添加符号与PHP

Question

如何每4个字符后面加一个-：

例子：

498c665baf79ad6e - >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, '-'), '-');