PHP rounding, rounding round rounding, rounding up, rounding down, fractional intercept round is what meaning rounding is an billion Excel value four five

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);  // 3intval(3.64159);  // 3intval('ruesin')//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);      // 3round(3.64159);      // 4round(3.641590);   // 4round(3.641592);   // 3.64round(5.641593);   // 3.642round(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);  // 4ceil(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);    // 3floor(3.64159);    // 3

Reprint Please specify source: http://blog.csdn.net/churk2012/article/details/51424588

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