$_POST[$val]

[richardw]

I am using PHP V4.3 with the following code. I get these error, it is quite strange.

example in code

// array in a form of question
$thisArr = array('housekeeping1', 'housekeeping2', 'housekeeping3', 'housekeeping4', 'housekeeping5');

foreach( $thisArr as $key=>$val) {
echo $_POST[$val] ;

}

I will get an error,
Notice: Undefined index: housekeeping1 in in ..\logbook_table_class.inc on line 7

[bunner_bob]

The foreach($array as $key=>$value) construct is assuming a multi-dimesional array. You have a numerically indexed array, so you just want to use foreach($array as $value).

A numerically indexed array doesn't have 'keys' (or rather they're assumed to be 0,1,2, etc. corresponding to the element's position in the array).

Example of a multi-dimensional array would be:
$array = array("firstfloor" => "housekeeping1", "secondfloor" => "housekeeping2", "thirdfloow" => "housekeeping3");

• Bob

[LordShryku]

Bygons on the key=>value thing. The notice is to let you know it doesn't find that key in the array. You should be using isset() to check

foreach($thisArr as $val) {
   if(isset($_POST[$val])) {
      echo $_POST[$val];
   }
} 

[bunner_bob]

But if you're doing foreach() on a numerically indexed array, won't it just walk through all the elements? It's not looking for specific named elements, it just gives you what's there. If it's not there, you don't get it.

Or am I wrong?

[LordShryku]

With numbers as the key, the key still exists. So using key=>val will just produce

array(
0=>val
1=>val1
2=>val2
)

and so on. It should still pick up the number as the key, though, in this instance, it's un-neccesary.

[Weedpacket]

Right, the message refers to $_POST['housekeeping1'] not being set, not any supposed absence of the value 'housekeeping1' in the $thisArr array.

[bunner_bob]

Oh right - sorry.