如何确定字符串是否为有效的JSON? [英] How to determine whether a string is valid JSON?

问题描述

有人知道PHP的健壮(和防弹)is_JSON函数代码片段吗?我(显然)遇到一种情况，我需要知道字符串是否为JSON.

嗯，也许通过 JSONLint 请求/响应来运行它，但这似乎有些过分.

解决方案

如果您使用的是内置的 json_decode PHP函数， json_last_error 返回最后一个错误(例如 JSON_ERROR_SYNTAX (当您的字符串不是JSON时).

通常 json_decode 始终返回null.

Does anyone know of a robust (and bullet proof) is_JSON function snippet for PHP? I (obviously) have a situation where I need to know if a string is JSON or not.

Hmm, perhaps run it through a JSONLint request/response, but that seems a bit overkill.

解决方案

If you are using the built in json_decode PHP function, json_last_error returns the last error (e.g. JSON_ERROR_SYNTAX when your string wasn't JSON).

Usually json_decode returns null anyway.

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