PHP：忽略og删除列表末尾的空行

I have PHP script that fetches a list of IP-adresses from an URL, prepends and appends some text and linebreaks to it. This works well, except the source has an empty line at the end, and that makes a line without IP-adress. I need the script to ignore or delete that line, so that it is not generated.

<?php
$ipPage = file_get_contents('https://my.pingdom.com/probes/ipv4');
$ipList = explode("
", $ipPage);
echo "/ip firewall address-list
";
echo "remove [/ip firewall address-list find list=Pingdom]
";
foreach($ipList as $ip) {
    echo "add address=" . $ip . " list=Pingdom
";
  }
?>

You can see the result and the empty last line at https://novaram.dk/mikrotik.php

This

<?php
$ipPage = file_get_contents('https://my.pingdom.com/probes/ipv4');
$ipList = preg_split ( "
", $ipPage , -1 ,PREG_SPLIT_NO_EMPTY );
echo "/ip firewall address-list
";
echo "remove [/ip firewall address-list find list=Pingdom]
";
foreach($ipList as $ip) {
    echo "add address=" . $ip . " list=Pingdom
";
  }
?>

or this should work

<?php
$ipPage = file_get_contents('https://my.pingdom.com/probes/ipv4');
$ipList = explode("
", $ipPage);
echo "/ip firewall address-list
";
echo "remove [/ip firewall address-list find list=Pingdom]
";
foreach($ipList as $ip) {
    if(strlen(trim($ip)) != 0 )
        echo "add address=" . $ip . " list=Pingdom
";
  }
?>

Alternatively, use implode() to join them.

<?php
$ipPage = file_get_contents('https://my.pingdom.com/probes/ipv4');
$ipList = explode("
", $ipPage);
echo "/ip firewall address-list
";
echo "remove [/ip firewall address-list find list=Pingdom]
";
foreach($ipList as $ip) {
    $ips[] = "add address={$ip} list=Pingdom";
}

echo implode("
", $ips);
?>

Thank you for all your answers, I got the following to work:

<?php
$ipPage = file_get_contents('https://my.pingdom.com/probes/ipv4');
$ipPage = str_replace("'","",$ipPage);
$ipList = explode("
", $ipPage);
echo "/ip firewall address-list
";
echo "remove [/ip firewall address-list find list=Pingdom]
";
foreach($ipList as $ip) {
    if(strlen($ip) > 0) {
        echo "add address=" . $ip . " list=Pingdom
";
    }
}
?>

...but what I have a similar script, but the source sends me a list where I need to ignore the first line?