How can I check if particular item exists in associative array?

Consider:

[
 {
 "pid": "1",
 "pname": "Burger",
 "price": "20",
 "qnty": "1",
 "pimg": "1.jpg"
 },
 {
 "pid": "2",
 "pname": "Cheese burger",
 "price": "30",
 "qnty": "1",
 "pimg": "2.jpg"
 }
]

I have an array like above. How can I check if the array has particular "pid"?

For an example, if an array has "pid" 1 then display "View button", otherwise display "add to cart button".

$array = [
 {
 "pid": "1",
 "pname": "Burger",
 "price": "20",
 "qnty": "1",
 "pimg": "1.jpg"
 },
 {
 "pid": "2",
 "pname": "Cheese burger",
 "price": "30",
 "qnty": "1",
 "pimg": "2.jpg"
 }
]

You can use isset fucntion.

$key = 1;
$count =0 ;

foreach($array as $a) {
    if(isset(array_search($key,$a))){
       //your logic to execute if the $key is there in the array
       $count ++;
   }
 }
  if($count==0){
      //add to cart logic
  }