WordPress中函数get_term_link的参数设置问题
<p><strong style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>为何要用 get_term_link?：</strong><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>新类型的分类是无法用 <?php echo get_category_link( $category_id ); ?> 输出分类链接地址的，需要用 get_term_link() 函数，此函数用法如下： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><?php get_term_link( $term, $taxonomy ); ?> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>具体参考 WordPress Codex：http://codex.wordpress.org/Function_Reference/get_term_link </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>问题： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>举个例： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>- 自定义分类ID的变量为 $term，$term 是根据后台设置而改变的，为了方便说明，这里假定后台参数为 $custom_term = 8 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>- 我要获取自定义分类ID为 $term 的分类链接地址，那么按照官方说明应该是： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><?php </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>$term = $custom_term; </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>echo get_term_link( $term, 'product_cat'); </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>?> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>看似没错，但问题来了，这样会返回错误： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>Catchable fatal error： Object of class WP_Error could not be converted to string in.。没错啊，直接用 echo $term; 输出结果的确是 8，这就让人郁闷了…… </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>不过如果你直接这样： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><?php echo get_term_link( 8, 'product_cat'); ?> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>又能正常工作。 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><strong style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>解决方法： </strong><br><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>在 WordPress Codex 打转时，无意中看到国外朋友也碰到这个问题，然后他自己解决了，顿悟……传送门 》 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>原来是变量类型问题，这 get_term_link 函数和其它常用的 WordPress 函数不同，不会自己转换变量类型，你得先把字符类转换为整数才能正常工作，好Orz的函数！ </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>下面这样就能正常工作： </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>（坐在沙发上的Bolo注：intval($term, 10)会更好，不然$term值太大的时候会有进制转换问题，要么就用(int)$term） </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><?php </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>$term = $custom_term; </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>echo get_term_link( intval($term), 'product_cat'); </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>?> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>所以，以后遇到类似这郁闷的函数，就要考虑是不是变量数据类型问题了。 </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>折腾玩（完）。 </span></p>
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