mysql打印输出转csv格式

<?php
$str = file_get_contents("./input.csv");
$str = preg_replace('/\+\-\-\-[-+]*\-\-\-\+/', '', $str);
$lines = preg_split('/\r*\n/', $str);
$lines = array_filter($lines);
$csv = []; 
foreach($lines as $line){
  $item = explode('|', $line);
  $item = array_filter($item);
  foreach($item as $key=>$val){
      $item[$key] = trim($val);
  }
  $csv[] = $item;
}
$fp = fopen('output.csv', 'w');
foreach ($csv as $fields) {
    $line = implode("\t", $fields);
    fwrite($fp, $line . "\n");
}
fclose($fp);
echo "OK\n";