用PHP添加符号

Question

如何在每4个字符后添加-：

示例：

498c665baf79ad6e - ＆gt; 498c-665b-af79-ad6e

Answer 1

echo implode('-', str_split('498c665baf79ad6e', 4));

Answer 2

<?php

$source = "...";

$hypenated = array();

for ($i = 0; $i < strlen($source)/4; $i++) {
    $hypenated[] = substr($source, $i*4, 4);
}

$hypenated = implode('-', $hypenated);

Answer 3

$s = '498c665baf79ad6e';
echo preg_replace ('/(.{4})(?=.)/', '\1-', $s);

Answer 4

或者：

<?php
echo rtrim(chunk_split('498c665baf79ad6e', 4, '-'), '-');