Online PHP editor | output for ZfYMp

<?php $input_args = [ [ "required" => "", "html_label_text" => "", "required_validation_error_message" => "", "html_name" => "ee_reg_qstn[356][17]", "html_id" => "**ee-reg-qstn", "default" => "** **Male**" ], [ "required" => "", "html_label_text" => "", "required_validation_error_message" => "", "html_name" => "ee_reg_qstn[356][12]", "html_id" => "**ee-reg-qstn", "default" => "** **Blue**" ], [ "required" => "", "html_label_text" => "", "required_validation_error_message" => "", "html_name" => "ee_reg_qstn[356][18]", "html_id" => "**ee-reg-qstn", "default" => "** **144**" ] ]; print_r(array_column($input_args, "default", "html_name"));