Is it possible to vardump the variable inside the action function? i am not able to echo or see results when i am doing so.

This is not a woo commerce question but i am having problems with

add_action('woocommerce_order_status_changed','wc_order_uppdate_to_cancelled_status', 20, 4);
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    Where is the var_dump in this? To be honest I don't really understand your question. You can use var_dump() inside the function that is called from that action, yes – kero Oct 19 '18 at 13:24
  • @kero yes, that question was whether i can use var_dump() inside the function that is called from that action..i am changing the order status from the backend for above function but does not show the any var_dump values...may be it is effecting the users only..nothing in admin side ..thanks for the confirmation – Latheesh V M Villa Oct 19 '18 at 13:28

If you want to use debugging from an action where you won't see the output, you can send things to error_log. First, you need to enable debug logging. In your /wp-config.php add the lines:

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );

This will create a file called /wp-content/debug.log

Next, in your code, add some calls to error_log and var_export:

add_action( 'init', 'some_function' );

function some_function( $var ) {
    error_log( var_export( $var, 1 ) );

Now, when init runs our function, the contents of $var will be dumped to /wp-content/debug.log. Note the second parameter to var_export says to return the output instead of trying to send it to be displayed.

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    thank you exactly what i was looking for..if my question is confusing and if can be improved please feel free to do so. – Latheesh V M Villa Oct 19 '18 at 14:00
  • hi, ` error_log( var_export( $var, 1 ) );` what is parameter 1 in this code? – Latheesh V M Villa Oct 19 '18 at 14:10
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    See the second parameter to var_export on PHP.net. When the second parameter is truthy (e.g. 1, true, etc), var_export will return it's output instead of just dumping it to the screen. – phatskat Oct 19 '18 at 14:16

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