Configure haproxy automatically for docker open ports

docker_haproxy_auto_config.php

<?php
$list=@shell_exec('netstat -antepul | grep -i "listen" | grep "127.0.0.1:" | grep -i "docker-proxy"');
$list=explode("\n",str_replace("\r","",$list));

$ports=array();

foreach($list as $k=>$v){
	$v=trim($v);
	if(strlen($v)>0){
		while(stripos($v,'   ')!==false){
			$v=str_replace('   ',' ',$v);
		}
		while(stripos($v,'  ')!==false){
			$v=str_replace('  ',' ',$v);
		}
		$info=explode(" ",$v);
		$port=false;
		foreach($info as $k2=>$v2){
			if($port==false && stripos($v2,'127.0.0.1:')===0){
				$port=(int)substr($v2,strlen('127.0.0.1:'));
			}
		}
		if($port!==false && is_numeric($port) && $port>0 && $port<=65300){
			$ports[$port]=true;
		}
	}
}
$ports=array_keys($ports);

$plist='Ports: '.implode(', ',$ports).PHP_EOL;

$data = file_get_contents('/etc/haproxy/haproxy.header.txt');
$data.=PHP_EOL.PHP_EOL;

foreach($ports as $i=>$port){
$hash=$port.'_'.md5($port);
$data.=' 
	
frontend frontend_'.$hash.'
 bind 10.9.8.7:'.$port.'
 default_backend backend_'.$hash.'

backend backend_'.$hash.'
 mode tcp
 server local 127.0.0.1:'.$port.' check

';
}
if(is_file('/etc/haproxy/haproxy.cfg')){
  $old=file_get_contents('/etc/haproxy/haproxy.cfg');
}else{
  $old='';
}
if(trim($old)!==trim($data)){
	echo $plist.PHP_EOL;
	echo 'Writing and restarting...'.PHP_EOL;
	file_put_contents('/etc/haproxy/haproxy.cfg',$data);
	exec('systemctl restart haproxy');
	echo ' ...done'.PHP_EOL;
}