给我们提供了Zend_Debug类用来打印或返回某个表达式或变量的信息。
使用方法如下：
Zend_Debug::dump($var, $label=null, $echo=true);
具体实现：
class Zend_Debug{ /** * @var string */ protected static $_sapi = null; /** * Get the current value of the debug output environment. * This defaults to the value of PHP_SAPI. * * @return string; */ public static function getSapi() { if (self::$_sapi === null) { self::$_sapi = PHP_SAPI; } return self::$_sapi; } /** * Set the debug ouput environment. * Setting a value of null causes Zend_Debug to use PHP_SAPI. * * @param string $sapi * @return void; */ public static function setSapi($sapi) { self::$_sapi = $sapi; } /** * Debug helper function. This is a wrapper for var_dump() that adds * the <pre /> tags, cleans up newlines and indents, and runs * htmlentities() before output. * * @param mixed $var The variable to dump. * @param string $label OPTIONAL Label to prepend to output. * @param bool $echo OPTIONAL Echo output if true. * @return string */ public static function dump($var, $label=null, $echo=true) { // format the label $label = ($label===null) ? '' : rtrim($label) . ' '; // var_dump the variable into a buffer and keep the output ob_start(); var_dump($var); $output = ob_get_clean(); // neaten the newlines and indents $output = preg_replace("/]=>(s+)/m", "] => ", $output); if (self::getSapi() == 'cli') { $output = PHP_EOL . $label . PHP_EOL . $output . PHP_EOL; } else { if(!extension_loaded('xdebug')) { $output = htmlspecialchars($output, ENT_QUOTES); } $output = '<pre>' . $label . $output . '</pre>'; } if ($echo) { echo($output); } return $output; }}说白了就是var_dump.
如此简单，如果能够加入更好的调试功能就好了。期待Zend_Debug的更强大的改进。