使用php从文本文件中提取非重复的电话号码

Question

I have done this code by the help of google and this website stackoverflow, thank you very much to all of you pros out there I salute all of you :)

But I have a little problem which is it prints out duplicate numbers

I have this code bellow

$link = file_get_contents("file.txt");
    if(preg_match_all('/\b[0-9]{3}\s*[-]?\s*[0-9]{3}\s*[-]?\s*[0-9]{4}\b/', $link, $content, PREG_PATTERN_ORDER)){
        $i = 0;
        if(!empty($content[0][$i])){ 
            while(!empty($content[0][$i])){
                echo "<br/>";
                echo $content[0][$i];
                $i++;
            }
        }
    }

file.txt

Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]
Name: 
Phone: [phone]

Answer 1

$link = file_get_contents("file.txt");
if(preg_match_all('/\b[0-9]{3}\s*[-]?\s*[0-9]{3}\s*[-]?\s*[0-9]{4}\b/', $link, $content, PREG_PATTERN_ORDER)){

    $content = array_unique($content[0]);
    foreach($content as $key=>$value)
    {
        echo $value;
        echo "<br>";
    }

}