In this article we introduced four commonly used rounding and rounding functions in php, ceil, floor, round, intval. Let’s introduce them in detail below.
1.ceil: rounding to the nearest integer
Explanation
float ceil (float value)
Returns the next integer that is not less than value, if value has decimals Partially advances one digit. The type returned by ceil() is still float because the range of float values is usually larger than that of integer.
Example 1. ceil() example
<?php echo ceil(4.3); // 5 echo ceil(9.999); // 10 ?>
We will often use it when paging
//Page number calculation:
$lastpg=ceil($totle/$displaypg); //最后页,也是总页数 $lastpg=$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;
2.floor: Rounding by rounding method
Explanation
float floor (float value)
Returns the next integer that is 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.
Example 1. floor() example
Example
In this example, we will apply the floor() function to different numbers:
<?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
3.round: Round floating point numbers
Description
float round (float val [, int precision])
Returns val according to the specified precision (the number of decimal digits after the decimal point) rounded. precision can also be negative or zero (default).
Note: PHP cannot handle strings like "12,300.2" correctly by default.
Note: The prec parameter was introduced in PHP 4. .
Example
<?php echo(round(0.60)); echo(round(0.50)); echo(round(0.49)); echo(round(-4.40)); echo(round(-4.60)); ?>
Output:
1 1 0 -4 -5
4.intval: Convert variables into integer types
Convert variables into 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. For example,
intval('abc');
output the result
0
If it is
intval('5fd');
the output result is
5
5.What is the difference between the ceil function and the intval function in php?
ceil is rounded to the nearest integer, intval gets the integer value of the variable
ceil(3.33)=4; intval(3.33)=3; ceil(3.9)=4; intval(3.9)=3;
Related articles:
php data processing rounding, rounding
3 ways to implement rounding in PHP
Summary of methods for rounding and intercepting floating-point strings in PHP

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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