How to compare a string value to another string value?

I have a problem in comparing a string of single word to another string within a sentence or phrase.I want to get the whole string from address if the value $Cebu have match the same word from the value of $address. My aim is if there is an exact match the return is true else false. Anyone who can help me is much appreciated.

public function address(){

    $Cebu = 'Cebu';

    $lt = '10.2638281';
    $lg = '123.60638549999999';
    $str = $lt.','.$lg;

    $url = 'http://ift.tt/WJEHSa'.trim($lt).','.trim($lg).'&sensor=false';

    $json = @file_get_contents($url);
    $data=json_decode($json);   

    $status = $data->status;
    $address = $data->results[0]->formatted_address;



    //Pinamungahan, Cebu, Philippines


}

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