PHP 计算两个文件的相对路径

答案

/**
 * 找出path1相对于path2的路径
 */
function getRelativePath($path1, $path2)
{
    $path1Arr = explode("/", $path1);
    $path2Arr = explode("/", $path2);
    $disMatch = 0;
    for ($i = 0; $i < count($path1Arr); $i++) {
        if ($path1Arr[$i] != $path2Arr[$i]) {
            $disMatch = count($path1Arr) - $i;
            $left = array_slice($path1Arr, $i);
            break;
        }
    }
    return str_repeat("../", $disMatch) . implode("/", $left);
}

测试代码:

$a = '/a/b/c/d/e.php';
$b = '/a/b/12/34/5.php';
echo getRelativePath($a, $b);
// 结果：../../../c/d/e.php