PHP 在远程网页中搜索字符串

Question

我正在尝试用 PHP 编写一个脚本，它将在其中打开一个文本文件 ./urls.txt 并检查每个域中的特定单词。我真的是 PHP 新手。

例子:在以下域中查找“Hello”一词。列表:Domain1.LTDDomain2.LTDDomain3.LTD

然后简单地打印出域名+有效/无效。

<?PHP
$link = "http://yahoo.com"; //not sure how to loop to read each line from a file.
$linkcontents = file_get_contents($link);

$needle = "Hello";
if (strpos($linkcontents, $needle) == false) {
echo "Valid";
} else {
echo "Invalid";
}
?>

Answer 1

$arrayOfLinks = array(
    "http://example.com/file.txt",
    "https://www.example-site-2.com/files/file.txt"
    );
    
    $needle = "Hello";
    
    foreach($arrayOfLinks as $link){ // loop through the array
    
        $linkcontents = file_get_contents($link);
    
        if (stripos($linkcontents , $needle) !== false) { // stripos is case-insensitive search
    // the needle exists in $linkcontents
    // !== false instead of != false since stripos can return 0 meaning the needle is the first word of the contents
        echo "Valid";
        } else {
    // the word does not exist in the given text
        echo "Invalid";
    }
}