使用 HTML 表删除 CSV 文件中的特定行

Question

我有一个HTML table，我使用PHP.. 表中的数据来自CSV file。

我已经可以在文件末尾的新行中添加新数据。我的问题是，如果我想删除 CSV 文件中数据中间的现有行怎么办。我怎样才能做到这一点？顺便说一句，我在这里不使用任何数据库。我只使用HTML Table 和CSV file。下面是我查看 CSV 和添加新数据的代码。

查看

<?php
                            $row = 1;
                                if (($handle = fopen("bin/pdw_table.csv", "r+")) !== FALSE) {

                        ?>
                                    <table class="table table-hover table-striped table-bordered" id="table-data">
                                        <tr>
                                            <th>Field 1</th>
                                            <th>Field 2</th>
                                            <th>Field 3</th>
                                            <th></th>
                                            <th>Field 4</th>
                                            <th>Field 5</th>
                                            <th></th>
                                            <th></th>
                                            <th>Field 6</th>
                                            <th>Field 7</th>
                                            <th>Field 8</th>
                                            <th>Field 9</th>
                                            <th>Field 10</th>
                                            <th>Field 11</th>
                                            <th>Field 12</th>
                                            <th>Field 13</th>
                                            <th></th>
                                            <th>Field 14</th>
                                            <th>Field 15</th>
                                            <th>Field 16</th>
                                        </tr>
                        <?php
                                        while (($data = fgetcsv($handle, 1000, ',')) !== FALSE) {
                                            $num = count($data);
                        ?>
                                            <tr <?php if($row==0){echo "style='font-weight:bold; background-color:#CCCCCC'";} else {echo "style='background-color:#DDDDDD'";} ?> style="background-color:#DDDDDD">
                        <?php
                                                for ($c=0; $c < $num; $c++) {
                        ?>
                                                <td><?php echo $data[$c]; ?></td>  
                        <?php
                            }
                        ?>
                                            </tr>
                        <?php

                                        $row++;
                                        }
                                        fclose($handle);
                        ?>
                                        <form method="post" name="add1" id="add1" action="<?php echo base_url();?>index.php/datacast_ctr/write_csv" autocomplete="off">
                                            <tr class="td1" id="td1" >  
                                                <td><input type="text" name="val1" id="val1"/></td>
                                                <td><input type="text" name="val2" id="val2"/></td>
                                                <td><input type="text" name="val3" id="val3"/></td>
                                                <td></td>
                                                <td><input type="text" name="val4" id="val4"/></td>
                                                <td><input type="text" name="val5" id="val5"/></td>
                                                <td></td>
                                                <td></td>
                                                <td><input type="text" name="val6" id="val6"/></td>
                                                <td><input type="text" name="val7" id="val7"/></td>
                                                <td><input type="text" name="val8" id="val8"/></td>
                                                <td><input type="text" name="val9" id="val9"/></td>
                                                <td><input type="text" name="val10" id="val10"/></td>
                                                <td><input type="text" name="val11" id="val11"/></td>
                                                <td><input type="text" name="val12" id="val12"/></td>
                                                <td><input type="text" name="val13" id="val13"/></td>
                                                <td></td>
                                                <td><input type="text" name="val14" id="val14"/></td>
                                                <td><input type="text" name="val15" id="val15"/> </td>
                                                <td><input type="text" name="val16" id="val16"/></td>
                                            </tr>
                                        </form>
                                    </table>
                        <?php
                            }
                        ?>

CONTROLLER（添加新数据EOF的代码）

function write_csv()
{
    $R1 = $this->input->post('val1');
    $R2 = $this->input->post('val2');
    $R3 = $this->input->post('val3');
    $H1 = $this->input->post('valh1');
    $R4 = $this->input->post('val4');
    $R5 = $this->input->post('val5');
    $H2 = $this->input->post('valh2');
    $H3= $this->input->post('valh3');
    $R6 = $this->input->post('val6');
    $R7 = $this->input->post('val7');
    $R8 = $this->input->post('val8');
    $R9 = $this->input->post('val9');
    $R10 = $this->input->post('val10');
    $R11 = $this->input->post('val11');
    $R12 = $this->input->post('val12');
    $R13 = $this->input->post('val13');
    $H4 = $this->input->post('valh4');
    $R14 = $this->input->post('val14');
    $R15 = $this->input->post('val15');
    $R16 = $this->input->post('val16');
    $H5 = $this->input->post('valh5');

    $data = $R1.",".$R2.",".$R3.",".$H1.",".$R4.",".$R5.",".$H2.",".$H3.",".$R6.",".$R7.",".$R8.",".$R9.",".$R10.",".$R11.",".$R12.",".$R13.",".$H4.",".$R14.",".$R15.",".$R16;
    $list = array($data);

    $file = fopen("./bin/pdw_table.csv","a+");

    foreach ($list as $line)
    {
        fputcsv($file,explode(',',$line));
    }

    fclose($file);
    redirect('datacast_ctr');
}

Answer 1

AFAIK 你不能这么简单地删除一行。您必须打开文件，逐行读取所有行并将它们放入输出文件中，您要删除的行除外，或者使用this 解决方案。

如果您想知道如何实现，这取决于您的 csv 文件中的数据。如果您有某种唯一键，则可以添加带有按钮的另一列或任何调用删除函数并传递此键的内容。

编辑 这是伪代码，因为我目前没有 php 环境。但是像 $文件数据 = ""; $line = "";

$f = fopen("<filename>", "c+");
while($line = fgets ($f)){
    if($line != "check here if the line is the one to delete"){
        $data.= $line;
    }
}
ftruncate($f,0);
fputs($f, $data);
fclose($f);