PHP编程的五个良好习惯

function cntMsgs($messages)
{
    $n = 0;
    /* iterate through the messages... */
    foreach($messages as $m) {
        if ($m-＞getSeverity() == ''Error'') {
            $n++; // add one to the result;
        }
    }
    return $n;
}

$messages = array(new ResultMessage("Error", "This is an error!"),
    new ResultMessage("Warning", "This is a warning!"),
    new ResultMessage("Error", "This is another error!"));
   
$errs = cntMsgs($messages);

echo("There are " . $errs . " errors in the result.n");

?＞

良好习惯：带注释的函数和类

清单 6 中的注释告诉读者类和方法的目的。该注释解释了为什么代码在做当前的工作，这对未来维护代码十分有用。可能需要根据条件变更而修改代码，如果能够轻松了解代码的目的，则修改起来很容易。

清单 6. 良好习惯：带注释的函数和类

＜?php
/**
 * The ResultMessage class holds a message that can be returned
 * as a result of a process. The message has a severity and
 * message.
 *
 * @author nagood
 *
 */
class ResultMessage
{
    private $severity;
    private $message;
   
    /**
     * Constructor for the ResultMessage that allows you to assign
     * severity and message.
     * @param $sev See {@link getSeverity()}
     * @param $msg
     * @return unknown_type
     */
    public function __construct($sev, $msg)
    {
        $this-＞severity = $sev;
        $this-＞message = $msg;
    }
   
    /**
     * Returns the severity of the message. Should be one
     * "Information", "Warning", or "Error".
     * @return string Message severity
     */
    public function getSeverity()
    {
        return $this-＞severity;
    }
   
    /**
     * Sets the severity of the message
     * @param $severity
     * @return void
     */
    public function setSeverity($severity)
    {
        $this-＞severity = $severity;
    }
   
    public function getMessage()
    {
    

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