Analysis of the differences between PHP rounding functions ceil, floor, round and intval

The following is a detailed introduction to the differences between the rounding functions in PHP: ceil, floor, round, intval. Friends in need can come and refer to it

We often use PHP Rounding functions, mainly: ceil, floor, round, intval.

ceil -- further rounding
Explanation
float ceil (float value)

returns no The next integer less than value. If value has a decimal part, it is rounded up by one digit. The type returned by ceil() is still float because the range of float values ​​is usually larger than that of integer.

PHP rounding function example 1. ceil() example

< ?php echo ceil(4.3); 
// 5 echo ceil(9.999); 
// 10 
?>

floor -- rounding by rounding
Explanation
float floor (float value)

Returns the next integer not greater than value, and rounds the decimal part of value. The type returned by floor() is still float because the range of float values ​​is usually larger than that of integer.

PHP rounding function example 1. floor() example

< ?php echo floor(4.3); // 4 echo floor(9.999); // 9 ?>

round -- Round floating point numbers
Description

float round ( float val [, int precision] )

Returns the result of rounding val according to the specified precision (the number of decimal digits after the decimal point). precision can also be negative or zero (the default).

PHP rounding function example 1. round() example

< ?
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 the variable into an integer type
PHP rounding function example intval()

< ?
php echo intval(4.3); 
//4 echo intval(4.6); 
//4 
?>

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