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wp-content/plugins/pressable-cache-management/admin/custom-functions/cache-purge-admin-bar.php

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+<?php  //Pressable Cache Purge Adds a Cache Purge button to the admin bar
+
+
+// disable direct file access
+if (!defined('ABSPATH'))
+{
+
+    exit;
+
+}
+
+add_action( 'admin_bar_menu', 'cache_add_item', 100 );
+
+function cache_add_item( $admin_bar ) {
+
+	if ( is_admin() ) {
+		global $pagenow;
+
+		$admin_bar->add_menu(
+			array(
+				'id'    => 'cache-purge',
+				'title' => 'Object Cache Purge',
+				'href'  => '#',
+			)
+		);
+		// $admin_bar->add_menu( array( 'id'=>'settings','title'=>'Cache Settings', 'parent'=> 'cache-purge', 'href'=>'admin.php?page=pressable_cache_management' ) );
+
+	}
+}
+
+
+
+add_action( 'admin_footer', 'cache_purge_action_js' );
+
+function cache_purge_action_js() { ?>
+  <script type="text/javascript" >
+	 jQuery("li#wp-admin-bar-cache-purge .ab-item").on( "click", function() {
+		var data = {
+					  'action': 'pressable_cache_purge',
+					};
+
+		jQuery.post(ajaxurl, data, function(response) {
+		   alert( response );
+		});
+
+	  });
+  </script>
+
+
+<style type="text/css">
+	
+/*#wp-admin-bar-cache-purge .ab-item { 
+  background-color: #0AD8C7;
+}
+*/
+</style>
+
+
+	<?php
+}
+
+add_action( 'wp_ajax_pressable_cache_purge', 'pressable_cache_purge_callback' );
+
+
+function pressable_cache_purge_callback() {
+	wp_cache_flush();
+
+	//Save time stamp to database if cache is flushed.
+	$object_cache_flush_time = date( ' jS F Y  g:ia' ) . "\nUTC";
+
+	update_option( 'flush-obj-cache-time-stamp', $object_cache_flush_time );
+	$response = 'Object Cache Purged';
+	echo $response;
+	wp_die();
+}