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   The Most Useful Plugin Ever wp-content/plugins/the-most-useful-plugin-ever

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<?php
/**
 * Plugin Name: Magic Plugin
 * Description: Magic Plugin performs magic. 
 * Plugin URI: http://example.com/magic-plugin
 * Version: 2.3
 * Author: Mr. Magic 
 * Author URI: http://example.com/
 * Text Domain: magic-plugin 
 * 
 * @package Magic Plugin
 */

?> 

readme.txt readme.txt

WordPress 1

WordPress

WordPress WordPress

WordPress PHP function_exists() ( wp-content )
if (function_exists()) function_exists() FALSE

<?php 
if ( function_exists( 'FUNCTION NAME' ) ) {
  FUNCTION_NAME();
}
?>

alex_get_shoutbox()

<?php
if ( function_exists( 'alex_get_shoutbox' ) ) {
  alex_get_shoutbox();
}
?> 

WordPress WordPress WordPress WordPress

WordPress