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I retrieve a laravel collection from a database on which I want to update certain values based on three calculations. But before I do the calculations I first check if all the relevant collection items is not null. I can check if they are null but for some reason cannot rerieve an error variable that has Controller function scope to tell a user that a variable has not been set.
$error_arr = [];
$calculation = FertilApp::calculation($product, $farm, $agent);
$calculation->each(function ($item, $key) {
if ($item->ha === null) {
$error_arr[] = 'Prices has been updated';
$error_arr[] = 'But no calculation has been done, please update following block:' . $item->block;
return false;
}
});
The variable$error_arr returns an empty array even though I know theha key isnull.
The alternative is to use a normalforeach() loop. I have tried it and it works, but I really want to know why this is not working.
Can someone please help to give me a clue to why this collectioneach() method is denying my variable access to values from outside the collection method?
EDIT: If I try to pass my variable as a parameter I get the following error messageCannot use a scalar value as an array.
Laravel version: 5.6.39
Try aglobal statement:
$calculation->each(function ($item, $key) {
global $error_arr;
$error_arr is empty in your code, because it doesn't exist in the scope of the callbackfunction of youreach method. Unlike other languages ??“? like JavaScript ??“? variables outside a function aren't accessible by default inside the function. See PHP's documentation on variable scope for details.
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