How does php realize rounding and does not retain decimals

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The method of realizing rounding by php does not retain decimals: 1, rounding directly through intval function, discarding decimals; 2, rounding through round; 3, rounding up through ceil; 4, rounding down through floor.

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

How does php realize rounding and not keeping decimals?

There are four common methods for PHP to get an integer function:

Intval (): rounding directly, discarding decimals, keeping integers

Round (): round off

Ceil (): round up and add 1 to decimals

Floor (): round down.

Number_format (): the function formats numbers by grouping them in thousands.

Intval () integer conversion function

Int intval (mixed $var [, int $base = 10])

Returns the integer value of the variable var by using the specified decimal base conversion (default is decimal). Intval () cannot be used for object, otherwise an E_NOTICE error will be generated and 1 will be returned.

Echo intval (42); / / 42echo intval (4.2); / / 4echo intval ('42'); / / 42

Round () function

Round (number,precision,mode)

Round up floating-point numbers.

Echo round (42.12123); / / 42echo round (42.62123); / / 43echo round (42.12123, 0); / / 42echo round (42.12123, 2); / / 42.12echo round (4212123,-2); / / 421212300

One method of ceil () function

Returns the next integer not less than value, and value takes one place if it has a decimal part.

Echo ceil (42.12123) / / 43echo ceil (42.62123); / / 43

Floor () function de-tailing method

Returns the next integer not greater than value, rounding off the fractional portion of value.

Echo floor (42.12123) / / 42echo floor (42.62123); / / 42

Number_format () function

The number_format () function formats numbers by grouping thousands of bits.

Number_format (number,decimals,decimalpoint,separator)

Number: required. The number to format. If no other parameter is set, the number is formatted with no decimal point and a comma (,) as the thousand separator.

Decimals: optional. How many decimals are specified. If this parameter is set, the number is formatted with a period (.) as the decimal point.

Decimalpoint: optional. Specifies a string to use as a decimal point.

Separator: optional. Specifies the string to use as a thousand-bit delimiter. Only the first character of the parameter is used. For example, "xxx" only outputs "x".

Echo number_format ("1000000"); / / 1000000echo number_format ("1000000", 2); / / 1000000.00echo number_format ("1000000", 2, "."); / / 1.000.0000000echo number_format ("1000000", 2, "*", "."); / / 1.000.000*00echo number_format ("1000000", 2, "."); / / 1000000.00

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