PHP编程的五个良好习惯

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 
 

以下为引用的内容：
＜?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()
    {
        return $this-＞message;
    }
    
    public function setMessage($msg)
    {
        $this-＞message = $msg;
    }
}


/*
 * Counts the messages with the given severity in the array
 * of messages.
 * 
 * @param $messages An array of ResultMessage
 * @return int Count of messages with a severity of "Error"
 */
function countErrors($messages)
{
    $matchingCount = 0;
    foreach($messages as $m) {
        if ($m-＞getSeverity() == "Error") {
            $matchingCount++;
        }
    }
    return $matchingCount;
}

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

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

?＞
 
 

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