提高php代码可读性的三个技巧【转】

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:

1. if ( $userLoggedIn )
2. {
3.     // 上百行代码...
4. } else {
5.     exit () ;
6. }

清楚的写法：

1. if ( ! $userLoggedIn )
2. {
3.     exit () ;
4. }
6. // 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:

1. echo " <table size= \" 100 \" > \n " ;
2. echo " <tbody> \n " ;
4. if ( $displayResults ) {
5. while ( $row = mysql_fetch_assoc ( $result )) { ?>
6.    echo "<tr>\n";
7.    echo "<td>" . htmlentities($row['id']) . "</td>\n";
8.    echo "</tr>\n";
9.    }
10. }
12. echo "</tbody>\n";
13. echo "</table>\n";
14. ?>
15. ?>

用end…的写法:

1. <table>
2. <tbody>
3.    <?php if ( $displayResults ) : ?>
4.    <?php while ( $row = mysql_fetch_assoc ( $result )) : ?>
5.    <tr>
6. <td> <?php echo htmlentities ( $row [ ' id ' ]) ; ?> </td>
7.    </tr>
8.    <?php endwhile ; ?>
9.    <?php endif ; ?>
10. </tbody>
11. </table>

3.多用sprintf等函数

看着头疼的写法:

1. $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:

1. $sql = ' SELECT col1, col2, col3 ' .
2.     ' FROM people ' .
3.     ' WHERE first_name = "%s" ' .
4.     ' AND last_name = "%s" ' .
5.     ' AND foo = "%s" ' .
6.     ' ORDER BY col1 ' ;
9. $sql = sprintf ( $sql , mysql_real_escape_string ( $first_name ) ,
10.     mysql_real_escape_string ( $last_name ) ,
11.     ( $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