Extension plug-in for for loop in smarty template_PHP tutorial-PHP Tutorial-php.cn

Extension plug-in for for loop in smarty template_PHP tutorial

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Release： 2016-07-13 10:31:00

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Smarty is a very popular template in PHP development. I have previously published an article on the PHP smarty Chinese interception plug-in development example to explain how to develop a smarty plug-in. This article will share how to do it for the smarty template. A for loop extension plug-in for our daily program development.

First, let’s talk about what this for loop expansion is used for. Today when I was renovating a previous website, I needed to make a for loop in the smarty template for some specific reasons. Although smarty can be used in the template in the form of {php}...{/php} tags Directly write PHP statement syntax. But since the value of the variable in the template is used in the loop, and the PHP statement written directly in the template cannot obtain the value of the template variable, this idea will not work. Finally, I thought about whether it can also be implemented in smarty. What about using for loops directly in templates?

The following are the specific steps for the author to add a for loop extension plug-in to smarty.

(1)Create a new file in the plugins directory under the installation directory of the smarty template, name it block.for.php, and then enter the following code in this file:

<?php
function smarty_block_for($params,$content,&$smarty){
	if(is_null($content)){
		return;
	}
	$start=0;
	$to=0;
	$step=1;
	foreach($params as $k=>$v){
		switch($k){
			case 'start':
			case 'to':
			case 'step':
				$$k=(int)$v;
			break;
			default:
				$smarty->trigger_error("textformat: 未知属性:'$k'");
		}
	}
	$_output='';
	for($_x=$start;$_x<=$to;$_x+=$step){
		$_output.=$content."\n\r";
	}
	return $_output;
}

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(2)Then you can use the for loop directly in the smarty template. The author’s use case is as follows:

php file part code:

$vote='[[[';//我要在模板中将这三个符号转变为三个五角星图片
$smarty->assign('vote',$vote);

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Part of the smarty template file code:

{if false!==$vote|@stripos:'['}
{for start=1 to=$vote|@strlen step=1}
<img src="http://www.phpernote.com/images/xing.gif" />
{/for}
{/if}

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ok, the above problem is solved. Much the same, if you need to extend more functions for smarty, the method is the same as above, and it can basically be achieved.

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