The realization of the function of the digital zero-complement in PHP

There are at least two functions in PHP that can help us quickly achieve digital 0:

The first is the PHP str_pad function:

The code is as follows:

#str_pad-Fills a string with another string for a specified length
As the name suggests, this function is for strings, filling any other string with the specified string

Str_pad parameter Description:

The code is as follows:

String Str_pad (string $input, int $pad _length [, string $pad _string = "" [, int $pad _type = str_pad_right]])
#常用参数说明: Str_pad (with filled string, filling length, filling string, filling position)
The length must be a positive integer, filling position has three options,
Left: Str_pad_left
Right: Str_pad_right
Both ends: Str_pad_both
Example Show:

The code is as follows:
Echo Str_pad (1,8, "0", str_pad_left);
#结果: 00000001
Echo Str_pad (1,8, "0", str_pad_right);
#结果: 10000000
Echo Str_pad (1,8, "0", Str_pad_both);
#结果: 00010000
$pad =str_pad (($number [0]["Count (*)"]+1), 4, "0", str_pad_left); Auto Fill 0

One notable detail in the above example is that if the number of digits that are filled is odd, for example three to fill 7 0, the right is preferred.

Here's another way to make a zero:

The

sprintf () function
does not feel much like the C language
1. Syntax
sprintf (format,arg1,arg2,arg++)
parameter   description
format  required. Conversion format.
arg1  required. Specify the parameter to be inserted into the first% symbol in the format string.
arg2  Optional. Specify the parameter to be inserted into the second% symbol in the format string.
arg++  Optional. Specify the parameters to be inserted into the format string at the third to fourth and so% symbols. The
2. Description
Parameter format is the format of the transformation, starting with the percent sign ("%") to the end of the conversion character. The following possible format values:
percent%-return symbol
%b-binary
%c-characters by ASCII value
%d-Signed decimal
%e-Renewable count (for example, 1.5e+3)
%u- unsigned decimal digits
%f-floating-point numbers (Local settings Aware)
%f-floating-point number (not local settings aware)
%o-eight number
%s-string
%x-16 in Number (lowercase)
%x-16 (uppercase)
Arg1, arg2, + + etc parameters will be inserted into the main string in percent (%) Symbol Place. The function is executed incrementally. In the first% symbol, insert arg1, at the second% symbol, insert arg2, and so on.
<?php  
$number = 123;  
$txt = sprintf ("%f", $number);  
Echo $txt; &n bsp; 
?>
3. Format number Number_format ()
<?php  
$number = 1234.56;

中文版 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;

中文版 notation without thousands seperator
$english _format_number = Number_format ($number, 2, '. ', ');
1234.57
?>