Returns if the current iterator entry is valid

# SplObjectStorage::valid

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplObjectStorage::valid — Returns if the current iterator entry is valid

### 说明

public function SplObjectStorage::valid(): bool

Returns if the current iterator entry is valid.

### 参数

此函数没有参数。

### 返回值

Returns `true` if the iterator entry is valid, `false` otherwise.

### 示例

示例 #1 SplObjectStorage::valid() example

    <?php
    $s = new SplObjectStorage();

    $o1 = new stdClass;
    $o2 = new stdClass;

    $s->attach($o1, "d1");
    $s->attach($o2, "d2");

    $s->rewind();
    while($s->valid()) {
        echo $s->key()."\n";
        $s->next();
    }
    ?>

以上示例的输出类似于：

    0
    1

### 参见

- SplObjectStorage::current() - Returns the current storage entry
- SplObjectStorage::getInfo() - Returns the data associated with the current iterator entry

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