Why doesn't php round to the nearest whole number?

php method of rounding without rounding: 1. Use the ceil() method to achieve further rounding; 2. Use the floor() method to achieve rounding to an integer.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

Why doesn’t php round up?

php rounding method

The code is as follows:

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

php rounding method, rounding up an integer

The code is as follows:

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

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