Concatenate a string after variable in PHP - php

Question

I want to concatenate string after variable in PHP. dot operator is not working.
foreach ($get_cont as $line)
{
#var_dump($line);
if (strpos($line, "a href"))
{
#echo "$line";
$get_core++;
if ($get_core == 3)
{
#echo $line;
break 1;
}
}
}
#echo $line;
$array = explode(' ', $line);
$core = $array[count($array) - 1];
$core = substr_replace($core, "", -1);
$cmd = "cmd /c curl http://" . $server["server_name"] . ":" . $server["port"] . "/solr" . "/" . $core . "/admin/registry.jsp";
var_dump($cmd);
The output should be like:
cmd /c curl http://server_name:8080/solr/"value of variable core"/admin/registry.jsp.
Please suggest. "." operator is not working.

Answer 1

$cmd = "cmd /c curl http://" . $server["server_name"] . ":" . $server["port"] . "/solr" . "/" . $core . "/admin/registry.jsp";
You've used double quotes for array keys in your variables and to identify your text string. You can see in the syntax highlighting that it is parsing those parts as strings rather than keys as part of your variable/array. You should either use single quotes or use curly braces to declare the variable.
Try
$cmd = "cmd /c curl http://{$server['server_name']}:{$server['port']}/solr/{$core}/admin/registry.jsp";
OR
$cmd = "cmd /c curl http://" . $server['server_name'] . ":" . $server['port'] . "/solr/" . $core . "/admin/registry.jsp";

Answer 2

You can't access super global variable $_SERVER with $server, For this you have to use $_SERVER, For accessing server name you should use $_SERVER["SERVER_NAME"] and for accessing server port you should use $_SERVER["SERVER_PORT"]
Change this to:
$cmd = "cmd /c curl http://" . $server["server_name"] . ":" . $server["port"] . "/solr" . "/" . $core . "/admin/registry.jsp";
This:
$cmd = "cmd /c curl http://" . $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . "/solr/" . $core . "/admin/registry.jsp";
Try this:
<?php
$get_cont=array("<a href='www.google.com'>");
foreach ($get_cont as $line)
{
#var_dump($line);
if (strpos($line, "a href"))
{
#echo "$line";
$get_core++;
if ($get_core == 3)
{
#echo $line;
break 1;
}
}
}
;
$array = explode(' ', $line);
$core = $array[count($array) - 1];
$core = substr_replace($core, "", -1);
echo $cmd = "cmd /c curl http://" . $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . "/solr/" . $core . "/admin/registry.jsp";

Answer 3

Below worked for me. I handled the values as string instead of storing it in array:
#echo $line;
$core="";
$core_temp="";
$core_temp=strip_tags($line);
$core=substr($core_temp, strpos($core_temp, " ") + 1);
#$array=explode(' ', $line);
#$core = $array[count($array)-1];
#$core=substr_replace($core, "", -1);
#var_dump($core);
#echo "$core";