PHP returns JSON exception

json_encode($rst)An unknown character appears before the JSON returned by the function ���{"status":"ok"}
Causes parsing to fail and how to handle it?

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json_encode($rst)An unknown character appears before the JSON returned by the function���{"status":"ok"}
Causes parsing to fail and how to handle it?

Because the problem is not necessarily the current PHP document, may be a previous document accumulated, inconvenient to troubleshoot, so you can use before output to ob_clean(); clear the previous output cache.

Supplement: Can be through "Grep-rli $ ' \xef\xbb\xbf '." Globally finds files with BOM encoding.

The PHP file is encoded

Set the file encoding

PHP's JSON processing function only supports UTF8 encoding for Chinese characters.

Change the file encoding format of the output JSON to UTF8 no BOM

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