echo statement repeats

创建第一个wp插件。

对\\u内容使用带筛选器的add action init

我注意到，每当我回显任何内容时，它都会在标题中出现两次，最后在正文中出现一次。

为什么？

或者我该如何避免这种情况？

kthxbai

EDIT

function my_module_init() {
  //Filter this content
  add_filter(\'the_content\', \'my_content_ctrlr\');
}
add_action(\'init\', \'my_module_init\');

// function controller plug-in
function my_content_ctrlr($content) {
  global $post;

//Get value of metabox from current id
  $codeUnit = get_post_meta($post->ID, \'list_unit_meta_key\', true); 

//If none selected from metabox, skip it as its a regular page
  if( $codeUnit == \'NULL\' || !isset($codeUnit) || $codeUnit == \'\') {
    return $content;
  }

//if I add echo anything, it shows up twice in head and once in body
//  WHY?
//echo $codeUnit;

    ob_start(); 

    //If photo included display grid view, else table view
    if  ($includePhoto == \'on\') {
        include(plugin_dir_path(__FILE__) . \'views/my-grid.php\');
    } else {
        include(plugin_dir_path(__FILE__) . \'views/my-table.php\');
    }

    $output = ob_get_contents();
    ob_end_clean();
    return $output;

}

function my_module_init() { add_filter(\'the_content\', \'my_content_ctrlr\'); } add_action(\'init\', \'my_module_init\'); function my_content_ctrlr( $content ) { ob_start(); // This file contains only the following simple text for testing purposes: ######### include( plugin_dir_path( __FILE__ ) . \'views/my-grid.php\' ); $output = ob_get_contents(); ob_end_clean(); // Add our custom code before the existing content. return $output . $content; }

function pippin_filter_content_sample($content) { if( is_singular() && is_main_query() ) { $new_content = \'<p>This is added to the bottom of all post and page content, as well as custom post types.</p>\'; $content .= $new_content; } return $content; } add_filter(\'the_content\', \'pippin_filter_content_sample\');

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