Yii系列總結：截取字元串方法

1.先建立一個檔案 Helper.php，内容如下：

--------------------------------------------------------------------------

<?php
class Helper extends CController
{
   public static function truncate_utf8_string($string, $length, $etc = '...')
   {
       $result = '';
       $string = html_entity_decode(trim(strip_tags($string)), ENT_QUOTES, 'UTF-8');
       $strlen = strlen($string);
       for ($i = 0; (($i < $strlen) && ($length > 0)); $i++)
       {
       if ($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0'))
           {
           if ($length < 1.0)
               {
           break;
           }
           $result .= substr($string, $i, $number);
           $length -= 1.0;
           $i += $number - 1;
       }
           else
           {
           $result .= substr($string, $i, 1);
           $length -= 0.5;
       }
       }
       $result = htmlspecialchars($result, ENT_QUOTES, 'UTF-8');
       if ($i < $strlen)
       {
       $result .= $etc;
       }
       return $result;
   }
}
   ?>----------------------------      

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2.将Helper.php放進protected\components檔案夾下。

這個函數truncate_utf8_string($string, $length, $etc = '...')的3個參數很容易看出來。

Helper::truncate_utf8_string($content,20,false);   //不顯示省略号
   Helper::truncate_utf8_string($content,20);  //顯示省略号即：'content'=>array(
           'value'=>'Helper::truncate_utf8_string($data->content,40,false)',
       ),
舉個例子。<?php $this->widget('zii.widgets.grid.CGridView',array(
   'id'=>'news-grid',
   'dataProvider'=>$dataProvider,
   //'filter'=>$model,
   'columns'=>array(
       'id',
       'title',
       'content'=>array(
           'value'=>'Helper::truncate_utf8_string($data->content,40,false)',),
       'author',
       'create_time',
       'status',
       array(
           'class'=>'CButtonColumn',
       ),
   ),
)); ?>