Php format number: add 0 to complement the number before the number of digits is insufficient

Source: Internet
Author: User
The format parameter is the conversion format. it starts with the percent sign (& quot ;%& quot;) and ends with the conversion character. The following possible format values:

Php format number: add 0 to complement the number before the number of digits is insufficient

Instance first, and then explain

 

PHP code
  1. $ Var = sprintf ("% 04d", 2); // Generate four digits. if not, add 0.
  2. Echo $ var; // result 0002
  3. ?>

PHP string sprintf () function

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


Parameters Description
Format Required. Conversion format.
Arg1 Required. Specifies the parameter inserted at the first % symbol in the format string.
Arg2 Optional. Specifies the parameter inserted at the second % symbol in the format string.
Arg ++ Optional. Specifies the parameters inserted to the third, fourth, and other % symbols in the format string.


Description

ParametersFormatIs the conversion format, starting from the percent sign ("%") to the end of the conversion character. PossibleFormatValue:

  • %-Percentage sign returned
  • % B-binary number
  • % C-characters based on ASCII values
  • % D-signed decimal number
  • % E-resumable counting (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 values
  • % S-string
  • % X-hexadecimal (lowercase letter)
  • % X-hexadecimal (uppercase letters)

Parameters such as arg1, arg2, ++ are inserted to the percent sign (%) in the main string. This function is executed step by step. In the first % symbol, insert arg1, at the second % symbol, insert arg2, and so on.

 

PHP code
  1. $ Number = 123;
  2. $ Txt = sprintf ("% f", $ number );
  3. Echo $ txt;
  4. ?>

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