How to php convert associative array to indexed array in PHP

get index  of array in php
<?php
$arr=array('index1' =>'value1' , "index2" =>'value2' , "index3"=>'value3'); 

$ar=array_values($arr); // convert to indexing  array 

$key=array_keys($arr); // get index name 

for($i=0; $i< count($ar) ; $i++){
echo $key[$i]."=".$ar[$i]."<br> ";
}
  ?>

output

index1=value1
index2=value2
index3=value3

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