提高php代码可读性的三个技巧【转】

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提高php代码可读性的三个技巧
1.让代码的逻辑结构清楚
不清楚的写法:

• if($userLoggedIn)
  
• {
  
•    // 上百行代码...
  
• }else{
  
•    exit();
  
• }
  

清楚的写法：

• if(!$userLoggedIn)
  
• {
  
•    exit();
  
• }
  
• 
  
• // 上百行代码...
  

2.用foreach:endforeach,for:endfor,if:endif,这样的语法来写模板里的代码
可读性不好的写法:

• echo "<table size=\"100\">\n";
  
• echo " <tbody>\n";
  
• 
  
• if($displayResults) {
  
• while($row = mysql_fetch_assoc($result)) { ?>
  
•     echo "<tr>\n";
  
•     echo "<td>" . htmlentities($row['id']) . "</td>\n";
  
•     echo "</tr>\n";
  
•     }
  
• }
  
• 
  
• echo "</tbody>\n";
  
• echo "</table>\n";
  
• ?>
  
• ?>
  

用end…的写法:

• <table>
  
• <tbody>
  
•   <?php if($displayResults): ?>
  
•   <?php while($row = mysql_fetch_assoc($result)): ?>
  
•     <tr>
  
• <td><?php echo htmlentities($row['id']); ?></td>
  
•     </tr>
  
•   <?php endwhile; ?>
  
•   <?php endif; ?>
  
• </tbody>
  
• </table>
  

　　3.多用sprintf等函数
　　看着头疼的写法:

• $sql = "SELECT col1, col2, col3 FROM people WHERE first_name = '" . mysql_real_escape_string($first_name). "' AND last_name = '" . mysql_real_escape_string($last_name) . "'AND foo = '" . ($bar = "good" ? "good": "bad") . "' ORDER BY col1" ;
  

用了sprinf之后的写法:

• $sql = 'SELECT col1, col2, col3 ' .
  
•    'FROM people ' .
  
•    'WHERE first_name = "%s" ' .
  
•    'AND last_name = "%s" ' .
  
•    'AND foo = "%s" ' .
  
•    'ORDER BY col1 ';
  
• 
  
• 
  
• $sql = sprintf($sql, mysql_real_escape_string($first_name),
  
•    mysql_real_escape_string($last_name),
  
•    ($bar = "good" ? "good" : "bad"));
  

可读性提高了不少吧？
原文链接(英文):
Three Quick Tips To Make Your PHP Understandable