<?php
$resp = "/fl=123&gh=word&more=params";
$fl=$matches[1] . PHP_EOL;
echo $fl;
}
if (preg_match('/fl=([^&]+)/', $resp, $matches)) { $fl=$matches[1];
echo $fl;
}
PD9waHAKCiAgICAkcmVzcCA9ICIvZmw9MTIzJmdoPXdvcmQmbW9yZT1wYXJhbXMiOwogICAgaWYgKHByZWdfbWF0Y2goJy9mbD0oLio/KSYvJywgJHJlc3AsICRtYXRjaGVzKSkgewogICAgICAgICRmbD0kbWF0Y2hlc1sxXSAuIFBIUF9FT0w7CiAgICAgICAgZWNobyAkZmw7CiAgICAgICB9CiAgICAgICAKICAgIGlmIChwcmVnX21hdGNoKCcvZmw9KFteJl0rKS8nLCAkcmVzcCwgJG1hdGNoZXMpKSB7CiAgICAgICAgJGZsPSRtYXRjaGVzWzFdOwogICAgICAgIGVjaG8gJGZsOwogICAgICAgfQ==