Custom Query Arguments - Read For Learn

/**
 * Define a new function that uses $args and wp_parse_args()
 */
function explain_parse_args( $args ) {
    $defaults = array (
        'text' => 'wp_parse_args() merges $args into $defaults',
        'before' => "",
        'after' => " \n",
        'echo' => TRUE
    );

    // Parse incomming $args into an array and merge it with $defaults
    $args = wp_parse_args( $args, $defaults );

    // OPTIONAL: Declare each item in $args as its own variable i.e. $type, $before.
    extract( $args, EXTR_SKIP );

    $output = $before . $text . $after;

    if (!$echo) 
        return $output;

    echo $output;
}

/**
 * Run our new function using the defaults (no $args)
 * This would print out: 
 *  wp_parse_args() merges $args into $defaults
 */
explain_parse_args();

/**
 * Run the function with some options overriden with an array
 * This would echo the output with the modified text and before arguments:
 *  A better explanation
 */
explain_parse_args( array (
    'text' => "A better explanation",
    'before' => ""
) );

/**
 * We can also pass in URL-style string-query and it will be converted
 * This would set $args['echo'] to 1 and $args['text'] to 0 
 */
explain_parse_args( 'echo=1&text=0' );
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