PHP string left 0, the right side of the string 0

Overview: Items are often used to automatically populate the such as "0" on the left, right, or even middle of a string of encodings, and to develop a padded string length.

function Str_pad: The function returns the input result of being filled from the left, right, or both ends to the length of the set.

This may not be quite clear, let's look at a case:

STR_PDA (' Supplementary string ', ' the length of the string after the supplement ', ' what character to add ', ' Str_pad ... ');

Str_pad_left: Fill on the left

Str_pad_right: Fill on the right

Str_pad_both: Both sides complement

<?php$code = Str_pad (' PQ ', 11,0,str_pad_left); Echo $code;

Output Result:

(length=11)

PHP string left 0, the right side of the string 0