Hai cercato la traduzione di null da Cinese semplificato a Coreano

null
널

隱藏空白字串與 null 值
빈 문자열 및 null 값 숨기기

"null" (since php 4.2.0)
"array"

如果 不存在或者是 null，就退出命令或脚本并显示用 设置的错误消息。
이 존재하지 않거나 null이면 명령이나 스크립트를 종료하고 를 오류 메시지로 출력한다.

see the null type when a variable is considered to be null and when not.
see the null type when a variable is considered to be null and when not.

s - string (with possible null bytes) and its length
s - string (with possible null bytes) and its length

reserved : 所有保留的参数应该作为 null 传递。reserved : 所有保留的参数应该作为 null 传递。
reserved : 모든 보유 매개변수들이 null로서 전달되어야 한다.reserved : 모든 보유 매개변수들이 null로서 전달되어야 한다.

${var:+value} ： 如果 存在且不是 null，就返回 的值。
${var:+value}: 이 존재하고 null이 아니면 값을 반환한다.

(php = 4.3 only) if no parent is found, null is returned.
(php = 4.3 only) if no parent is found, null is returned.

(php = 4.3 only) if no last child is found, null is returned.
(php = 4.3 only) if no last child is found, null is returned.

(php = 4.3 only) if no first child is found, null is returned.
(php = 4.3 only) if no first child is found, null is returned.

(php = 4.3 only) if newnode already is part of a document, it will be first unlinked from its existing context. if refnode is null, then newnode will be inserted at the end of the list of children.
(php = 4.3 only) if newnode already is part of a document, it will be first unlinked from its existing context. if refnode is null, then newnode will be inserted at the end of the list of children.