检查关联数组是否为空[重复]

Question

This question already has an answer here:

• Checking if all the array items are empty PHP 9 answers

I have an associative array of id. In the controller I want to check if the array received is empty or not. I have written the following code for it but it does not work.

$product1=$_POST['id'];
$productString = implode(" ",$product1);
echo $productString; 
if(is_null($productString)){
   echo "No Values";
}else {
    echo "Values are present";
}

I have tried with empty() as well but in all the case even if there are no values in the array, which I am converting into a string, it says values are present. There are 5 fixed rows in my table in the view file, so, even if the values are empty the array output shows

Array ( 
    [0] => 
    [1] => 
    [2] => 
    [3] => 
    [4] => 
)

Any help is welcome.

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Answer 1

You can use empty function http://php.net/manual/en/function.empty.php for check emptiness of array. But you have empty rows into your $_POST['id'] array, for remove this row you should filter this rows by array_filter http://php.net/manual/en/function.array-filter.php

$ids = array_filter($_POST['id']);
if (empty($ids)){
    echo "No Values";
}else {
    echo "Values are present";
}