Parameters to a class constructor function - php

Question

I'm trying to adapt a class of mine that handles tags for events stored in a JSON file. You can create tags, delete them, restore them, view them, etc. In the code below for this library you can see that I retrieve the array from the file during the constructor function so I use it and manipulate it throughout my classes' functions.
class tagHandler {
private $tagsFile = "/home/thomassm/public_html/functions/php/tags.json";
private $LstTags;
private $LstReturn;
function __construct() {
$this->LstTags = array();
if(!file_exists ($this->tagsFile)){
$fHND = fopen($this->tagsFile, "w");
$tmpArray = array(array("EID","EName","EColor", "EDel"));
fwrite($fHND, json_encode($tmpArray));
fclose($fHND);
}
$encodedInput = file ($this->tagsFile);
$this->LstTags = json_decode($encodedInput[0], true);
if(!$this->LstTags) $this->LstTags = array();
}
function __destruct(){
$this->update();
}
public function update(){
$this->LstTags = array_values($this->LstTags);
$fHND = fopen($this->tagsFile, "w");
fwrite($fHND, json_encode($this->LstTags));
fclose($fHND);
//empty memory region
$this->LstTags = array();
$encodedInput = file ($this->tagsFile);
$this->LstTags = json_decode($encodedInput[0], true);
}
//More functions that use the collected array here.
I am trying to adapt the class to deal with people signed up to my events. Each event has a record in my database that will store a field for an array of males who sign up and females who sign up. I wish for the constructor class to get the arrays(s) from the record so they can be manipulated like the previous class. The issue is to get the array I have to search the DB for a record with the Event ID (EID) and that will require a variable passed to the constructor function. To make things worse, this parameter has to be able to change in a loop. For example, the page listing all the events will have to use this class in a loop going through each record, so it can retrieve the array to manipulate it and then show it in a table / fullcalendar before repeating the process to get the next event. I have put the code I have so far below. Its not complete (some variables haven't been renamed to male and female, etc) and may be completely wrong, but it will give you a base to explain from.
class signupHandler {
private $LstMaleS;
private $LstFemaleS;
private $LstReturn;
function __construct($IntEID) {
$this->LstTags = array();
$StrQuery = "SELECT MaleS, FemaleS FROM tblEvents WHERE EID = ?";
if ($statement = TF_Core::$MySQLi->DB->prepare($StrQuery)) {
$statement->bind_param('s',$IntEID);
$statement->execute ();
$results = $statement->get_result ();
}
$this->LstTags = json_decode($encodedInput[0], true);
if(!$this->LstTags) $this->LstTags = array();
}
Thanks,
Tom

Answer 1

function decodeNames($StrNames){
$this->LstNames = array();
$this->LstNames = json_decode($StrNames, true);
if(!$this->LstNames) $this->LstNames = array();
$this->LstNames = array_values($this->LstNames);
}
function update(){
$this->LstNames = array_values($this->LstNames);
return json_encode($this->LstNames);
}
public function addSignUp($StrNames, $StrUsername, $StrStatus){
$this->decodeNames($StrNames);
$BlnPresent = false;
for($i = 0; $i < count($this->LstNames); $i++){
if($this->LstNames[$i][0] == $StrUsername){
$this->LstNames[$i][1] = $StrStatus;
$BlnPresent = true;
}
}
if($BlnPresent == false){
array_push($this->LstNames, array($StrUsername, $StrStatus, date("Y-m-d H:i:s")));
}
return $this->update();
}
I have decided to pass the encoded JSON array to the class each time I call a function from it. Before every function it is decoded and turned into an array and at the end it is then re-encoded and returned back to the file calling it. Now I no longer have any constructor or destruct functions.