如何从foreach中的$ key获取键名（$ _ POST为$ key => $ value）{

Question

I have dynamic field names that are being posted to my form processor. The names are formatted like editnote|9. |9 being the ID of the note to edit. If I use this code:

foreach($_POST as $key) {

    $editcheck = explode('|', $key);

    if($editcheck[0] == 'editnote') {
        echo $editcheck[1];
    }
}

I can properly get the ID of 9, but I cannot get the value. I have tried:

foreach($_POST as $key => $value) {

    $editcheck = explode('|', $key);

    if($editcheck[0] == 'editnote') {
        $clsCNA->updatenote($editcheck[1], $_POST[$key]);
    }
}

But with this code, I can only get the value and not the key name to get the note ID I want to edit.

So basically, I want foreach($_POST as $key => $value) to somehow allow me to get the name of $key so I can explode it to get the ID number.

Any ideas?

I am trying to send to my class like this:

$clsCNA->updatenote(ID From key name, Value of key)

Answer 1

If I use this code:

foreach($_POST as $key) {

    $editcheck = explode('|', $key);

    if($editcheck[0] == 'editnote') {
        echo $editcheck[1];
    }
}

I can properly get the ID of 9...

foreach($_POST as $key => $value) {

CUT ...

As PHP's foreach loop using one variable will only take the values of the array. The exact names chosen does not determine what what goes into the variables. Similarly found by method calls. This will be put the Value into the $key variable.

In the second example you are using the $key => $value syntax. Here the loop puts the Key into the $key variable and the Value into the $value variable.

What this means is that your $key variable is not the same in both examples. In one it holds the Values of the array in the other it holds the Keys.