(PHP 5 >= 5.1.0, PHP 7)
fputcsv — Format line as CSV and write to file pointer
$handle
   , array $fields
   [, string $delimiter = ","
   [, string $enclosure = '"'
   [, string $escape_char = "\"
  ]]] )
   fputcsv() formats a line (passed as a
   fields array) as CSV and write it (terminated by a
   newline) to the specified file handle. 
  
handleThe file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).
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_char
       The optional escape_char parameter sets the
       escape character (one character only).
      
   Returns the length of the written string or FALSE on failure.
  
| Version | Description | 
|---|---|
| 5.5.4 | The escape_charparameter was added | 
Example #1 fputcsv() example
<?php
$list = array (
    array('aaa', 'bbb', 'ccc', 'dddd'),
    array('123', '456', '789'),
    array('"aaa"', '"bbb"')
);
$fp = fopen('file.csv', 'w');
foreach ($list as $fields) {
    fputcsv($fp, $fields);
}
fclose($fp);
?>
The above example will write the following to file.csv:
aaa,bbb,ccc,dddd 123,456,789 """aaa""","""bbb"""
Note: If PHP is not properly recognizing the line endings when reading files either on or created by a Macintosh computer, enabling the auto_detect_line_endings run-time configuration option may help resolve the problem.