If url has certain code then php

Php if url contains

if(strpos($_SERVER['REQUEST_URI'], "string")) {
  ...
}

If browser url is having domain in it check using php

$url = 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];

if (!strpos($url,'mysql')) {
echo 'No mysql.'; //swapped with other echo statement
} else {
echo 'Mysql exists.';
}

If url has certain code then php

if (strpos($_SERVER['REQUEST_URI'], "url word") !== false){
// code
}

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