Rounding function code in php (floor function, ceil function, round and intval)

This article mainly introduces the rounding function codes in PHP (floor function, ceil function, round and intval). It has certain reference value. Now I share it with you. Friends in need can refer to it

When dealing with floating point numbers in php, rounding is often required. There are two functions in PHP that are suitable for this situation: floor function, ceil function and round function

The combination of floor function and ceil function can make the data processed by PHP more real and reliable.

1. Let’s look at the floor function first:

Syntax:

float floor (float value)

Instructions:

Return the next integer not greater than value, and round off 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.

floor() Example 1

<?php 
 echo floor(1.6); // will output "1" 
 echo floor(-1.6); // will output "-2" 
?>

##floor() Example 2

<?php
echo(floor(0.60));
echo(floor(0.40));
echo(floor(5));
echo(floor(5.1));
echo(floor(-5.1));
echo(floor(-5.9))
?>

Output:

0
0
5
5
-6
-6

2. Ceil function:

Syntax:

float ceil (float value)

Description:

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

ceil() Example:

<?php 
echo ceil(4.3);  // 5 
echo ceil(9.999); // 10 
echo ceil(-3.14); // -3 
?>

See the difference between these two functions. .

We will often use it when paging

//Page number calculation:

  $lastpg=ceil($totle/$displaypg); //最后页，也是总页数,用ceil就方便多了。
  $lastpg=$lastpg ? $lastpg : 1; //没有显示条目，置最后页为1 
  $page=min($lastpg,$page); 
  $prepg=$page-1; //上一页 
  $nextpg=($page==$lastpg ? 0 : $page+1); //下一页 
  $firstcount=($page-1)*$displaypg;

Of course, if If you need to specify the accuracy, you need to use the round function.

3. Round function:

Syntax:

float round (float val [, int precision])

Instructions:

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 (default).

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 
?>

##4. intval—convert variables into integer types

Convert the variable to an integer type.

Syntax: int intval(mixed var, int [base]);

Return value: integer

Function type: PHP system function

Content description

This function can convert variables into integer types. The omitted parameter base is the base of the conversion, with a default value of 10. The converted variable var can be any type variable except an array or class.

Example intval()

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

Note: If intval is a character type, it will be automatically converted to 0 such as

intval('abc');

Output result 0

If it is

intval('5fd');

Output result Yes

5

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PHP rounding, rounding, round function usage

php array function sequence shuffle() and array_rand() introduction to the use of random functions

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