php全局静态变量

<?php
function counter() {
    static $count = 0;
    $count++;
    echo "The counter is: $count\n";
}

counter(); // 输出: The counter is: 1
counter(); // 输出: The counter is: 2
counter(); // 输出: The counter is: 3
?>

<?php
function threadSafeCounter() {
    static $count = 0;
    static $lock;

    if (empty($lock)) {
        $lock = new SplMutex();
    }

    $lock->lock();
    $count++;
    echo "The counter is: $count\n";
    $lock->unlock();
}

// 模拟多线程环境
$threads = [];
for ($i = 0; $i < 10; $i++) {
    $threads[$i] = new Thread(function() {
        for ($j = 0; $j < 100; $j++) {
            threadSafeCounter();
        }
    });
}

foreach ($threads as $thread) {
    $thread->start();
}

foreach ($threads as $thread) {
    $thread->join();
}
?>

<?php
function memoryLeakExample() {
    static $data = [];

    for ($i = 0; $i < 100000; $i++) {
        $data[] = new stdClass();
    }

    // 手动释放引用
    $data = null;
}

memoryLeakExample();
?>