When using the code below in a function ($floor & $lift are passed in but I've added them here for demonstration) I'm getting an Notice: Undefined offset: 20 on the last return statement.
The last return is the mean that's mean to be used in this example but why am I getting the Notice: Undefined offset: 20? If I'm not mistake (which I clearly am) the array_key_exists() function should be preventing this? I've also tried it with isset() with no success.
$floor = 20;
$lift = false;
$moving = array(
"no_lift" => array(
1 => 0,
2 => 13,
3 => 17,
4 => 20
),
"lift" => array(
1 => 0,
2 => 10,
3 => 10,
4 => 20
)
);
switch ( $lift ) {
case true:
return ( isset( $moving["lift"][ $floor ] ) ? $moving["lift"][ $floor ] : $moving["lift"][ end( $moving["lift"] ) ] );
break;
case false:
return ( array_key_exists( $floor, $moving["no_lift"] ) ? $moving["no_lift"][ $floor ] : $moving["no_lift"][ end( $moving["no_lift"] ) ] );
break;
}
end returns the last value from an array, so
$moving["lift"][ end( $moving["lift"] ) ]
and
$moving["no_lift"][ end( $moving["no_lift"] ) ]
will both be, in effect,
$moving["no_lift"][ 20 ]
If you are intending to look for something in the array and return the last item if it isn't found, you can use in_array if you're looking for a value
if ($lift) {
return in_array($floor, $moving['lift']) ? $floor : end($moving['lift']);
} else {
return in_array($floor, $moving['no_lift']) ? $floor : end($moving['no_lift']);
}
or isset if you're looking for a key.
if ($lift) {
return isset($floor, $moving['lift']) ? $moving['lift'][$floor] : end($moving['lift']);
} else {
return isset($floor, $moving['no_lift']) ? $moving['no_lift'][$floor] : end($moving['no_lift']);
}
You can use array_key_exists rather than isset if some of the values in the array may be null. (You can check the answers here for a bit more of a description about that.)