How to make white blank page error more informatif

i try to make a new function on functions.php of my current theme.
Yes, just create a new function, but my wordpress always error with stupid blank white page.
i’m desperated with white blank page error. ;'(
it just show blank page, no more information there.
—
i have set up wp-config.php:
error_reporting(E_ALL); ini_set(‘display_errors’, 1);
define(‘WP_DEBUG’, true);

but still display no error information, just blank white page, can somebody help me??

—
actually, i created a new function from my current theme

if( ! function_exists( 'generate_layananpro_form' ) ) {
	function generate_layananpro_form($post_id){
		//
		$arr_layananpro = array('top_listing', 'top_agen');
		//
		foreach($arr_layananpro as $a){

			$arr_pre = array();
			$arr_pre = get_layananpro_status_form_db($post_id, $a);
			$arr_pre = array_filter($arr_pre);

			//print_html_r($arr_pre, $a);

			/*
			based on print_html_r function, $arr_pre will result:
			for top_listing it will show below
			Array
				(
				[status] => pending
				[length] => 30
				)

			for top_agen it will show below
			Array
				(
				[status] => approved
				[length] => 20
				)
			*/

			if (!empty($arr_pre)) {
				if($arr_pre['status'] == 'pending'){
					echo "$a -> status pending, please wait<br/>";
				}

				elseif($arr_pre['status'] == 'approved'){
					echo "$a -> status aproved, you can use it now<br/>"
				} 

			}
			else{
				echo "your layanan pro $a is empty <br/>";
			}

		}

	}
}

when i run it, it show blank page.

BUT, when i delete this below line, it work well,

elseif($arr_pre['status'] == 'approved'){
					echo "$a -> status aproved, you can use it now<br/>"
				}