Hi,
I have this code in php 5 and whant to adapt for php 7.2
I have tried using foreach instead of While but it returns error sayng "Array to string convertion" in line "$er.= "<b>".$key."</b>: ".$value." after foreach.
Does anybody know how to solve this?
Thank you.

public function getResumen(){
$er="";
$ar = $this->getTrace();
$er.= "<b>Mensaje</b>: ".$this->message."<br/>";
$er.= "<b>Código</b>: ".$this->code."<br/><br/>";
foreach ($ar as $a=>$p){

        //foreach($p as $key => $value){
        while(list($key, $value) = each($p)){ 
            //echo();                
            $er.= "<b>".$key."</b>: ".$value."<br/>";

            ;
        }
    }
    $in="<div style=\"border:1px solid #000000;padding:10px;background:#f6ca6d;\">";
    $in.="<b>Escepsión Resumen</b>:<br/><br/>";
    $in.=$er;
    $in.="</div><br/>";
    return $in;

For the most part, PHP 5.x code can run unchanged on PHP 7. There are a few changes, however, that are classified as backwards incompatible. What this means is that if your PHP 5 code is written in a certain way, or uses functions that have been removed, your code will break, and you'll have a nasty error on your hands.

Read more about to solv Your problem here:

https://subscription.packtpub.com/book/application_development/9781785883446/1/ch01lvl1sec17/creating-a-php-5-to-php-7-code-converter