PHP add 0 to front or back

I believe you must have encountered such a problem, because PHP is a weak type, so when sorting, sometimes very stomach pain

So here we need to unify the number of bits to handle it.

Usually adds 0 to the end to complement

Method 1: str_pad- fills the string with another string for the specified length

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

$input = ' 11111 ';

echo str_pad ( $input , 10< Span style= "color: #007700;" >, ' 0 ' , str_pad_ Left

The result of this output is:

1111100000