(PHP 4, PHP 5, PHP 7)
Prints human-readable information about a variable
mixed print_r ( mixed $expression [, bool $return = false ] )
print_r() displays information about a variable in a way that's readable by humans.
print_r(), var_dump() and var_export() will also show protected and private properties of objects with PHP 5. Static class members will not be shown.
Parameters:
e