print_rPHP ManualPrevNextprint_rprint_r -- Prints human-readable information about a variable. Descriptionvoid print_r(mixed expression); This function displays information about the values of variables in a way that's readable by humans. If given a string, integer or double, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects. Compare print_r() to var_dump(). 1  2 <?php 3 $a = array (1, 2, array ("a", "b", "c")); 4 print_r ($a); 5 ?> 6  PrevHomeNextissetUpsettype