How to calculate relative paths of two files in php

This article mainly introduces the method of calculating the relative path of two files in PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

<?php
/**
 * 计算两个文件的相对路径
 */
function relative_path($path1, $path2)
{
    $arr1 = explode(&#39;/&#39;, dirname($path1));
    $arr2 = explode(&#39;/&#39;, dirname($path2));
    for ($i = 0, $len = count($arr2); $i < $len; $i++) {
        if ($arr1[$i] != $arr2[$i]) {
            break;
        }
    }
    //不在用一个根目录下面
    if ($i == 1) {
        $return_path = array();
    }
    //在同一个根目录下
    if ($i != 1 && $i < $len) {
        $return_path = array_fill(0, $len - $i, "..");
    }
    #在同一个目录下
    if ($i == $len) {
        $return_path = array("./");
    }
    $return_path = array_merge($return_path, array_slice($arr1, $i));
    return implode(&#39;/&#39;, $return_path);
}
//测试一下
$a = &#39;/a/b/c/d/e.php&#39;;
$b = &#39;/a/b/12/34/c.php&#39;;
echo relative_path($a, $b);

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