Check whether current DirectoryIterator position is a valid file

# DirectoryIterator::valid

(PHP 5, PHP 7, PHP 8)

DirectoryIterator::valid — Check whether current DirectoryIterator position is a valid file

### 说明

public function DirectoryIterator::valid(): bool

Check whether current DirectoryIterator position is a valid file.

### 参数

此函数没有参数。

### 返回值

Returns `true` if the position is valid, otherwise `false`

### 示例

示例 #1 A DirectoryIterator::valid() example

    <?php
    $iterator = new DirectoryIterator(dirname(__FILE__));

    // Loop to end of iterator
    while($iterator->valid()) {
        $iterator->next();
    }

    $iterator->valid(); // FALSE
    $iterator->rewind();
    $iterator->valid(); // TRUE

    ?>

### 参见

- DirectoryIterator::current() - Return the current DirectoryIterator item
- DirectoryIterator::key() - Return the key for the current DirectoryIterator item
- DirectoryIterator::next() - Move forward to next DirectoryIterator item
- DirectoryIterator::rewind() - Rewind the DirectoryIterator back to the start
- Iterator::valid() - 检查当前位置是否有效

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