Summary of four common methods for using integer functions in PHP

Ceil-integer in one method
Description
Float ceil (float value)
Returns the next integer of no less than value. If the value has a decimal part, it is entered in one place. The type returned by ceil () is still float, because the float value range is usually larger than integer.
Example 1. ceil () Example
Copy codeThe Code is as follows:
<? Php
Echo ceil (4.3); // 5
Echo ceil (9.999); // 10
?>

Floor-rounding
Description
Float floor (float value)
Returns the next integer not greater than value and rounds the decimal part of value. The return type of floor () is still float, because the float value range is usually larger than that of integer.
Example 1. floor () Example
Copy codeThe Code is as follows:
<? Php
Echo floor (4.3); // 4
Echo floor (9.999); // 9
?>

Round-rounding floating point numbers
Description
Float round (float val [, int precision])
Returns the result of rounding val by the specified precision (number of digits after decimal point. Precision can also be negative or zero (default ).
Example 1. round () Example
Copy codeThe Code is as follows:
<? Php
Echo round (3.4); // 3
Echo round (3.5); // 4
Echo round (3.6); // 4
Echo round (3.6, 0); // 4
Echo round (1.95583, 2); // 1.96
Echo round (1241757,-3); // 1242000
Echo round (5.045, 2); // 5.05
Echo round (5.055, 2); // 5.06
?>

Intval-convert a variable to an integer type
Example intval ()
Copy codeThe Code is as follows:
<? Php
Echo intval (4.3); // 4
Echo intval (4.6); // 4
?>