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PHP string comparison: "" = = "" Returns false

Source: Internet
Author: User
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Judge "" = "" actually return false, the previous double quotation marks are taken from the database processing data to get to, after a double quotation mark is used to knock out the editor, the result of the comparison is false, is the problem of coding or hidden characters? Is there any better method of detection?

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Judge "" = "" actually return false, the previous double quotation marks are taken from the database processing data to get to, after a double quotation mark is used to knock out the editor, the result of the comparison is false, is the problem of coding or hidden characters? Is there any better method of detection?

"" In the middle there is a character, with Json_encode output is \ufeff

Coding problems.

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