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<?php
echo "<pre>";
// 1. Array comparison: order and key type matter
$a = [0 => "apple", 1 => "banana"];
$b = [1 => "banana", 0 => "apple"];
$c = ["0" => "apple", "1" => "banana"];
echo "Array comparison:\n";
var_dump($a === $b); // false: order matters
var_dump($a === $c); // true: "0" == 0
// 2. FIFO queue using SplQueue
$q = new SplQueue();
$q[] = "first";
$q[] = "second";
$q[] = "third";
echo "\nSplQueue output:\n";
foreach ($q as $item) {
    echo "-> $item\n";
}
// 3. In-memory SQLite database with auto-increment IDs
$db = new PDO("sqlite::memory:");
 
 
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PHP Sandbox — Online PHP and SQL Runner

Write and run PHP code online with live output, SQLite database access, and SQL query testing. Experiment with data structures, SplQueue, benchmarks, and real-time results — directly in your browser.

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