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关于,对不足8位的在后面补二进制的0
我也加一个
str_pad
(PHP 4 >;= 4.0.1)
str_pad -- Pad a string to a certain length with another string
Description
string str_pad ( string input, int pad_length [, string pad_string [, int pad_type]])
This functions returns the input string padded on the left, the right, or both sides to the specified padding length. If the optional argument pad_string is not supplied, the input is padded with spaces, otherwise it is padded with characters from pad_string up to the limit.
Optional argument pad_type can be STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH. If pad_type is not specified it is assumed to be STR_PAD_RIGHT.
If the value of pad_length is negative or less than the length of the input string, no padding takes place.
例子 1. str_pad() example
- <?php
- $input = "Alien";
- echo str_pad($input, 10); // produces "Alien "
- echo str_pad($input, 10, "-=", STR_PAD_LEFT); // produces "-=-=-Alien"
- echo str_pad($input, 10, "_", STR_PAD_BOTH); // produces "__Alien___"
- echo str_pad($input, 6 , "___"); // produces "Alien_"
- ?>;
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注: The pad_string may be truncated if the required number of padding characters can't be evenly divided by the pad_string's length.
手册上都有 |
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