smarty/plugins/function.html_image.php
author Dan
Sun, 24 Aug 2008 02:04:09 -0400
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parent 0 c63de9eb7045
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<?php
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/**
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 * Smarty plugin
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 * @package Smarty
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 * @subpackage plugins
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 */
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/**
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 * Smarty {html_image} function plugin
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 *
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 * Type:     function<br>
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 * Name:     html_image<br>
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 * Date:     Feb 24, 2003<br>
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 * Purpose:  format HTML tags for the image<br>
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 * Input:<br>
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 *         - file = file (and path) of image (required)
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 *         - height = image height (optional, default actual height)
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 *         - width = image width (optional, default actual width)
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 *         - basedir = base directory for absolute paths, default
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 *                     is environment variable DOCUMENT_ROOT
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 *         - path_prefix = prefix for path output (optional, default empty)
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 *
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 * Examples: {html_image file="/images/masthead.gif"}
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 * Output:   <img src="/images/masthead.gif" width=400 height=23>
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 * @link http://smarty.php.net/manual/en/language.function.html.image.php {html_image}
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 *      (Smarty online manual)
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 * @author   Monte Ohrt <monte at ohrt dot com>
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 * @author credits to Duda <duda@big.hu> - wrote first image function
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 *           in repository, helped with lots of functionality
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 * @version  1.0
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 * @param array
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 * @param Smarty
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 * @return string
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 * @uses smarty_function_escape_special_chars()
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 */
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function smarty_function_html_image($params, &$smarty)
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{
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    require_once $smarty->_get_plugin_filepath('shared','escape_special_chars');
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    $alt = '';
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    $file = '';
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    $height = '';
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    $width = '';
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    $extra = '';
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    $prefix = '';
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    $suffix = '';
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    $path_prefix = '';
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    $server_vars = ($smarty->request_use_auto_globals) ? $_SERVER : $GLOBALS['HTTP_SERVER_VARS'];
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    $basedir = isset($server_vars['DOCUMENT_ROOT']) ? $server_vars['DOCUMENT_ROOT'] : '';
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    foreach($params as $_key => $_val) {
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        switch($_key) {
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            case 'file':
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            case 'height':
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            case 'width':
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            case 'dpi':
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            case 'path_prefix':
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            case 'basedir':
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                $$_key = $_val;
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                break;
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            case 'alt':
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                if(!is_array($_val)) {
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                    $$_key = smarty_function_escape_special_chars($_val);
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                } else {
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                    $smarty->trigger_error("html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE);
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                }
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                break;
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            case 'link':
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            case 'href':
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                $prefix = '<a href="' . $_val . '">';
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                $suffix = '</a>';
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                break;
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            default:
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                if(!is_array($_val)) {
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                    $extra .= ' '.$_key.'="'.smarty_function_escape_special_chars($_val).'"';
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                } else {
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                    $smarty->trigger_error("html_image: extra attribute '$_key' cannot be an array", E_USER_NOTICE);
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                }
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                break;
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        }
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    }
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    if (empty($file)) {
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        $smarty->trigger_error("html_image: missing 'file' parameter", E_USER_NOTICE);
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        return;
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    }
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    if (substr($file,0,1) == '/') {
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        $_image_path = $basedir . $file;
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    } else {
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        $_image_path = $file;
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    }
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    if(!isset($params['width']) || !isset($params['height'])) {
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        if(!$_image_data = @getimagesize($_image_path)) {
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            if(!file_exists($_image_path)) {
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                $smarty->trigger_error("html_image: unable to find '$_image_path'", E_USER_NOTICE);
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                return;
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            } else if(!is_readable($_image_path)) {
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                $smarty->trigger_error("html_image: unable to read '$_image_path'", E_USER_NOTICE);
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                return;
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            } else {
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                $smarty->trigger_error("html_image: '$_image_path' is not a valid image file", E_USER_NOTICE);
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                return;
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            }
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        }
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        if ($smarty->security &&
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            ($_params = array('resource_type' => 'file', 'resource_name' => $_image_path)) &&
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            (require_once(SMARTY_CORE_DIR . 'core.is_secure.php')) &&
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            (!smarty_core_is_secure($_params, $smarty)) ) {
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            $smarty->trigger_error("html_image: (secure) '$_image_path' not in secure directory", E_USER_NOTICE);
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        }        
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        if(!isset($params['width'])) {
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            $width = $_image_data[0];
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        }
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        if(!isset($params['height'])) {
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            $height = $_image_data[1];
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        }
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    }
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    if(isset($params['dpi'])) {
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        if(strstr($server_vars['HTTP_USER_AGENT'], 'Mac')) {
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            $dpi_default = 72;
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        } else {
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            $dpi_default = 96;
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        }
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        $_resize = $dpi_default/$params['dpi'];
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        $width = round($width * $_resize);
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        $height = round($height * $_resize);
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    }
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    return $prefix . '<img src="'.$path_prefix.$file.'" alt="'.$alt.'" width="'.$width.'" height="'.$height.'"'.$extra.' />' . $suffix;
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}
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/* vim: set expandtab: */
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?>