If you don't use a try...catch block, and no error handler it's the same as no error handler with the try...catch blocks

gistfile1.php

<?php

/**
 * Class Arr_Test
 */
class Arr_Test {

  /**
	 * Gives us a property to play with
	 * @var array
	 */
	var $objArr = array();

	/**
	 * Our object constructor
	 * @param array $myArr
	 */
	public function __construct( array $myArr = array() ) {

        // Initialize our property to the value of the passed param
		$this->objArr = $myArr;

		// call a method to test this code
		$this->print_myarr();
	}

	/**
	 * Simply iterates an array
	 */
	protected function print_myarr(){

		if ( is_array( $this->objArr ) ) {
			if ( count( $this->objArr ) > 0 ) {

				for ( $i=0; $i < count( $this->objArr ); $i++) {

					echo $this->objArr[$i]; // this would fail if our property is not an array

				}

			} else {
				echo "objArr is empty";
			}			
		} else {
			echo "not an array";
		}


	}

}

    $my_string_var = 'I am a string';
    $myObj1 = new Arr_Test( $my_string_var );