PHP comes with a function to add 0 or digits before numbers.

This article mainly introduces PHP's own function to add 0 or pad before numbers. It has a certain reference value. Now I share it with you. Friends in need can refer to it

Many times we need Format the number, for example, if there are insufficient digits, add 0 in front of it. 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));
?>

sprintf() function
Does it feel like C language
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. Description
The parameter format is the conversion format, starting with the percent sign ("%") and ending with the conversion character. The following possible format values:

• %% - returns the percent symbol

• %b - the binary number

• %c - Character according to ASCII value

• %d - Signed decimal number

• %e - Continuous notation (For example, 1.5e 3)

• ##%u - unsigned decimal number

• %f - floating point number (local settings aware)

• %F - floating point number (not local settings aware)

• %o - octal number

• % s - string

• %x - hexadecimal number (lowercase letters)

• %X - hexadecimal number (uppercase letters) letters)

arg1, arg2, etc. parameters will be inserted into the main string at the percent sign (%) symbol. This function is executed step by step. At the first % sign, arg1 is inserted, at the second % sign, arg2, and so on.

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

3. Format number 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
?>

Related recommendations:

Complete PHP built-in functions_PHP tutorial

Simple shopping cart function in php’s built-in function

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