zencart zen

zen cart zen_image 函数是输出一个图片的HTML代码，其实这个函数就是封装了img标签的输出方式。第一个参数就是输出图片的地址，第二个参数就是alt属性，如果这个参数有值的话，也同时给这个标签的title设置同样的值。这个值就是鼠标经过图片的时候显示的文字。 第 三个和第四个参数是图片的宽度和高度。如果安装了image handler插件的话，该插件会根据这两个参数来对输出的图片进行压缩，压缩以最小值为基础。比如设置宽和高比是100×200,但是如果按照这个比例 来压缩的话，如果原始图片的宽和高的比例是1：1.5的话，结果显示的图片大小会是100×150,压缩采用的就是最小值100做为宽来自动按原始图片的 比例来压缩。这样就保证了图片不会变形。 最后一个参数就是img标签的其他属性，比如id,class,style

函数原型代码

function zen_image($src, $alt = ”, $width = ”, $height = ”, $parameters = ”) {global $template_dir;// soft clean the alt tag$alt = zen_clean_html($alt);// use old method on template imagesif (strstr($src, ‘includes/templates’) or strstr($src, ‘includes/languages’) or PROPORTIONAL_IMAGES_STATUS == ’0′) {return zen_image_OLD($src, $alt, $width, $height, $parameters);}//auto replace with defined missing imageif ($src == DIR_WS_IMAGES and PRODUCTS_IMAGE_NO_IMAGE_STATUS == ’1′) {$src = DIR_WS_IMAGES . PRODUCTS_IMAGE_NO_IMAGE;}if ( (empty($src) || ($src == DIR_WS_IMAGES)) && (IMAGE_REQUIRED == ‘false’) ) {return false;}// if not in current template switch to template_defaultif (!file_exists($src)) {$src = str_replace(DIR_WS_TEMPLATES . $template_dir, DIR_WS_TEMPLATES . ‘template_default’, $src);}// hook for handle_image() function such as Image Handler etcif (function_exists(‘handle_image’)) {$newimg = handle_image($src, $alt, $width, $height, $parameters);list($src, $alt, $width, $height, $parameters) = $newimg;}// Convert width/height to int for proper validation.// intval() used to support compatibility with plugins like image-handler$width = empty($width) ? $width : intval($width);$height = empty($height) ? $height : intval($height);// alt is added to the img tag even if it is null to prevent browsers from outputting// the image filename as default$image = ‘<img src=”‘ . zen_output_string($src) . ‘” alt=”‘ . zen_output_string($alt) . ‘”‘;if (zen_not_null($alt)) {$image .= ‘ title=” ‘ . zen_output_string($alt) . ‘ “‘;}if ( ((CONFIG_CALCULATE_IMAGE_SIZE == ‘true’) && (empty($width) || empty($height))) ) {if ($image_size = @getimagesize($src)) {if (empty($width) && zen_not_null($height)) {$ratio = $height / $image_size[1];$width = $image_size[0] * $ratio;} elseif (zen_not_null($width) && empty($height)) {$ratio = $width / $image_size[0];$height = $image_size[1] * $ratio;} elseif (empty($width) && empty($height)) {$width = $image_size[0];$height = $image_size[1];}} elseif (IMAGE_REQUIRED == ‘false’) {return false;}}if (zen_not_null($width) && zen_not_null($height) and file_exists($src)) {// $image .= ‘ width=”‘ . zen_output_string($width) . ‘” height=”‘ . zen_output_string($height) . ‘”‘;// proportional images$image_size = @getimagesize($src);// fix division by zero error$ratio = ($image_size[0] != 0 ? $width / $image_size[0] : 1);if ($image_size[1]*$ratio > $height) {$ratio = $height / $image_size[1];$width = $image_size[0] * $ratio;} else {$height = $image_size[1] * $ratio;}// only use proportional image when image is larger than proportional sizeif ($image_size[0] < $width and $image_size[1] < $height) {$image .= ‘ width=”‘ . $image_size[0] . ‘” height=”‘ . intval($image_size[1]) . ‘”‘;} else {$image .= ‘ width=”‘ . round($width) . ‘” height=”‘ . round($height) . ‘”‘;}} else {// override on missing image to allow for proportional and required/not requiredif (IMAGE_REQUIRED == ‘false’) {return false;} else {$image .= ‘ width=”‘ . intval(SMALL_IMAGE_WIDTH) . ‘” height=”‘ . intval(SMALL_IMAGE_HEIGHT) . ‘”‘;}}// inject rollover class if one is defined. NOTE: This could end up with 2 “class” elements if $parameters contains “class” already.if (defined(‘IMAGE_ROLLOVER_CLASS’) && IMAGE_ROLLOVER_CLASS != ”) {$parameters .= (zen_not_null($parameters) ? ‘ ‘ : ”) . ‘class=”rollover”‘;}// add $parameters to the tag outputif (zen_not_null($parameters)) $image .= ‘ ‘ . $parameters;$image .= ‘ />’;return $image;}

转载于:https://www.cnblogs.com/alex-13/archive/2013/05/11/3072953.html