请推荐一种巧妙、优雅的方式来编写这些重复的'if‘语句

Question

我只知道我做这件事的方式很糟糕：

<?php } elseif ( is_single()) { 

    $url = wp_get_referer();
    $path_parts = pathinfo($url);
    $mycat = $path_parts['filename'];

    if ( $mycat == "animation"  ) {
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "direction"){     
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "grading"){   
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "online"){    
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "showcase"){  
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "showreel"){  
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php } elseif ($mycat == "vfx"){   
        $_SESSION["theCategory"] = $mycat;?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php }else{ ?><a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a><?php };?>

<?php } //end if is_single ?>

它起作用了。但它是混乱和重复的。我试着走这条路：

<?php if ($mycat == "animation" || "direction" || "grading"){

但它根本不起作用。

Answer 1

创建一个保存这些值的数组，然后测试数组中是否存在$mycat的值。此外，无论$mycat是什么，您都会回显链接，因此可以完全删除else语句，并将if结构进一步简化为以下内容：

$categories = array(
    'animation', 
    'direction', 
    'grading', 
    'online', 
    'showcase', 
    'showreel', 
    'vfx'
);

if (in_array($mycat, $categories)) {
    $_SESSION["theCategory"] = $mycat;
}

?>
<a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>

就像其他人所说的，记住避开你的输出。

Answer 2

像这样的东西？

<?php
$cats = array(
    'animation',
    'direction',
    'grading',
    'online',
    'showcase',
    'showreel'
    'vfx',
);
if ( in_array($mycat, $cats) ) :
    $_SESSION['theCategory'] = $mycat; ?>
    <a href="<?php bloginfo('home')?>/category/<?php echo $mycat;?>"><?php echo $mycat;?></a>
<?php else: ?>
    <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php endif; ?>

Answer 3

并使用switch语句：

switch($mycat) {
    case 'animation':
    case 'direction':
    case 'grading':
    case 'online':
    case 'showcase':
    case 'showreel':
    case 'vfx':
        $_SESSION["theCategory"] = $mycat; 
    default:
        ?>
        <a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
        <?php
}

请注意case语句之后的详细说明。你可以这样做，或者：

switch($mycat) {
    case 'animation':
    case 'direction':
    case 'grading':
    case 'online':
    case 'showcase':
    case 'showreel':
    case 'vfx':
        $_SESSION["theCategory"] = $mycat; 
}
?>
<a href="<?php bloginfo('home')?>/category/<?php echo $_SESSION["theCategory"];?>"><?php echo $_SESSION["theCategory"];?></a>
<?php