[SOLVED] Pass by reference in PHP?

[proxximo]

I have a question regarding functions returning value to other functions in php. Up until now I just make everything happen in one function, but I am finding more and more that I will need to do the same thing 5 times and rather than having the same code five times in my function i figured i would just write a function for that process and pass the value back to the original location. So here is my question, how in the world do you do that in php.

 

In C++ to pass by reference you have something like:

 

int main() {
   passReference(int & value1, int & value2);
   return 0;
}
void passReference(int & value1, int & value2) {
    .....processes here
}

 

Is this done the same way in php? what would the basic outline of a reference function look like. Use my example above and I should be able to figure it out from there. Thanks a ton!

 

Proxximo

[MadTechie]

The OOP section is better suited for this.. as with C++ you can use pointers in PHP,

 

example

 

in PHP

<?php
/* REVERSE.PHP */

$str = ""; /* Buffer to hold reverse string */

reverse("cat", &$str); /* Reverse the string "cat" */
printf("reverse (\"cat\") = %s\n", $str); /* Display result */
reverse("noon", &$str); /* Reverse the string "noon" */
printf("reverse (\"noon\") = %s\n", $str); /* Display result */

function reverse($before, $after) {
$after=$before; /* Expand $str to length, preventing array */
$len = strlen($before);
for ($j=$len-1, $i=0; $j>=0; $j--, $i++)
$after{$i} = $before{$j};
}
?>

 

in C

/* REVERSE.C */

#include <stdio.h>

/* Function Prototype */
reverse ();

main () {
char str [100]; // Buffer to hold reverse string

reverse("cat", str); // Reverse the string "cat"
printf("reverse (\"cat\") = %s\n", str); // Display
reverse("noon", str); // Reverse the string "noon"
printf("reverse (\"noon\") = %s\n", str); // Display
}

reverse (before, after)
char *before; // A pointer to the source string
char *after; // A pointer to the reversed string
{
int i;
int j;
int len;

len = strlen (before);

for (j = len - 1, i = 0; j >= 0; j--, i++) // reverse loop
after[i] = before[j];
after[len] = NULL // NULL terminate reversed string
}

[proxximo]

My problem to this point is I am running a function that is supposed to pull a string value from a separate function, to use later. I also use an index for all of my functions called index.php .

 

The error I am getting is "Table does not exist"

 

From what I can see the monsterDatabase function is not sending any value back or sending a blank value.  The script tests fine when the code from monsterDatabase is put right above the doquery function, however I am wanting to write it as its own function, since I have that piece of script (500 lines long) written 4 other times in the same script.

 

I tried searching for a solution via the web but only come up empty handed. Any help would be greatly appreciated.

 

Here is the code in the index.php script

 

elseif ($do[0] == "monsterDatabase") { include('fight.php'); monsterDatabase(&$monsterdb); }

 

The main function that is calling for the value is called fight()

 

function fight() {

   if ($userrow["currentfight"] == 1) {
   
     $newmonsterdb = monsterDatabase(&$monsterdb);

     $monsterquery = doquery("SELECT * FROM {{table}} ORDER BY RAND() LIMIT 1", $newmonsterdb);
     //The doquery function is working fine, tests great when I just post the script from monsterDatabase          
     //above it
}

}

 

The function that is supposed to return the value is obviously monsterDatabase and looks like this (shortened from 500 lines down to just make the point)

 

function monsterdatabase(&$monsterdb){

   if ($userrow["currentarea"] == "Outside Proxximos Fortress") {
		$monsterdb = "monsterproxximos";
   } elseif ($userrow["currentarea"] == "Training Grounds") {
		$monsterdb = "townmonster2";
   } elseif ($userrow["currentarea"] == "Outside Oasis of Otium") {
		$monsterdb = "townmonsteroasis";
   } elseif ($userrow["currentarea"] == "Outside Skyfall Peak") {
		$monsterdb = "townmonsterskyfall";
   } elseif ($userrow["currentarea"] == "Outside Aloren") {
		$monsterdb = "townmonsteraloren";
   }

   return $monsterdb;

}

 

If any more information is needed please do not hesitate to respond and I will get it up as quickly as possible. Thanks

 

Proxximo

[MadTechie]

Sorry for last responce, been busy..

 

ok just want to point somethin out

 

$newmonsterdb = monsterDatabase(&$monsterdb);

passes nothing as $monsterdb isn't set..

 

also

 

function monsterdatabase(&$monsterdb){

   if ($userrow["currentarea"] == "Outside Proxximos Fortress") {

$userrow["currentarea"]

isn't set either it should be

$monsterdb["currentarea"]

as that was passed

[proxximo]

$userrow is a global variable, should I set it outside the functions like

 

<?php 
global $userrow

fight(){
}

monsterDatabase() {

}

?>

[proxximo]

I figured it out!

 

Needed to have the global variables added into each function like:

 

<?php
function fight() {
  global $userrow;

   if ($userrow["currentfight"] == 1){
         $monsterdb = "";
         $monsterdb = getDatabase(monsterdb);
   }
}

function getDatabase(&$monsterdb) {
  global $userrow;
    process .......
  return monsterdb;

}

?>

 

 

Works great now, thanks to all that helped me along