json_decode解码失败的原因

json_decode解码失败的原因，因为前面有三位数字，去掉就可以了。

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EDIT:Just did some quick inspection of the string provided by the OP. The small "character" in front of the curly brace is a UTF-8 B(yte) O(rder) M(ark) 0xEF 0xBB 0xBF. I don't know why this byte sequence is displayed as  here. Essentially the system you aquire the data from sends it encoded in UTF-8 with a BOM preceding the data. You should remove the first three bytes from the string before you throw it into json_decode() (a substr($string, 3) will do). string(62) "{"action":"set","user":"123123123123","status":"OK"}" ^ | This is the UTF-8 BOM As Kuroki Kaze discovered, this character surely is the reason why json_decode fails. The string in its given form is not correctly a JSON formated structure (see RFC 4627)