What potential issues or errors can arise when working with numbers and commas in PHP?

When working with numbers and commas in PHP, a common issue is that PHP may interpret commas as string literals instead of numerical values, leading to unexpected results in calculations or comparisons. To solve this issue, you can use PHP's built-in functions like `str_replace()` to remove commas from numbers before performing any mathematical operations. 

// Remove commas from a number before using it in calculations
$number = "1,000";
$number = str_replace(',', '', $number);
$result = $number * 2;

echo $result;

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