How to keep 2 decimal places in php and not round

How to implement PHP to retain 2 decimal places and not round: 1. Create a PHP sample file; 2. Pass "sprintf("%.2f",substr(sprintf("%.3f", $num ), 0, -2));" method retains the specified number to 2 decimal places and does not round.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to retain 2 decimal places in php and not rounding?

PHP method of retaining two decimal places and rounding or not rounding

php retaining two decimal places and rounding

$num = 123213.666666; 
echo sprintf("%.2f", $num);

php retaining two decimal places decimal place and no rounding

$num = 123213.666666; 
echo sprintf("%.2f",substr(sprintf("%.3f", $num), 0, -2));

php rounding to an integer

echo ceil(4.3); // 5 
echo ceil(9.999); // 10

php rounding method, rounding to an integer

echo floor(4.3); // 4 
echo floor(9.999); // 9

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