Detailed explanation of usage and examples of built-in variable mediator in PHP template engine Smarty

This article mainly introduces the usage of the built-in variable mediator in PHP template engine Smarty. It analyzes the definition and usage skills of commonly used built-in variable mediators in Smarty in detail with examples. Friends in need can refer to it

The variable mediator in Smarty is equivalent to a function, and its calling method is: directly followed by the mediator function name through "|". If there are parameters, they must be added after ":". If there are multiple parameters, they can be accumulated.

The following introduces you to the built-in variable mediator in Smarty:

1. capitalize

Change the first letter of all words in the variable capital. The parameter value is a boolean type that determines whether the first word of a word with numbers is capitalized. The default is not capitalized

index.php

$tpl->assign('str', 'hello world wor2ld!!!');
$tpl->display('index.html');

index.html (template file)

<{$str|capitalize}>
<{$str|capitalize:true}>

The result is: Hello World wor2ld!!!, Hello World Wor2Ld!!!

2, count_characters

Calculate the number of characters in the variable , the mediator does not count spaces (spaces, tabs, carriage returns...) by default, only counts the number of characters, and can well support Chinese character calculations; if the parameter true is added, spaces will be counted.

index.html

<{$str|count_characters}> // 不计算空格
<{$str|count_characters:true}> // 计算空格

The results are: 13, 14

3, cat

Connect the string and connect the value in cat to the given variable.

<{$str|cat:&#39; Happy new year.&#39;}>

The result is: hello world!!! Happy new year.

4、count_paragraphs

Calculate the number of paragraphs, calculate the number of paragraphs in the variable, and perfectly support Chinese paragraphs.

index.php

$str = <<assign(&#39;str&#39;, $str);
$tpl->display(&#39;index.html&#39;);

index.html

<{$str|count_paragraphs}>

The result is: 3

5, count_sentences

Count the number of sentences and count the number of sentences in the variable. Note: Only English sentences are supported, Chinese is not supported.

index.php

$str = <<assign(&#39;str&#39;, $str);

index.html

<{$str|count_sentences}>

The result is: 2

6, count_words

Calculate the number of words, count the number of words in the variable.

index.php

$str = <<assign(&#39;str&#39;, $str);

index.html

<{$str|count_words}>

The result is: 12

7, date_format

Date formatting, there are many specific parameters, here is only an example of Chinese date format

index.php

$tpl->assign('date', time()); // 传递时间戳

index.html

<{$date|date_format:&#39;%Y-%m-%d %H:%M:%S&#39;}>

The result is: 2012-01-26 14: 37:22

8, default

Default, set a default value for an empty variable. When the variable is empty or unallocated, the given default value will be used. Alternative output.

index.php

$tpl->assign('str', ''); // 赋值给空

index.html

<{$str|default:&#39;默认输出...&#39;}>、<{$string|default:&#39;没有定义，默认输出...&#39;}>

The result is: default output..., no definition, default output...

9, escape

transcoding, used for html transcoding, url transcoding , convert single quotes on variables without transcoding, hexadecimal transcoding, hexadecimal beautification, or javascript transcoding, the default is html transcoding

index.php

$html = <<Google
html;
$js = <<
  for (var i=0; i<100; i++) {
    window.alert(i);
  }
js;
$tpl->assign(&#39;html&#39;, $html); // html
$tpl->assign(&#39;url&#39;, &#39;http://www.google.com.hk&#39;); // url
$tpl->assign(&#39;js&#39;, $js); // javascript

index.html

HTML 转码：<{$html|escape:"html"}>
URL 转码：<{$url|escape:"url"}>
JS 转码：<{$js|escape:"javascript"}>

The result is:

HTML 转码：Google
URL 转码：http%3A%2F%2Fwww.google.com.hk
JS 转码：

10, indent

Indent, each line indents a string, the first parameter specifies how many strings to indent, the default is four characters; The second parameter specifies what character to use to replace the indentation.

11, lower

lowercase, lowercase the variable string.

Usage: <{$str|lower}>

12, upper

uppercase, change the variable to uppercase.

Usage: <{$str|upper}>

13, nl2br

Replace the newline character with

All newline characters will be replaced, the same as PHP's nl2br() function.

14. regex_replace

Regular replacement, finding and replacing regular expressions, has the same syntax as preg_replace().

index.php

$tpl->assign('str', 'http://www.google.com');

index.html

<{$str|regex_replace:&#39;/go{2}gle/&#39;:&#39;baidu&#39;}>

The result is: http://www.baidu.com

15, replace

, simple search and replace string.

16, spacify

Insert space, insert space (I don’t know what this word means, just as the name suggests ^^) is a method of inserting spaces into each character of a string Insert spaces or other characters (strings) between them.

index.php

$tpl->assign('str', 'hello world!!!');

index.html

<{$str|spacify:"^^"}>

The result is: h^^e^^l^^l^^o^^ ^^w^^o^^r^^l^^d^^!^^!^^!

17. string_format

String formatting is a method of formatting floating point numbers, such as decimal numbers. Use sprintf syntax to format.

index.php

$tpl->assign('num', 23.5787446);

index.html

<{$num|string_format:"%.2f"}>
<{$num|string_format:"%d"}>

The result is: 23.58, 23

18, strip

Replace all repeated spaces, newlines, and tabs into a single

index.php

$tpl->assign('str', "Grandmother of\neight makes\t  hole in one.");

index.html

<{$str|strip:" "}>

The result is: Grandmother of eight makes hole in one.

源代码：

Grandmother of eight makes hole in one.

19、strip_tags

去除在<和>之间的所有标签,包括<和>。

index.php

$tpl->assign('str', "Google");

index.html

<{$str|strip_tags}>

结果为：Google（源代码也是 Google，去掉了标签和标签）

20、truncate

截取，截取字符串开始的一段.默认是80个，你可以指定第二个参数作为在截取的那段字符串后加上什么字符，默认情况下,smarty会截取到一个词的末尾，如果你想要精确的截取多少个字符,把第三个参数改为"true" 。

index.php

复制代码 代码如下:

$tpl->assign('str', '从前有座山，山上有座庙。庙里有一个老和尚和一个小和尚...');

index.html

<{$str|truncate:10:&#39;...&#39;:true}>

结果为：从前有座山，山...

总结：以上就是本篇文的全部内容，希望能对大家的学习有所帮助。

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