PHP数组foreach遍历输出例子详解
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>
</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.phprm.com",
"url2"=>"http://www.phprm.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文章地址:http://www.phprm.com/shuzu/fs9025.html
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