下面是关于数字转化的几种方法： round -- 对浮点数进行四舍五入 例子： <?php

echo round(3.4);         // 3

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(5.055, 2);    // 5.06

?>

ceil -- 进一法取整

例子：

<?php

echo ceil(4.3);    // 5

echo ceil(9.999);  // 10

?>

floor -- 舍去法取整，跟ceil刚刚相反

例子：

<?php

echo floor(4.3);   // 4

echo floor(9.999); // 9

?>

number_format -- 格式化数字为千分位

<?php

$number = 1234;

// english notation (default)

$english_format_number = number_format($number); echo "First:".$english_format_number."<br />";

// French notation

$nombre_format_francais = number_format($number, 2, ',', ' '); echo "Second:".$nombre_format_francais."<br />";

// French notation

$number = 1234.564; $nombre_format_francais = number_format($number, 2, ',', ' '); echo "Third:".$nombre_format_francais."<br />"; $number = 1234.5678;

// english notation without thousands seperator

$english_format_number = number_format($number, 2, '.', ''); echo "Forth:".$english_format_number."<br />";

?>

显示结果最终如下： First:1,234 Second:1234,00 Third:1234,56 Forth:1234.57