How can the use of quotation marks around variables like "$mod_ma_res_a" impact the expected results in PHP calculations?

Using quotation marks around variables like "$mod_ma_res_a" in PHP calculations will treat the variable as a string literal rather than a variable holding a numeric value. This can lead to unexpected results or errors in calculations. To resolve this issue, simply remove the quotation marks around the variable when performing arithmetic operations. 

$mod_ma_res_a = 10;
$mod_ma_res_b = 5;

// Incorrect usage with quotation marks
$result = "$mod_ma_res_a" + $mod_ma_res_b; // This will concatenate the strings instead of adding the numbers

// Correct usage without quotation marks
$result = $mod_ma_res_a + $mod_ma_res_b; // This will correctly add the numbers

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quotation marks variables PHP calculations impact expected results

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