About thinkPHP's built-in string interception function

This article mainly introduces the usage of thinkPHP's built-in string interception function. It analyzes the function and specific usage of thinkPHP's built-in string interception function in the form of examples, as well as the source code modification techniques for unable to add ellipses. Friends in need can refer to it. Next

The example in this article describes the usage of thinkPHP's built-in string interception function. Share it with everyone for your reference, the details are as follows:

thinkphp has a built-in template engine that is comparable to smarty, which brings us great convenience. The same goes for calling functions. You can call the functions you need just like smarty, and the official has built-in some commonly used functions for everyone to call.

For example, the string interception function we are talking about today can be written like this in the thinkphp template engine: {$vo.title|msubstr=0,5,'utf-8′,false} As for {$vo. title}Everyone must be familiar with this. Let’s talk about the following function msubstr. What it means is to intercept the string $vo.title, starting from 0 characters and intercepting 5 characters. UTF-8 encoding is used, and the ellipsis is not displayed after interception by default. If you want to display the ellipsis, just change false to true.

Function explanation:

msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)

## Parameter function:

$str: String to be intercepted $start=0: Starting position, default starts from 0
$length: Interception length
$charset="utf-8": Character encoding, default UTF -8
$suffix=true: Whether to display an ellipse after the intercepted character, the default is true to display, false to not display

ps: If not If it is called normally, it means that you have not loaded the function library. You can use Load('extend'); to load the function and just put it in the action~!

function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true)
{
  if(function_exists("mb_substr")){
    if($suffix)
       return mb_substr($str, $start, $length, $charset)."...";
    else
       return mb_substr($str, $start, $length, $charset);
  }
  elseif(function_exists('iconv_substr')) {
    if($suffix)
       return iconv_substr($str,$start,$length,$charset)."...";
    else
       return iconv_substr($str,$start,$length,$charset);
  }
  $re['utf-8']  = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
  $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
  $re['gbk']  = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
  $re['big5']  = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
  preg_match_all($re[$charset], $str, $match);
  $slice = join("",array_slice($match[0], $start, $length));
  if($suffix) return $slice."…";
  return $slice;
}

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