PHP

init hook wordpress

<?php
add_action('init', 'process_post');
function process_post()
{
	?>
	<script>alert('it works');</script>	<!-- page load time called -->
	<?php
}
?>

wordpress init hook

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add_action( 'init', 'process_post' );
 
function process_post() {
     if( isset( $_POST['unique_hidden_field'] ) ) {
          // process $_POST data here
     }
}