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holt alle Links von einer website

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    # Variablenuebernahme:
    $url = $_POST['url'];
    # Fehlerbehandlung bei leerer Eingabe:
    $error = "";
    if (empty($url))
        $error .= "Bitte eine URL eingeben!";
    if ($error!="")
        echo "<p style=\"color:red\">$error</p>";
        #echo "<p>$url</p>";
        # Wandelt den URL-Inhalt in einen String $text um:
        $text = file_get_contents($url);
        #echo $text;
        # Filtert alle Hyperlinks aus $text heraus und steckt sie als Array in den Array $links:
        # Da der Array der Hyperlinks der erste Eintrag des Arrays $links ist,
        # wird $links zu seinem ersten Eintrag gemacht:
        $links = $links[0];
                # Gibt die Hyperlinks in einer HTML-Liste aus:
        echo "Hier sind alle Links aus $url: <br/><ul>";
            echo "<li>$links[$i]</li>";
        echo "</ul>";

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