NAJIHAH Over a year ago

Thank you for giving me some tips and the start and max is like telling it can't be over this number right?

TAHER El Mehdi Over a year ago

No problem! Yeah that is what I meant, since it is number, and actually It can be forced to exceed the range of max 6, but you need to control it in the back-end with PHP.

NISHA NAJIHAH Over a year ago

Oh, okay I see really thank you I will take note of this. :)

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