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Here is example for trendlines. Trendline can apply to Scatter Charts, Bar Charts, Column Charts, and Line Charts in which both X and Y are number
<?php
ColumnChart::create(array(
"dataSource"=>array(
array("cat","amount"),
array(1,3),
array(2,8),
array(3,10),
array(4,15),
array(5,18),
),
"columns"=>array("cat","amount"),
"options"=>array(
"trendlines"=> array(
0=>array()
)
)
));
?>
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