Find string in REQUEST_URI

I need help with searching the content of the REQUEST_URI.

If $_SERVER['REQUEST_URI'] contains rmb_twi开发者_如何学Go then do something.

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This is beyond simple. Read the manual entry for strpos()

if (false !== strpos($_SERVER['REQUEST_URI'], 'rmb_twi')) {
    // do something
}

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if (strstr($_SERVER['REQUEST_URI'], 'rmb_twi')) {
   ...
}