Getting PHP variable name as string for many variables - php

Question

I have searched through many many topics and none have helped me with my specific need as yet.
I tried many options from This Thread but none have been quite right.
I am making a config generator for switches and routers,
I am trying to streamline it, so rather than have a config array for each interface, i'll have config array for each type of layout and have the interface name as a variable.
I have the web page posting to the script and I have the page posting the port layout per post, with each interface as its own variable.
i.e.
$fa1 = "DESKTOP";
$fa2 = "VOIP";
$fa3 = "DESKTOP";
$fa4 = "";
$fa5 = "DESKTOP";
etc. I am trying to use a foreach loop to go through each interface (as such)
$ints = array($fa1,$fa2,$fa3,$fa4,etc);
foreach ($ints as $line) {
if ($line == "PC") {
file_put_contents($file, $pcarray.FILE_APPEND);
}
if ($line == "VOIP") {
file_put_contents($file,$voiparray.FILE_APPEND);
}
}
with the interface setup as an array:
$pcarray = array(
'interface ' .$interface,
'configetc'
);
I need a function to get the name of the variable for the interface so I can assign it to the $interface variable.
all the examples I've found and tried thus far dont seem compatible with like valued variables.
ie. for the above, most would return fa1 for everything that comes up DESKTOP rather than fa3 for the next desktop one.
an example of the ones that dont quite work how I want is:
function print_var_name($var) {
foreach($GLOBALS as $var_name => $value) {
if ($value === $var) {
return $var_name;
}
}
return false;
}
This one, for each variable value repetition after the first just returned the first variables name.
EDIT:
What I am wanting to get back would be:
(as the written array)
interface fa1
standard desktop config
interface fa2
standard voip config
interface fa3
standard desktop config
interface fa5
standard desktop config
where as currently im getting:
interface fa1
standard desktop config
interface fa2
standard voip config
interface fa1
standard desktop config
interface fa1
standard desktop config

Answer 1

I'm not sure if this is what your after, but in the example below, I've just created a foreach() loop to check if the array value from $ints[] is true. If so, then add variable name and value to $varArr array. So the new array would look like ["fa1" => "DESKTOP", "fa2" => "VOIP"]. You then loop through this new array and compare the value using a Switch. Note that $fa4 has been ignored on purpose but you can easily add this in if needs be and test using a default case.
$fa1 = "DESKTOP";
$fa2 = "VOIP";
$fa3 = "DESKTOP";
$fa4 = "";
$fa5 = "DESKTOP";
$ints = [$fa1,$fa2,$fa3,$fa4,$fa5];
$varArr; //Variable Name Array
foreach($GLOBALS as $k=>$v) { //Looping through Globals
if(in_array($v, $ints) && $v !== "") { //If value is in $ints array, add to this array
$varArr[$k] = $v;
}
}
foreach ($varArr as $k=>$v) { //Create Interface File
file_put_contents($file, "interface ". $k ."\n", FILE_APPEND);
switch($v) {
case "DESKTOP":
file_put_contents($file, "standard desktop config\n", FILE_APPEND);
break;
case "VOIP":
file_put_contents($file, "standard voip config\n", FILE_APPEND);
break;
}
}
Output:
interface fa1
standard desktop config
interface fa2
standard voip config
interface fa3
standard desktop config
interface fa5
standard desktop config

Answer 2

You can't get variable names the way you're trying to. You should instead pass the list of variable names to look at instead if you need to keep the var names. Then your function that generates your content will just use what you have in the array.
Something simple like this would give you both the value of your variable and its name ($varname is in the foreach loop). (I have no idea where $file, $pcarray and $voiparray come from, so they're just globals in the sample function):
$list = ["fa1", "fa2", "fa3", "fa4", "fa5"];
PutFileContentList($list);
function PutFileContentList(array $list) {
globals $file, $pcarray, $voiparray;
foreach ($list as $varname) {
$line = isset($GLOBALS[$varname]) ? $GLOBALS[$varname] : "";
if ($line == "PC") {
file_put_contents($file, $pcarray . FILE_APPEND);
}
if ($line == "VOIP") {
file_put_contents($file, $voiparray . FILE_APPEND);
}
}
}