PHP实现数据四舍五入的方法小结【4种方法】

<?php
//定义一个float型的变量
$number = 1234.5678;
//English Notation (defult)
$number_format_english = number_format($number);
//1,235
$number_format_english = number_format($number, 2, '.', '');
//1234.57
//French Notation
$number_format_francais = number_format($number, 2, ',', '');
//1234,57
$number_format_francais = number_format($number, 3, ',', '');
//1234,568
echo $number_format_english;
//1234.57
echo $number_format_francais;
//1234,568

<?php
//定义一个float型的变量
$number = 1234.5678;
//不保留小数
echo round($number);
//1235
//保留两位小树
echo round($number,2);
//1234.57
echo "<br>";
$number = 12345678;
//在千分位进行四舍五入
echo round($number,-4);
//12350000

<?php
//定义一个正整数
$n = 43951789;
//定义一个负整数
$u = -43951789;
// ASCII 65 is 'A'
$c = 65; 
printf("%%b = '%b'\n", $n); 
//%b = '10100111101010011010101101'
printf("%%c = '%c'\n", $c); 
//%c = 'A' 
printf("%%d = '%d'\n", $n); 
//%d = '43951789' 
printf("%%e = '%e'\n", $n); 
//%e = '4.395179e+7' 
printf("%%u = '%u'\n", $n); 
//%u = '43951789' 
printf("%%u = '%u'\n", $u); 
//%u = '4251015507' 
printf("%%f = '%f'\n", $n); 
//%f = '43951789.000000' 
printf("%%o = '%o'\n", $n); 
//%o = '247523255' 
printf("%%s = '%s'\n", $n); 
//%s = '43951789' 
printf("%%x = '%x'\n", $n); 
//%x = '29ea6ad' 
printf("%%X = '%X'\n", $n); 
//%X = '29EA6AD' 
printf("%%+d = '%+d'\n", $n); 
//%+d = '+43951789' 
printf("%%+d = '%+d'\n", $u); 
//%+d = '-43951789'

<?php
//定义一个浮点数
$number = 1234.5678;
$number_int = intval($number);
echo $number_int;
//1234