PHP in front of the number 0 to get fixed-length number of two methods

Relatively basic, in fact two built-in functions can be implemented.

1 sprintf

Syntax: string sprintf (string format, mixed [args] ...);

return value: string

function Type: data processing

This function is used to format a string. Parameter format is the converted format, starting with the percent sign% to convert characters. The converted format contains the

1. Fill the blanks with characters. 0 words means blank 0. The space is the default value, which means that the space is left.
2. The Alignment method. The default value is right-aligned, and the minus table is aligned to the left.

3. Field width.

   To the minimum width.

4. Accuracy. Refers to the number of floating-point digits after the decimal point.

5. Type. See the table below

   %	Print percent symbol, do not convert.
   B	The integers are converted into binary.
   C	The integer is converted to the corresponding ASCII character.
   D	Integers are converted to 10.
   F	The number of times accuracy is converted into floating point numbers.
   O	The integer is turned into octal.
   S	The integer is converted into a string.
   X	The integer is converted to lowercase 16 rounding.
   X	Integers are converted to uppercase 16 rounding.

<?php
$number = 21365478;

$number = sprintf ("%09d", $number);

echo $number. " <br/> ";

?

>

2 Str_pad

语法：

string str_pad (string input, int pad_length [, string pad_string [, int pad_type]])

说明：

This function is padded to the left , right, or left and right edges of the string parameter input, and becomes the specified padding length.

Assume that no non-essential options are provided pad_string. The parameter input is padded with blanks , or otherwise. It will be padded to the specified length using pad_string .

non-essential option Pad_type can be str_pad_right , str_pad_left or Str_pad_both . , assuming that no pad_type is specified, it is assumed that Str_pad_right .

assuming that the value of the pad_length is negative or less than the length of the input string , it won't be padded. .

<?

Php
$input = "Alien";
Echo Str_pad ($input, 10). "                      <br/> "; Produces "Alien"
Echo Str_pad ($input, ten, "-=", str_pad_left). "  <br/> "; Produces "-=-=-alien"
Echo Str_pad ($input, Ten, "_", Str_pad_both). "   <br/> "; Produces "__alien___"
Echo Str_pad ($input, 6, "___"). " <br/> ";

?>

PHP in front of the number 0 to get fixed-length number of two methods