(PHP 5 >= 5.4.0, PHP 7)
SplFileObject::fputcsv — Write a field array as a CSV line
$fields
   [, string $delimiter = ","
   [, string $enclosure = '"'
   [, string $escape = "\\"
  ]]] ) : int
   Writes the fields array to the file as a CSV line.
  
fieldsAn array of values.
delimiter
      The optional delimiter parameter sets the field
      delimiter (one character only).
     
enclosure
      The optional enclosure parameter sets the field
       enclosure (one character only).
     
escape
      The optional escape parameter sets the
      escape character (at most one character).
      An empty string ("") disables the proprietary escape mechanism.
     
Note:
If an
enclosurecharacter is contained in a field, it will be escaped by doubling it, unless it is immediately preceded by anescape_char.
   Returns the length of the written string 或者在失败时返回 FALSE.
  
   Returns FALSE, and does not write the CSV line to the file, if the
   delimiter or enclosure
   parameter is not a single character.
  
   An E_WARNING level error is issued if the
   delimiter or enclosure
   parameter is not a single character.
  
| 版本 | 说明 | 
|---|---|
| 7.4.0 | The escapeparameter now also accepts an empty
        string to disable the proprietary escape mechanism. | 
| 5.5.21, 5.6.5 | Added the escapeparameter. | 
Example #1 SplFileObject::fputcsv() example
<?php
$list = array (
    array('aaa', 'bbb', 'ccc', 'dddd'),
    array('123', '456', '789'),
    array('"aaa"', '"bbb"')
);
$file = new SplFileObject('file.csv', 'w');
foreach ($list as $fields) {
    $file->fputcsv($fields);
}
?>
The above example will write the following to file.csv:
aaa,bbb,ccc,dddd 123,456,789 """aaa""","""bbb"""