Usage of PHP's built-in functions sprintf and number_format that add 0 before numbers

This article mainly introduces the usage of PHP's built-in functions sprintf and number_format, which add 0 before numbers. Interested friends can refer to it. I hope it will be helpful to everyone.

Many times we need to format numbers, such as adding 0 in front of insufficient digits. It can be easily implemented with PHP, because PHP comes with related functions.

<?php  
 //生成4位数，不足前面补0  
  $var=sprintf("%04d", 2);
  echo $var;//结果为0002  
  echo date(&#39;Y_m_d&#39;, time()).&#39;_&#39;.sprintf(&#39;d&#39;, rand(0,99));
  echo sprintf(&#39;%05s&#39;,444);//输出5为字符串，不足以0补充
?>

sprintf() function

1. Syntax

sprintf(format,arg1,arg2,arg )

Parameters	Description
format	Required. Convert format.
arg1	Required. Specifies the parameters to be inserted at the first % sign in the format string.
arg2	Optional. Specifies the parameter to be inserted into the format string at the second % sign.
arg	Optional. Specifies the parameters to be inserted into the format string at the third, fourth, etc. % symbols.

2. 说明

参数 format 是转换的格式，以百分比符号 ("%") 开始到转换字符结束。下面的可能的 format值：

•%% - 返回百分比符号
•%b - 二进制数
•%c - 依照 ASCII 值的字符
•%d - 带符号十进制数
•%e - 可续计数法（比如 1.5e+3）
•%u - 无符号十进制数
•%f - 浮点数(local settings aware)
•%F - 浮点数(not local settings aware)
•%o - 八进制数
•%s - 字符串
•%x - 十六进制数（小写字母）
•%X - 十六进制数（大写字母）

arg1, arg2, ++ 等参数将插入到主字符串中的百分号 (%) 符号处。该函数是逐步执行的。在第一个 % 符号中，插入 arg1，在第二个 % 符号处，插入 arg2，依此类推。

<?php  
$number = 123;  
$txt = sprintf("%f",$number);  
echo $txt;  
?>

3. 格式数字 number_format()

<?php  
$number = 1234.56;

// english notation (default)
$english_format_number = number_format($number);
// 1,235

// French notation
$nombre_format_francais = number_format($number, 2, &#39;,&#39;, &#39; &#39;);
// 1 234,56

$number = 1234.5678;

// english notation without thousands seperator
$english_format_number = number_format($number, 2, &#39;.&#39;, &#39;&#39;);
// 1234.57
?>

以上就是本文的全部内容，希望对大家的学习有所帮助。

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