问检查和替换字符串PHP中的双表达式

EN

$x = "i love you/i love her/you love me/you love me";
$strArr = explode("/",$x);
$temp = array();
foreach($strArr as $value){
    if(in_array($value,$temp)){
       $result[]=str_replace(" ","--",$value);    
    }else{
       $result[]=str_replace(" ","-",$value);
    }
    $temp[] = $value;
}
echo implode("/",$result);

function format_string($x)  
{
    //trim whitespace to avoid "-" at beginning and end 
    $x = str_replace(" ","-",trim($x));
    // create an array of each entry 
    $entries = explode("/", $x);
    //count each entry 
    $entry_counts = array_count_values($entries);

    foreach($entry_counts as $string => $count){
        if($count == 2){
            $needs_updating = $string;  
        }
    }

    if(isset($needs_updating)){
        foreach($entries as $index => &$entry){
            if($entry == $needs_updating){
                $entries[$index] = str_replace("-", "--",$entry);
            }
        }

        return implode("/", $entries); 
     }

    return implode("/", $entries); 

}

$pattern = '/(?<=^|\/).+?(?=\/|$)/';
$phrases = [];
$y = preg_replace_callback($pattern, function($phrase) use (&$phrases) {
    $separator = in_array($phrase[0], $phrases) ? '--' : '-';
    $phrases[] = $phrase[0];
    return str_replace(' ', $separator, $phrase[0]);
}, trim($x));