do_action( "admin_post_{$action}" )

Fires on an authenticated admin post request for the given action.


Description Description

The dynamic portion of the hook name, $action, refers to the given request action.


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Source Source

File: wp-admin/admin-post.php

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Changelog Changelog

Changelog
Version Description
2.6.0 Introduced.

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User Contributed Notes User Contributed Notes

  1. Skip to note 1 content
    Contributed by Aamer Shahzad

    This hook allows us to create our own handler for GET or POST request. for example we want to call a function when form is submitted, we can do this with the following code.

    <form action="http://www.example.com/wp-admin/admin-post.php" method="post">
    <input type="hidden" name="action" value="our_action_hook">
    <input type="submit" value="Submit">
    </form>

    This will submit form on the following url
    http://www.example.com/wp-admin/admin-post.php?action=our_action_hook

    in our function.php we can call the hook as “admin_post_” followed by {$action}

    add_action( 'admin_post_our_action_hook', 'am_our_action_hook_function' );
    function am_our_action_hook_function() {
        // do something
    }
  2. Skip to note 2 content
    Contributed by Aamer Shahzad
    &lt;form action="<?php echo admin_url( 'admin-post.php' ); ?>">
    	&lt;input type="hidden" name="action" value="generate_csv" />
    	&lt;input type="submit" name="submit" class="button button-primary" value="Generate & Download CSV File" />
    &lt;/form>
    /**
     * Generate CSV File.
     */
    
    add_action( 'admin_post_generate_csv', 'lunchbox_generate_orders_csv' );
    function lunchbox_generate_orders_csv() {
    
    	global $wpdb;
    
    	$filename = 'lunchbox-orders';
    	$generatedDate = $generatedDate = date('d-m-Y His');
    
    	/**
    	 * output header so that file is downloaded
    	 * instead of open for reading.
    	 */
    	header("Pragma: public");
    	header("Expires: 0");
    	header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    	header("Cache-Control: private", false);
    	header('Content-Type: text/csv; charset=utf-8');
    	// header("Content-Type: application/octet-stream");
    	header("Content-Disposition: attachment; filename=\"" . $filename . " " . $generatedDate . ".csv\";" );
    	// header('Content-Disposition: attachment; filename=lunchbox_orders.csv');
    	header("Content-Transfer-Encoding: binary");
    
    	/**
    	 * create a file pointer connected to the output stream
    	 * @var [type]
    	 */
    	$output = fopen('php://output', 'w');
    	$results = $wpdb->get_results( "SELECT * FROM $wpdb->posts WHERE post_type = 'shop_order'", ARRAY_A );
    
    	/**
    	 * output the column headings
    	 */
    	fputcsv( $output, array('Order ID', 'Order Title', 'Order Date'));
    
    	foreach ( $results as $key => $value ) {
    		// $array[] = '';
    		$modified_values = array( 
    			$value['ID'],
    			$value['post_title'],
    			$value['post_date']
    		);
    
    		fputcsv( $output, $modified_values );
    	}
    	return $output;
    }

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