Question

我们如何在if语句中检查数组的索引，以及它是否可用而不是跳过或执行某些操作。我在数组函数中使用但它不工作并抛出未定义偏移量的错误。

<!DOCTYPE html>
<html>
<head>
    <title>csv view</title>
</head>
<body>
    <table>
        <thead>
            <?php
                $num_of_rows = count($missing_record_data);
                $num_of_columns = count($missing_record_data[$index]);

                for($i=0; $i<=$num_of_columns-1; $i++): 
            ?>
                    <th><?= $column_names[$i]; ?></th>
            <?php endfor; ?>
        </thead>
        <tbody>
            <?php for($i=0; $i<=$num_of_rows-1; $i++): ?>
                <?php
                    if(in_array($missing_record_data[$i+1],$missing_record_data)):
                ?>
                <tr>
                    <?php for($j=0; $j<=$num_of_columns-1; $j++): ?>
                        <td><?= $missing_record_data[$i+1][$j]; ?></td>
                    <?php endfor; ?>
                </tr>
                <?php
                    endif;
                    endfor;
                ?>
        </tbody>
    </table>
    <h1><strong>Note:</strong>These rows were not imported because the blank fields are required. Rest has been uploaded successfully.</h1>
</body>
</html>

这是错误：

Severity: Notice

Message: Undefined offset: 1

Filename: views/uploaded_csv_view.php

Line Number: 21

如果某个索引不可用，检查数组的if（）逻辑是什么？

0 个答案: