PHP数组foreach遍历输出例子介绍
发布时间:2022-07-24 11:57:20 所属栏目:PHP教程 来源:互联网
导读:通常我们对于数据遍历会使用到foreach来操作当然也有使用到while list each函数来实现了,但在方便面上来看foreach更简洁好用性能也非常的不错,下面本人整理了一款在开发应用中foreach前后使用例子,希望对大家会有所帮助. 简单的一个php数组函数,之前没这个需
通常我们对于数据遍历会使用到foreach来操作当然也有使用到while list each函数来实现了,但在方便面上来看foreach更简洁好用性能也非常的不错,下面本人整理了一款在开发应用中foreach前后使用例子,希望对大家会有所帮助. 简单的一个php数组函数,之前没这个需要一直都不知道有这么一个函数,擦汗... php数组逆序输出代码 foreach(array_reverse($array) AS $key=>$value){ echo $value.' '; } array_reverse (PHP 4, PHP 5) array_reverse — 返回一个单元顺序相反的数组 说明:array array_reverse ( array $array [, bool $preserve_keys ] ) array_reverse() 接受数组 array 作为输入并返回一个单元为相反顺序的新数组,如果 preserve_keys 为 TRUE 则保留原来的键名. Example #1 array_reverse() 例子,代码如下: <?php $input = array("php", 4.0, array("green", "red")); $result = array_reverse($input); $result_keyed = array_reverse($input, TRUE); ?> 这将使 $result 和 $result_keyed 具有相同的单元,但是注意键名的区别,$result 和 $result_keyed 的打印输出显示分别为: Array ( [0] => Array ( [0] => green [1] => red ) [1] => 4 [2] => php ) Array ( [2] => Array ( [0] => green [1] => red ) [1] => 4 [0] => php ) 例子,在PHP模板引擎中,模板文件: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>{$web_tile}</title> //开源软件:phpfensi.com </head> <body> {$article_title} <br/> -- by {$author} <hr/> <br/> {$content} <br/> -- publish @ {$time} <br/> <br/> foreach test: {foreach ( from=url key=b item=c )} <a href="index.php?artcle_id={==b}">{==c}</a> {/foreach} <br/> </body> </html> 解析引擎,代码如下: // var $pattern_var = "/{$left_tag}\\$([\w\d]+){$right_tag}/"; $replace_var = '<?php echo \$this->var_tpl_arr["$1"];?>'; if (preg_match($pattern_var, $content)) { $content = preg_replace($pattern_var, $replace_var, $content); } // foreach preg_match_all("/{$left_tag}foreach\s+([^{]+?){$right_tag}/is", $content, $match_foreach); if (isset($match_foreach[1]) && is_array($match_foreach)) { foreach($match_foreach[1] as $match_key => $match_value) { $split_foreachs = array_filter(preg_split('/\s+/is', $match_value)); $new_foreach_tag = array(); foreach($split_foreachs as $split_foreach) { $split = explode("=", $split_foreach); if (count($split == 2)) { if(in_array($split[0], array("from","item","key"))) { //过滤标签 不存在过滤 $new_foreach_tag[$split[0]] = $split[1]; } } } $from = $key = $item = ''; extract($new_foreach_tag); $key = ($key) ? '$'.$key.' =>' : '' ; $replace_foreach = '<?php foreach($this->var_tpl_arr["'.$from.'"] as '.$key.' $'.$item.') { ?>'; $content = str_replace($match_foreach[0][$match_key], $replace_foreach, $content); } } $pattern_foreach = "/{$left_tag}\/foreach{$right_tag}/"; $replace_foreach = "<?php } ?>"; if (preg_match($pattern_foreach, $content)) { $content = preg_replace($pattern_foreach, $replace_foreach, $content); } // var in statement $pattern_var = "/{$left_tag}==([\w\d]+){$right_tag}/"; $replace_var = '<?php echo \$$1;?>'; if (preg_match($pattern_var, $content)) { $content = preg_replace($pattern_var, $replace_var, $content); } 解析后代码如下: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title><?php echo $this->var_tpl_arr["web_tile"];?></title> </head> <body> <?php echo $this->var_tpl_arr["article_title"];?> <br/> -- by <?php echo $this->var_tpl_arr["author"];?> <hr/> <br/> <?php echo $this->var_tpl_arr["content"];?> <br/> -- publish @ <?php echo $this->var_tpl_arr["time"];?> <br/> <br/> foreach test: <?php foreach($this->var_tpl_arr["url"] as $b => $c) { ?> <a href="index.php?artcle_id=<?php echo $b;?>"><?php echo $c;?></a> <?php } ?> <br/> </body> </html> 使用代码如下: <?php require_once 'core/YATP.class.php'; $app = new YATP(); date_default_timezone_set("Asia/Shanghai"); $app->is_cache = false; $article_title = "yet,it is a simple template engine"; $author = "sanwhiteyu@tencent.com"; $web_tile = "just test "; $content = "It is easy to write a simple template engine for yourself,what u can do is try to do it!"; $time = date("Y-m-d H:i:s",time()); $url = array( "url1"=>"http://www.phpfensi.com", "url2"=>"http://www.phpfensi.com", ); $app->assign("article_title",$article_title); $app->assign("author",$author); $app->assign("web_tile",$web_tile); $app->assign("content",$content); $app->assign("time",$time); $app->assign("url",$url); $app->display("index.html"); // end of script ?> (编辑:开发网_郴州站长网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |