PHP计算 - 输入的百分比

Question

I have a script that calculates the percentage of an input.

$total_debt = "16,000";
$debt_written_off_percentage = 70;
$debt_written_off = ($debt_written_off_percentage / 100) * $total_debt;

$reduced_debt_percentage = 30;
$reduced_debt = ($reduced_debt_percentage / 100) * $total_debt;

echo $total_debt;
echo '<br>';
echo $debt_written_off;
echo '<br>';
echo $reduced_debt;
echo '<br>';
exit();

When I run this script, I get the following output:

16,000
11.2
4.8

Why is it not:

16,000
11,200
4,800

Answer 1

With error_reporting(-1), you'll get:

Notice: A non well formed numeric value encountered in ...

indicating that $total_debt is problematic.

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Solution: Use a real number value, e.g.:

$total_debt = 16000;
// ...

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Reference: Integers, Floating point numbers and for what it's worth Type Juggling.