Php-mysql query for non-decoded Unicode characters, fuzzy query unsuccessful

Phpsql Fuzzy Query

I am in the database Student basic information, the Student Name field is a JSON wrapped string, such as {"Stu_name": "\u5f20\u4e09"}, indicating that the student name is Zhang San. I am in the PHP program to do the student name fuzzy query, when I enter "Zhang", the background program with Json_encode to get the Unicode encoding \u5f20, and then the database fuzzy query condition is like '%\u5f20% ', this time, can return Zhang San that data, But when I input "Zhang San" two words, like '%\u5f20\u4e09% ', unexpectedly can not return. Then I tried several times, found that two percent of the middle as long as it is a Chinese character can be traced, more than one can not. In addition, a%,like '%\u5f20%\u4e09% ' is inserted between Chinese characters so that it can be queried. I use Var_dump (' \u5f20\u4e09 ') output display is 12 characters, Chinese characters should have no other characters, how is it? Ask for expert guidance.

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