下面是一个通过PHP递归函数实现权限树检查的示例代码：
<?php// 定义权限树结构$permissions = array( 'user' => array( 'create' => true, 'read' => true, 'update' => true, 'delete' => true ), 'post' => array( 'create' => true, 'read' => true, 'update' => false, 'delete' => false ), 'comment' => array( 'create' => true, 'read' => true, 'update' => false, 'delete' => false ));// 定义用户权限$userPermissions = array( 'user' => array( 'create' => true, 'read' => true, 'update' => true, 'delete' => false ), 'post' => array( 'create' => true, 'read' => true, 'update' => false, 'delete' => false ));// 递归检查权限function checkPermission($permissions, $userPermissions){ foreach ($permissions as $key => $value) { if (is_array($value)) { checkPermission($value, $userPermissions[$key]); } else { if ($value !== $userPermissions[$key]) { echo "权限不足：$key/$value\n"; } } }}// 检查权限checkPermission($permissions, $userPermissions);?>在这个示例中，我们首先定义了一个权限树结构 $permissions 和一个用户权限 $userPermissions。然后定义了一个递归函数 checkPermission 来逐层检查权限树和用户权限是否匹配。最后调用 checkPermission 函数来检查权限。如果权限不匹配，则输出提示信息。
请根据实际情况调整权限树和用户权限，并根据需要修改递归函数中的逻辑。
