Summary of PHP integer division and rounding methods

php integer division and rounding methods: 1. Use the "intval" method to convert the variable into an integer type; 2. Use the "round" method to round; 3. Use the "ceil" method to round up; 4. Use the "floor" method to round down.

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Four commonly used methods for PHP integer function:

1. Round directly, discard decimals, and keep integers: intval();

2. Rounding: round();
3. Rounding up, if there are decimals, add 1: ceil();
4. Rounding down: floor().

1. intval—convert the variable into an integer type

If intval is a character type, it will be automatically converted to 0.

intval(3.14159);  // 3
intval(3.64159);  // 3
intval('ruesin'); //0

2. Rounding: round()

Round parameter 1 according to the precision specified by parameter 2. Parameter 2 can be negative or zero (default).

round(3.14159);      // 3
round(3.64159);      // 4
round(3.64159, 0);   // 4
round(3.64159, 2);   // 3.64
round(5.64159, 3);   // 3.642
round(364159, -2);   // 364200

3. Round up and add 1 if there is a decimal: ceil()

Returns the next integer that is not less than value. If value has a decimal part, it will be rounded up by one.

This method is often used when we write paging classes to calculate the number of pages.

ceil(3.14159);  // 4
ceil(3.64159);  // 4

4. Round down: floor()

Returns the next integer that is not greater than value, and rounds the decimal part of value.

floor(3.14159);    // 3
floor(3.64159);    // 3

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