array key value php

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
foreach($age as $x=>$x_value)
  {
  echo "Key=" . $x . ", Value=" . $x_value;
  echo "<br>";
  }
?>$id = 1;
$age = 2;    
$sort = "id"; // or "age";
    $Key = $$sort;
$arr = array($Key => 'string');

print_r($arr);array_keys ($array);
// It returns an array
// more informations at https://www.php.net/manual/fr/function.array-keys.php (fr)$healthStructureData = [
            'product' => $product,
            'website_data' => $website_data,
            'total_keywords' => $total_keywords,
            'certificate_status' => $certificate_status,
            'total_user_websites' => $total_user_websites,
        ];

foreach ($healthStructureData as $key => $value) {
  $$key = $value;
}function myfunc(){
    $arr = array();
    $arr[] = 'value0';
    $arr['key1'] = 'value1';
    $arr['key2'] = 'value2';
    $arr[] = 'value3';
    return $arr;
}
foreach($bigArray as $array){    
    foreach($array as $key=>$value){
        echo $key;
    }
}


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