The difference between PHP's rounding function ceil,floor,round,intval

Ceil-into one method to take the whole

float ceil (float $value)

Returns the next integer not less than value, in which value is entered if there is a fractional part. The type returned by Ceil () is still float, because the range of float values is usually larger than the integer.

floor-and rounding out the whole process

Float Floor (float $value)

Returns the next integer not less than value, rounding out the fractional part of value. The type returned by floor () is still float, because the range of float values is usually larger than the integer.

Round-rounding of floating-point numbers

Float round (float $val [, int $precision])

Returns the result of rounding Val based on the specified precision precision (number of digits after decimal point). Precision can also be negative or 0 (the default value).

Attention:

1. PHP does not correctly handle strings similar to "12,300.2″" by default. 2, the precision parameter is introduced in PHP 4.

intval-gets the integer value of the variable

int intval (mixed $var [, int $base])

Returns the integer value of the variable var by using a specific binary conversion (by default, decimal). var can be any scalar type. Intval () cannot be used with an array or object.

Attention:

1. Returns the integer value of the variable var by using the specified binary base conversion (default is decimal). Intval () cannot be used with object, otherwise a e_notice error is generated and 1 is returned.

2, if base is 0, by detecting the format of Var to determine the use of the system:

If the string includes a prefix of "0x" (or "0X"), use 16 binary (hex); otherwise, 10 decimal is used.

The difference between PHP's rounding function ceil,floor,round,intval