... classes and objects, understanding, 15 definition of, 16 identifiers, 16 initial rise of, in PHP, 11 new operator, 16, 21 pass-by-reference rather than pass-by-value, 12–13 PEAR and object-oriented ... 339 channel-discover command, 328 channel-info command, 328 channels, 327 Config class, 330 Config_Container class, 330 Config.php, 330 config-get command, 324 config-show command, 324 Please ... namespaces and, 455 origins of, 4 pass-by-reference rather than pass-by-value, 12–13 PEAR, 6, 13 Phing, description of, 407 PHP 3 and objects, 11 PHP 4 and objects, 12 PHP 4 and var keyword,...