如何在PHP中的foreach循环中返回一个数组[重复]

Question

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• How to echo or print an array in PHP? 11 answers

I would like to do certain calculation in a function that takes a constant value against different values. To do that I created an array and a variable and also a loop that will take each member of the array and the constant value and pass them to the function that does the calculation. I would like to get an array and then I can do more calculations subsequently.

function subtract($a, $b){
    $c=$b-$a;
    return $c. ',';
    }
    $r=3;
$numbers = array(12, 11, 6, 9);

foreach ($numbers as $index=>$value) {
    $deductions=array(subtract($r, $value));
    //$minimum=min($deductions);
    if (is_array($deductions)){
    //echo $deductions;
    }else{
        //echo "not array";
    }
}
//$minimum=min($deductions);
//echo $minimum;
echo $deductions;

I get "Array" and not 9,8,3,6 Why is this? Any help is greatly appreciated. echo was partial problem, I get Array ( [0] => 6, ) not 9,8,3,6 as I expected?

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Answer 1

You cannot echo an array. Try using print_r($deductions) or var_dump($deductions).

Also, the following line is likely incorrect:

$deductions=array(subtract($r, $value));

This line will keep replacing the previous $deductions variable so you only end up with one value in your array (6) because 9-3 is 6. If you are wanting to create an array of values you need to add the new value to the array as follows:

$deductions[] = subtract($r, $value);