How to implement php rounding to two decimal places

How to implement PHP rounding to two decimal places: First create a PHP sample file; then pass "sprintf("%.2f", $num);" or "round($num,2);" The method implements rounding and retains two decimal places.

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php rounds to two decimal places and automatically completes 0

It is very simple for php to round to two decimal places

Method one, (automatically complete 0)

echo sprintf("%.2f", $num);

Method two, (not complete 0)

echo round($num,2);

Recently, the project has encountered a problem. Method 1 is not good at rounding.

For example,

$num =1.785;  
echo sprintf("%.2f", $num);
//结果1.78

It can be seen that the numbers are not rounded

Then the ultimate solution appears

echo sprintf("%.2f", round($n,2));

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