Removing certain elements of array not working - php

Question

i have this array, and all i want it to do is cycle through and just remove certain elements that appear in the if, however whenever i output the array it always just shows
array(0) { }
instead of
["addon_h_id"]=> string(1) "1"
Here is the code which cycles through it, if i remove this code then the array displays as normal
foreach ($new_shopping_array as $columnName => $columnData) {
if($columnName == "s_list_id" || "user_id"){
unset($new_shopping_array[$columnName]);
}
}
Thanks for any and all help

Answer 1

Operator precedence: You're doing $columnName = "s_list_id", then ORing the result of that against "user_id"
if($columnName == "s_list_id" || $columnName == "user_id"){

Answer 2

The problem is your if statement:
if($columnName == "s_list_id" || "user_id")
The string "user_id" will evaluate to true so all values will be removed.
You probably want something like:
if (in_array($columnName, array('s_list_id', 'user_id')))

Answer 3

How about:
$new_array = array();
foreach ($new_shopping_array as $columnName => $columnData)
{
if ($columnName != "s_list_id" && $columnName != "user_id")
{
$new_array[$columnName] = $columnData;
}
}
$new_array contains the data you need.
If you prefer your solution you will need to alter the conditional a bit like so:
foreach ($new_shopping_array as $columnName => $columnData)
{
if ($columnName == "s_list_id" || $columnName == "user_id")
{
unset($new_shopping_array[$columnName]);
}
}
The way it was written it told php that if $columnName is equal to s_list_id OR "user_id". The condition was not in the columnName and "user_id" validates as TRUE (since it has something in there). So your conditional was always TRUE thus removing everything from the original array.
HTH