今天遇到了drupal输出一个用户名的问题，使用的是drupal的主题函数theme输出的，于是查资料搜索，摸索出来以下一些内容:
1、theme('username', array('account' => $log))调用函数， 参数1为hook, 参数2为参数
代码比较多不展出了，查看地址点击打开链接
2、执行期间回去找模版的预处理函数和处理函数分别是 template_preprocess_username(&$variables)和template_process_username(&$variables) 这两个函数在theme.inc中
[php]
/**
* Preprocesses variables for theme_username().
*
* Modules that make any changes to variables like 'name' or 'extra' must insure
* that the final string is safe to include directly in the output by using
* check_plain() or filter_xss().
*
* @see template_process_username()
*/
function template_preprocess_username(&$variables) {
$account = $variables['account'];
$variables['extra'] = '';
if (empty($account->uid)) {
$variables['uid'] = 0;
if (theme_get_setting('toggle_comment_user_verification')) {
$variables['extra'] = ' (' . t('not verified') . ')';
}
}
else {
$variables['uid'] = (int) $account->uid;
}
// Set the name to a formatted name that is safe for printing and
// that won't break tables by being too long. Keep an unshortened,
// unsanitized version, in case other preprocess functions want to implement
// their own shortening logic or add markup. If they do so, they must ensure
// that $variables['name'] is safe for printing.
$name = $variables['name_raw'] = format_username($account);
if (drupal_strlen($name) > 20) {
$name = drupal_substr($name, 0, 15) . '...';
}
$variables['name'] = check_plain($name);
$variables['profile_access'] = user_access('access user profiles');
$variables['link_attributes'] = array();
// Populate link path and attributes if appropriate.
if ($variables['uid'] && $variables['profile_access']) {
// We are linking to a local user.
$variables['link_attributes'] = array('title' => t('View user profile.'));
$variables['link_path'] = 'user/' . $variables['uid'];
}
elseif (!empty($account->homepage)) {
// Like the 'class' attribute, the 'rel' attribute can hold a
// space-separated set of values, so initialize it as an array to make it
// easier for other preprocess functions to append to it.
$variables['link_attributes'] = array('rel' => array('nofollow'));
$variables['link_path'] = $account->homepage;
$variables['homepage'] = $account->homepage;
}
// We do not want the l() function to check_plain() a second time.
$variables['link_options']['html'] = TRUE;
// Set a default class.
$variables['attributes_array'] = array('class' => array('username'));
}
/**
* Processes variables for theme_username().
*
* @see template_preprocess_username()
*/
function template_process_username(&$variables) {
// Finalize the link_options array for passing to the l() function.
// This is done in the process phase so that attributes may be added by
// modules or the theme during the preprocess phase.
if (isset($variables['link_path'])) {
// $variables['attributes_array'] contains attributes that should be applied
// regardless of whether a link is being rendered or not.
// $variables['link_attributes'] contains attributes that should only be
// applied if a link is being rendered. Preprocess functions are encouraged
// to use the former unless they want to add attributes on the link only.
// If a link is being rendered, these need to be merged. Some attributes are
// themselves arrays, so the merging needs to be recursive.
$variables['link_options']['attributes'] = array_merge_recursive($variables['link_attributes'], $variables['attributes_array']);
}
}
/**
* Preprocesses variables for theme_username().
*
* Modules that make any changes to variables like 'name' or 'extra' must insure
* that the final string is safe to include directly in the output by using
* check_plain() or filter_xss().
*
* @see template_process_username()
*/
function template_preprocess_username(&$variables) {
$account = $variables['account'];
$variables['extra'] = '';
if (empty($account->uid)) {
$variables['uid'] = 0;
if (theme_get_setting('toggle_comment_user_verification')) {
$variables['extra'] = ' (' . t('not verified') . ')';
}
}
else {
$variables['uid'] = (int) $account->uid;
}
// Set the name to a formatted name that is safe for printing and
// that won't break tables by being too long. Keep an unshortened,
// unsanitized version, in case other preprocess functions want to implement
// their own shortening logic or add markup. If they do so, they must ensure
// that $variables['name'] is safe for printing.
$name = $variables['name_raw'] = format_username($account);
if (drupal_strlen($name) > 20) {
$name = drupal_substr($name, 0, 15) . '...';
}
$variables['name'] = check_plain($name);
$variables['profile_access'] = user_access('access user profiles');
$variables['link_attributes'] = array();
// Populate link path and attributes if appropriate.
if ($variables['uid'] && $variables['profile_access']) {
// We are linking to a local user.
$variables['link_attributes'] = array('title' => t('View user profile.'));
$variables['link_path'] = 'user/' . $variables['uid'];
}
elseif (!empty($account->homepage)) {
// Like the 'class' attribute, the 'rel' attribute can hold a
// space-separated set of values, so initialize it as an array to make it
// easier for other preprocess functions to append to it.
$variables['link_attributes'] = array('rel' => array('nofollow'));
$variables['link_path'] = $account->homepage;
$variables['homepage'] = $account->homepage;
}
// We do not want the l() function to check_plain() a second time.
$variables['link_options']['html'] = TRUE;
// Set a default class.
$variables['attributes_array'] = array('class' => array('username'));
}
/**
* Processes variables for theme_username().
*
* @see template_preprocess_username()
*/
function template_process_username(&$variables) {
// Finalize the link_options array for passing to the l() function.
// This is done in the process phase so that attributes may be added by
// modules or the theme during the preprocess phase.
if (isset($variables['link_path'])) {
// $variables['attributes_array'] contains attributes that should be applied
// regardless of whether a link is being rendered or not.
// $variables['link_attributes'] contains attributes that should only be
// applied if a link is being rendered. Preprocess functions are encouraged
// to use the former unless they want to add attributes on the link only.
// If a link is being rendered, these need to be merged. Some attributes are
// themselves arrays, so the merging needs to be recursive.
$variables['link_options']['attributes'] = array_merge_recursive($variables['link_attributes'], $variables['attributes_array']);
}
}
3、处理完这些变量后接下来就到了主题函数了，这里实现了最终html的拼装与输出 theme_username($variables);
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[php]
function theme_username($variables) {
if (isset($variables['link_path'])) {
// We have a link path, so we should generate a link using l().
// Additional classes may be added as array elements like
// $variables['link_options']['attributes']['class'][] = 'myclass';
$output = l($variables['name'] . $variables['extra'], $variables['link_path'], $variables['link_options']);
}
else {
// Modules may have added important attributes so they must be included
// in the output. Additional classes may be added as array elements like
// $variables['attributes_array']['class'][] = 'myclass';
$output = '' . $variables['name'] . $variables['extra'] . '';
}
return $output;
} '>
function theme_username($variables) {
if (isset($variables['link_path'])) {
// We have a link path, so we should generate a link using l().
// Additional classes may be added as array elements like
// $variables['link_options']['attributes']['class'][] = 'myclass';
$output = l($variables['name'] . $variables['extra'], $variables['link_path'], $variables['link_options']);
}
else {
// Modules may have added important attributes so they must be included
// in the output. Additional classes may be added as array elements like
// $variables['attributes_array']['class'][] = 'myclass';
$output = '' . $variables['name'] . $variables['extra'] . '';
}
return $output;
}
'>
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