Function Arguments From Chapter 3, Page 103

[jskintauy]

Hi All,

 

I am struggling with the naming of values and a comparison operator. I was fine with how this all worked until I ran into this snippet of code. I am not sure how it works or the logic behind it.

 

 

function create_radio($value, $name = 'gallon_price') {

 

// Start the element:

echo '<input type="radio" name="' . $name .'" value="' . $value . '"';

 

// Check for stickiness:

if (isset($_POST[$name]) && ($_POST[$name] == $value)) {

echo ' checked="checked"';

}

 

// Complete the element:

echo " /> $value ";

 

Specifically, the comparison value of ($_POST[$name] == $value) doesn't make since to me. We defined the variable $name as 'gallon_price' and $value as some input which would normally be our supplied gasoline price (a number) I understand this is not really here to comare actual values but to see if they are set, but I don't see how this does this. It seems more logical to see that $value is set. Can someone explain how this works?

 

Signed - Confused a bit.

 

Jim

[HartleySan]

Keep in mind that $name is just a string value that defaults to 'gallon_price' when no explicit value is provided for the $name parameter when the function is called.

With that said, $_POST[$name] really just essentially means $_POST['gallon_price'], which refers to the value input for the 'gallon_price' input field in the submitted form.

 

Does that make sense?

Also, please do not post the same question three times in a row.

Thank you.

[jskintauy]

Hi Hartley,

 

Thanks for the good explanation. I got it!

Sorry on the multiple posts, I didn't think it posted and (doh!) clicking.

 

Jim