gf-custom-class.php

<?php

if (!class_exists('GFCustomClass')) {

	class GFCustomClass {

	//display admin warnings if GF is not the correct version or GF is not installed
	public static function admin_warnings($plugin, $textdomain, $min_gf_version) {
		if ( !self::is_gravityforms_installed() ) {
			$message = __('requires Gravity Forms to be installed.', $textdomain);
		} else
		if ( !self::is_gravityforms_supported($min_gf_version) ) {
			$message = __('requires a minimum Gravity Forms version of ', $textdomain) . $min_gf_version;
		}

		if (empty($message)) {
			return;
		}?>

		<div class="error">
			<p>
				<?php _e('The plugin ', $textdomain); ?><strong><?php echo $plugin; ?></strong> <?php echo $message; ?><br />
				<?php _e('Please ', $textdomain); ?><a href="http://bit.ly/getgravityforms"><?php _e(' download the latest version ',$textdomain); ?></a><?php _e(' of Gravity Forms and try again.',$textdomain) ?>
			</p>
		</div>
	<?php }

	/*
	* Check if GF is installed
	*/
	public static function is_gravityforms_installed() {
		return class_exists( 'RGForms' );
	}

	/*
	* Check if the installed version of GF is supported
	*/
	public static function is_gravityforms_supported($min_gf_version = '1.5') {
		return self::check_gravityforms_version( $min_gf_version,'>=' );
	}

	/*
	* Do a GF version compare
	*/
	public static function check_gravityforms_version($version, $operator) {
		if(class_exists('GFCommon')) {
			return version_compare( GFCommon::$version, $version, $operator );
		}

		return false;
	}

	/*
	* Returns the url of the plugin's root folder
	*/
	public function get_base_url() {
		return plugins_url(null, __FILE__);
	}

	/*
	* Returns the physical path of the plugin's root folder
	*/
	public function get_base_path() {
		$folder = basename(dirname(__FILE__));
		return WP_PLUGIN_DIR . '/' . $folder;
	}

	/**
	* starts_with
	* Tests if a text starts with an given string.
	*
	* @param     string
	* @param     string
	* @return    bool
	*/
	public static function starts_with($haystack, $needle) {
		return strpos($haystack, $needle) === 0;
	}

	/*
	* returns true if a needle can be found in a haystack
	*/
	public static function str_contains($haystack, $needle) {
		if (empty($haystack) || empty($needle))
			return false;

		$pos = strpos(strtolower($haystack), strtolower($needle));

		if ($pos === false)
			return false;
		else
			return true;
		}
	}
} ?>