Kimi chinh sua

analyze_khachhang.php

@@ -0,0 +1,28 @@
+<?php
+require 'vendor/autoload.php';
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+
+$inputFileName = 'khachhang.xlsx';
+
+try {
+    $spreadsheet = IOFactory::load($inputFileName);
+    $worksheet = $spreadsheet->getActiveSheet();
+    $rows = $worksheet->toArray();
+
+    echo "--- HEADER COLUMNS ---\n";
+    if (isset($rows[0])) {
+        foreach ($rows[0] as $index => $header) {
+            echo "Col " . $index . ": " . ($header ?? "NULL") . "\n";
+        }
+    }
+
+    echo "\n--- SAMPLE DATA (Rows 2-5) ---\n";
+    for ($i = 1; $i <= 4; $i++) {
+        if (isset($rows[$i])) {
+            echo "Row " . ($i + 1) . ": " . implode(" | ", array_map(fn($v) => $v ?? "NULL", $rows[$i])) . "\n";
+        }
+    }
+} catch (Exception $e) {
+    echo 'Error loading file: ' . $e->getMessage();
+}