PHP's own function to add 0 before numbers_PHP Tutorial

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('Y_m_d', time()).'_'.sprintf('d', rand(0,99));
?> 

sprintf() function

1. Grammar

sprintf(format,arg1,arg2,arg++)

参数	描述
format	必需。转换格式。
arg1	必需。规定插到 format 字符串中第一个 % 符号处的参数。
arg2	可选。规定插到 format 字符串中第二个 % 符号处的参数。
arg++	可选。规定插到 format 字符串中第三、四等等 % 符号处的参数。

2. Description

The parameter format is the format of the conversion, starting with the percent sign ("%") and ending with the conversion character. Possible format values ​​below:

• %% - Returns the percent symbol
• %b - binary number
• %c - character
according to ASCII value
• %d - signed decimal number
• %e - Continuous counting method (e.g. 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 (capital letters)

Arguments such as arg1, arg2, ++ etc. 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, ',', ' ');
// 1 234,56

$number = 1234.5678;

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

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