使用plugin_basename时出现PHP致命错误

我正在编写我的第一个插件，并调用plugin_basename(__FILE__) 函数结果为：

PHP致命错误：调用未定义的函数plugin\\u basename（）

我的插件位于标准wp-content/plugins/下自己的目录中。我也在使用wordpress 3.3.1，并查看了codex，但没有发现任何错误。出现故障的代码块如下所示：

<?php
/*
Plugin Name: Send Invitation
Plugin URI: http://w3boutique.net
Description: Emails a the link of the current page to a friend
Author: Nandakumar Chandrasekhar
Version: 0.1wp-includes/plugin.php
Author URI: http://w3boutique.net/about-nanda.html
License: GPL2
*/

define( \'SEND_INVITATION_VERSION\', \'0.1\' );

define( \'SEND_INVITATION_REQUIRED_WP_VERSION\', \'3.3.1\' );

// Check if following are required

if ( ! defined( \'SEND_INVITATION_PLUGIN_BASENAME\' ) ) {
    define( \'SEND_INVITATION_PLUGIN_BASENAME\', plugin_basename(__FILE__) );
 }

if ( ! defined( \'SEND_INVITATION_PLUGIN_NAME\' ) ) {
    define( \'SEND_INVITATION_PLUGIN_NAME\', trim( dirname(     SEND_INVITATION_PLUGIN_BASENAME ), \'/\' ) );
}

if ( ! defined( \'SEND_INVITATION_PLUGIN_DIR\' ) ) {
    define( \'SEND_INVITATION_PLUGIN_DIR\', WP_PLUGIN_DIR . \'/\' . SEND_INVITATION_PLUGIN_NAME );
}

if ( ! defined( \'SEND_INVITATION_PLUGIN_URL\' ) ) {
define( \'SEND_INVITATION_PLUGIN_URL\', WP_PLUGIN_URL . \'/\' . SEND_INVITATION_PLUGIN_NAME );
}

// Version check
global $wp_version;

// Message to send if version is below the required version
$exit_msg = \'Send Invitation requires WordPress or newer\' .   SEND_INVITATION_REQUIRED_WP_VERSION . \' <a href="http://codex.wordpress.org/Upgrading_WordPress">Please update!</a>\';

if ( version_compare( $wp_version, SEND_INVITATION_REQUIRED_WP_VERSION, "<" ) ) {
    exit( $exit_msg );
}

function add_send_invitation_link() {
    wp_enqueue_script(\'jquery\');
    wp_enqueue_script( \'show_form.js\', SEND_INVITATION_PLUGIN_URL . \'/js/show_form.js\' );
    wp_enqueue_style( \'send-invitation.css\', SEND_INVITATION_PLUGIN_URL . \'/css/send-invitation.css\' );

    # TODO Put this in another file and include it
    $invitation_form = \'
    <h1><a href="#" onclick="show_form();">Send Invitation</a></h1>
    <form id="invitation-form" method="post" action="javascript:void(0);">
        <p>
            Your Email Address<br />
            <input type="text" name="email" />
        </p>
        <p>
            \' . "Friend\'s Email Address" . \'<br />
            <input type="text" name="email" />
        </p>
        <p>
            Subject<br />
            <input type="text" name="subject" />
        </p>
        <p>
            Message<br/>
            <textarea rows="10" cols="20"></textarea>
        </p>
        <p><input type="submit" name="submit" value="Send" /></p>
     </form>
     <script type="text/javascript">
          jQuery("#invitation-form").submit(function(){
          alert("got here");
          var str = "this";
          jQuery.ajax("\' . SEND_INVITATION_PLUGIN_URL . \'/form-processor.php?action=send_email", str, function(result){
        alert(result);
        });
        alert("finished");
        return(false);
    });
   </script>\';

   return $invitation_form;
}

function send_email() {
     error_log("Inside send email", 0);
     $subject = \'test\';
     $message = \'this is a test from send invitation\';
     $to = \'[email protected]\';
     wp_mail($to, $subject, $message);
}

?>

如果你能给我指点一下我这里可能做错了什么，我将不胜感激。

提前谢谢。

function the_plugin_basename($file) { $file = str_replace(\'\\\\\',\'/\',$file); // sanitize for Win32 installs $file = preg_replace(\'|/+|\',\'/\', $file); // remove any duplicate slash $plugin_dir = str_replace(\'\\\\\',\'/\',WP_PLUGIN_DIR); // sanitize for Win32 installs $plugin_dir = preg_replace(\'|/+|\',\'/\', $plugin_dir); // remove any duplicate slash $mu_plugin_dir = str_replace(\'\\\\\',\'/\',WPMU_PLUGIN_DIR); // sanitize for Win32 installs $mu_plugin_dir = preg_replace(\'|/+|\',\'/\', $mu_plugin_dir); // remove any duplicate slash $file = preg_replace(\'#^\' . preg_quote($plugin_dir, \'#\') . \'/|^\' . preg_quote($mu_plugin_dir, \'#\') . \'/#\',\'\',$file); // get relative path from plugins dir $file = trim($file, \'/\'); return $file; }

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