PHP數組foreach遍曆輸出例子詳解

最後更新：2017-01-13 來源：互聯網

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簡單的一個php數組函數，之前沒這個需要一直都不知道有這麼一個函數，擦汗...

php數組逆序輸出代碼

代碼如下	複製代碼
foreach(array_reverse($array) AS $key=>$value){ echo $value.' '; }

array_reverse
(PHP 4, PHP 5)
array_reverse — 返回一個單元順序相反的數組

說明

array array_reverse ( array $array [, bool $preserve_keys ] )
array_reverse() 接受數組 array 作為輸入並返回一個單元為相反順序的新數組，如果 preserve_keys 為 TRUE 則保留原來的鍵名。

Example #1 array_reverse() 例子

代碼如下	複製代碼
<?php $input = array("php", 4.0, array("green", "red")); $result = array_reverse($input); $result_keyed = array_reverse($input, TRUE); ?>

這將使 $result 和 $result_keyed 具有相同的單元，但是注意鍵名的區別。$result 和 $result_keyed 的列印輸出顯示分別為：
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

模板檔案：

代碼如下

複製代碼

<!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}
 
-- by {$author}
<hr/>
 
{$content}
 
-- publish @ {$time}

foreach test:

{foreach ( from=url key=b item=c )}
<a href="index.php?artcle_id={==b}">{==c}</a>
{/foreach}

</body>
</html>

解析引擎：

代碼如下

複製代碼

// 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"))) {
//過濾標籤不存在過濾
 $new_foreach_tag[$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);
 }

解析後：

代碼如下

複製代碼

<!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"];?>
 
-- by <?php echo $this->var_tpl_arr["author"];?>
<hr/>
 
<?php echo $this->var_tpl_arr["content"];?>
 
-- publish @ <?php echo $this->var_tpl_arr["time"];?>

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 } ?>

</body>
</html>

使用：

代碼如下

複製代碼

<?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.111cn.net",
"url2"=>"http://www.111cn.net",
);

$app->assign("article_title",$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

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