如何使用php回显文本区域中的特定行

Question

I am collecting html text area data to echo in php.I am able to select all data using

$devices = explode("
", $_POST['devs']);
foreach($devices as $device)
echo $device;

and I am able to select only the first line using:

$first_line = strstr(($_POST['devs']), "
", true);
echo $first_line;

But How can I echo specific lines ? say line 2 or 4 from text area ?

Answer 1

Usage:

getLines(YOUR POST, START LINE, END LINE(optional));

With return array:

function getLines($text, $start, $end = false)
{
    $devices = explode("
", $text);
    $append  = "My device is ";

    $output = array();
    foreach ($devices as $key => $line)
    {
        if ($key+1 < $start) continue;
        if ($end && $key+1 > $end) break;
        $output[] = $append.$line;
    }
    return $output;
}

$array = getLines($_POST['devs'], 2);
var_dump($array);

With echo string:

function getLines($text, $start, $end = false)
{
    $devices = explode("
", $text);
    $append  = "My device is ";

    $output = "";
    foreach ($devices as $key => $line)
    {
        if ($key+1 < $start) continue;
        if ($end && $key+1 > $end) break;
        $output .= $append.$line."<br />";
    }
    return $output;
}

echo getLines($_POST['devs'], 2);