Php transcoding solution

Php to code the data exported from oracle to mysql. the data section in oracle is displayed. Incorrectstringvalue: '\ xE6 \ xBB \ x9A \ xE5 \ x8A \ xa8... 'forcolumn' intro' atrow1. How can we implement effective encoding conversion? iconv and mb_co php convert encoding.
Import data from oracle to mysql. the data section in oracle shows the Incorrect string value: '\ xE6 \ xBB \ x9A \ xE5 \ x8A \ xa8... for column 'Intro' at row 1.
How can we implement effective encoding conversion? such iconv and mb_convert... all require character parameters. The mb_detect_encoding detection is also inaccurate. how can this problem be solved?

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What type is intro? I think iconv is very useful.
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Your data is UTF-8
What is your oracle code?
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However, \ xE6 \ xBB \ x9A \ xE5 \ x8A \ xA8 is UTF-8 encoded. ScrollTwo words

Have you set the character set for connecting to oracle?
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The encoding of both your databases is UTF-8, so you do not need to read the data before encoding and conversion.
1. is the operation page UTF-8?
2, access the oracle database, the connection character set to be set to UTF-8
3. operate the MYSQL database.