Export to csv

csv.php

<?php 
https://www.yiiframework.com/extension/csvexport
Yii::import('ext.ECSVExport');

// for use with array of arrays
$data = array(
    array('key1'=>'value1', 'key2'=>'value2')
    ....
)

$filename = 'somewriteablefile.csv';
$csv = new ECSVExport($data);
$csv->toCSV($filename); // returns string by default

echo file_get_contents($filename);

// gives you something like
key1,key2
value1,value2
  
?>