Phpstr_pad function usage

Today, a friend asked me how to use str_pad. he said that many of the online documents were taken directly from the manual. so I will write the details. the str_pad () function is used to fill another specified string with a string to the specified length. String str_pad (string, int pad_length, string pad_string, int pad_type );
String indicates the string, pad_length indicates the length, pad_string indicates the string to be filled (optional parameter), and pad_type indicates the filling position (optional parameter, STR_PAD_LEFT, STR_PAD_BOTH );
If pad_string and pad_type are empty, it means that pad_string is a space by default, and pad_type is automatically filled at the end of the specified string.
The code is as follows:
$ String = "test ";
Echo str_pad ($ string, 10); // produces "test ";
?>

The remaining two examples:
The code is as follows:
$ String = "test ";
Echo str_pad ($ string, 10, '+', STR_PAD_LEFT); // produces "++ test ";
?>

The code is as follows:
$ String = "test ";
Echo str_pad ($ string, 10, '+', STR_PAD_BOTH); // produces "++ test ++ ";
?>