Php uses str_pad to automatically add 0 digits if the card number is insufficient

This article mainly introduces php's method of auto-complementing 0 when the card number is not enough based on str_pad, which is very useful for generating fixed-digit numbers, if you need it, you can refer to the str_pad function in php to automatically fill up the white space. the str_pad () function can help us implement it. the str_pad () function fills the string with the specified length.

The str_pad () function fills the string with the specified length.
Syntax
Str_pad (string, length, pad_string, pad_type)

Parameters	Description
String	Required. Specifies the string to be filled.
Length	Required. Specify the length of the new string. If the value is smaller than the length of the original string, no operation is performed.
Pad_string	Optional. The specified string for filling. The default value is blank.
Pad_type	Optional. Specify the other side of the string to be filled. Possible values: STR_PAD_BOTH-fill in the two ends of the string. If it is not an even number, the right side will receive additional filling. STR_PAD_LEFT-fill in the left side of the string. STR_PAD_RIGHT-fill in the string to the right. This is the default one.

Example:

The code is as follows:

$ CardCount = 10;
$ Arr = array ();
For ($ I = 1; $ I <= $ cardCount; $ I ++ ){
$ StrCard = str_pad ($ I, 10, '0', STR_PAD_LEFT );
$ Arr [] = $ strCard;
}
Print_r ($ arr );

The output result is as follows:

The code is as follows:

Array ([0] => 0000000001 [1] => 0000000002 [2] => 0000000003 [3] => 0000000004 [4] => 0000000005 [5] => 0000000006 [6] => 0000000007 [7] => 0000000008 [8] => 0000000009 [9] => 0000000010)

I hope this article will help you with PHP programming.