How to modify csv file in php

How to modify the csv file in php: first get the current absolute path; then read one line of content in the CSV each time, the code is [while ($data = fgetcsv($file))]; finally this is a Array, to get each data, just access the array subscript.

php method to modify the csv file:

php reads the csv file and processes it with the header as the key Array of names

    header("Content-type: text/html; charset=GBK");//设置输出编码
    ini_set('memory_limit', '1024M');//设置内存
    set_time_limit(0); //设置超时
    $dir = dirname(__FILE__).'/';  //获取当前绝对路径
    $row = 1;//第一行开始
    $file = fopen($dir.'5111.csv', "r");
    # 结果
    $res = array();
    # 计数标示
    $header = [];
    $flag = false;
    $i = 0;
    while ($data = fgetcsv($file)) {//每次读取CSV里面的一行内容
      if (!$flag) {
         $header = $data;//此为一个数组，要获得每一个数据，访问数组下标即可
         $flag = true;
      } else {
         $temp = array_slice($data, 0,11);//取多少列数据
         foreach ($temp as $key => $value) {
            $index = $header[$key];
            $res[$i][$index] = $value;
         }
         $i++;
      }
    }
echo "<pre class="brush:php;toolbar:false">";
print_r($res);
die;

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