Alter Version

vendor/PhpSpreadsheet/Worksheet/Iterator.php

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+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Worksheet;
+
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+
+class Iterator implements \Iterator
+{
+    /**
+     * Spreadsheet to iterate.
+     *
+     * @var Spreadsheet
+     */
+    private $subject;
+
+    /**
+     * Current iterator position.
+     *
+     * @var int
+     */
+    private $position = 0;
+
+    /**
+     * Create a new worksheet iterator.
+     */
+    public function __construct(Spreadsheet $subject)
+    {
+        // Set subject
+        $this->subject = $subject;
+    }
+
+    /**
+     * Destructor.
+     */
+    public function __destruct()
+    {
+        $this->subject = null;
+    }
+
+    /**
+     * Rewind iterator.
+     */
+    public function rewind(): void
+    {
+        $this->position = 0;
+    }
+
+    /**
+     * Current Worksheet.
+     *
+     * @return Worksheet
+     */
+    public function current()
+    {
+        return $this->subject->getSheet($this->position);
+    }
+
+    /**
+     * Current key.
+     *
+     * @return int
+     */
+    public function key()
+    {
+        return $this->position;
+    }
+
+    /**
+     * Next value.
+     */
+    public function next(): void
+    {
+        ++$this->position;
+    }
+
+    /**
+     * Are there more Worksheet instances available?
+     *
+     * @return bool
+     */
+    public function valid()
+    {
+        return $this->position < $this->subject->getSheetCount() && $this->position >= 0;
+    }
+}