PHP rounding, rounding round rounding, rounding up, rounding down, fractional interception

PHP takes integer functions commonly used in four ways:

1. Direct rounding, discarding decimals, preserving integers: intval ();
2 Rounding and Rounding: round ();
3. Rounding up, there are decimals on the addition of 1:ceil ();
4. Rounding Down: Floor ().

First, intval-the variable into an integer form
Intval if it is a character type, it is automatically converted to 0.

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

Second, rounding: round ()

The parameter 1 is rounded according to the specified precision of parameter 2. The parameter 2 can be a negative number or 0 (the 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

Three, upward rounding, there are decimals on the addition of 1:ceil ()

Returns the next integer not less than value, in which value is entered if there is a fractional part.

This method is often used when we are writing pagination classes to calculate page counts.

Ceil (3.14159);  // 4 Ceil (3.64159);  // 4

Four, downward rounding: Floor ()

Returns the next integer not less than value, rounding out the fractional part of value.

 Floor (3.14159);    // 3  Floor (3.64159);    // 3

PHP rounding, rounding round rounding, rounding up, rounding down, fractional interception