Convert only matching keys from an array into object properties that match - php

Question

I am trying to convert only matching keys from an associative array into object properties that match them. The code I have below gives an error of Unidentified variable : key on this line if(array_key_exists($array[$key], $classprop)){.
<?php
class assoctoprop {
public $fname;
public $lname;
public $email;
public function assign(){
$array = array("fname"=>"firstname", "lname"=>"lastname", "email"=>"my#email.com" );
$classprop = get_object_vars($this);
if(array_key_exists($array[$key], $classprop)){
foreach($classprop as $key=>$value){
$this->{$key} = $array[$key];
}
}
}
}
$user = new assoctoprop;
$user->assign();
echo $user->fname."<br/>";
echo $user->lname."<br/>";
echo $user->email."<br/>";
?>
If I modify the method as such
public function assign(){
$array = array("fname"=>"firstname", "lname"=>"lastname", "email"=>"my#email.com" );
foreach(get_object_vars($this) as $key=>$value){
$this->{$key} = $array[$key];
}
}
it works, but when one key do not match property or vice versa, an undefined index is shown.

Answer 1

You need to move the if statement inside the foreach loop because outside of it, $key is undefined. You also need to check for this $key in your array:
foreach($classprop as $key=>$value){
if(array_key_exists($key, $array)){
You could of course also do it the other way around, loop over $array and check if the property exists in the object.

Answer 2

public function assign(){
$array = array("fname"=>"firstname", "lname"=>"lastname", "email"=>"my#email.com" );
foreach(get_object_vars($this) as $key=>$value){
if(isset($array[$key])){
$this->{$key} = $array[$key];
}
}
}
please add if(isset($array[$key]) check
or better of you still need to init unmutched vars in an object
public function assign(){
$array = array("fname"=>"firstname", "lname"=>"lastname", "email"=>"my#email.com" );
foreach(get_object_vars($this) as $key=>$value){
$this->{$key} = isset($array[$key])? $array[$key] : "";
}
}