strtr function number character substitution garbled

strtr function numeric character substitution garbled
My replacement thesaurus comes from a text file. Text files either changed to GBK or the utf-8 format are garbled.
If you define the replacement thesaurus yourself as follows:
$words = Array (' say ' = ' dddddddddddddddddddd ');
Replace will not garbled
$data [' content '] = STRTR ($data [' content '], $words);

I print out the words variable, the phrase inside is not garbled, with function detection, is not utf-8 format. So you can confirm that both the content and the replacement phrase are GBK formatted strings.
How can i solve this problem? Thank you

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The format of your thesaurus? How do you read the thesaurus?

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