[Solved] Consider this PHP snippet:<?php if ($_SERVER['REQUEST_METHOD'] == 'POST') { $age = $_POST['age'] ?? 'unknown';... } ?>What will be the output if the form is submitted without the 'age' field? | PHP

PHP - Superglobals and Web Context

Consider this PHP snippet:

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  $age = $_POST['age'] ?? 'unknown';
  echo "Age: $age";
} else {
  echo 'No data submitted';
}
?>

What will be the output if the form is submitted without the 'age' field?

AError: Undefined index

BAge: unknown

CNo data submitted

DAge:

Step-by-Step Solution

Solution:

Step 1: Check if form is submitted via POST
Since the form is submitted, the condition is true.
Step 2: Use null coalescing operator
$_POST['age'] is missing, so $age gets 'unknown'.
Final Answer:
Age: unknown -> Option B
Quick Check:
Missing field uses default with ?? operator [OK]

Quick Trick: Use ?? to provide default if POST field missing [OK]

Common Mistakes:

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