php - How to convert onsubmit to form_open -

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my code this:

<form action="http://<?php echo site_url();?>/loader/task1" onsubmit="return checkdifferance();" method="post">

how can convert onsubmit form_open? how improve code below?

<?php echo form_open('loder/task1');?>

try this

<?php echo form_open('loder/task1', array('onsubmit' => 'return checkdifferance();'));?>

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