ngx.shared.DICT.safe_set ------------------------ **语法:** *ok, err = ngx.shared.DICT:safe_set(key, value, exptime?, flags?)* **环境:** *init_by_lua*\**, set_by_lua*\**, rewrite_by_lua*\**, access_by_lua*\**, content_by_lua*\**, header_filter_by_lua*\**, body_filter_by_lua*\**, log_by_lua*\**, ngx.timer.*\* 类似 [set](#ngxshareddictset) 方法，但当共享内存区块存储空间不足时，不覆盖 (最近最少使用的) 有效的项 (非过期项)。此时，它将返回 `nil` 和字符串 "no memory" (内存不足)。 此方法最早出现在 `0.7.18` 版本中。 更多功能请参考 [ngx.shared.DICT](#ngxshareddict)。 > English Source **syntax:** *ok, err = ngx.shared.DICT:safe_set(key, value, exptime?, flags?)* **context:** *init_by_lua*\**, set_by_lua*\**, rewrite_by_lua*\**, access_by_lua*\**, content_by_lua*\**, header_filter_by_lua*\**, body_filter_by_lua*\**, log_by_lua*\**, ngx.timer.*\* Similar to the [set](#ngxshareddictset) method, but never overrides the (least recently used) unexpired items in the store when running out of storage in the shared memory zone. In this case, it will immediately return `nil` and the string "no memory". This feature was first introduced in the `v0.7.18` release. See also [ngx.shared.DICT](#ngxshareddict). [返回目录](#nginx-api-for-lua)