如何設置特殊字符的substr？

Question

我怎麼能substr一個文本執行htmlspecialchars它。

保存在數據庫

some text " some text " some text 
' some text ' some text 'some text' some text ' 
some text 'some text ' some text ' some text ' 

與用htmlspecialchars（我想substr從此文本）

some text " some text " some text ' some text ' some text ' some text ' 
some text ' some text ' some text ' some text ' some text ' 

當SUBSTR：

some text " some text " some text ' some text � 

坦克

UPDATE

我用這個

if(strlen($text)>100){ 
    $s = html_entity_decode($text); 
    $shorten = substr($s,0,50); 
    echo htmlentities($shorten); 
    } 

，只是改變"

Answer 1

前SUBSTR嘗試decode和encode後：

$str = htmlentities(
    substr(html_entity_decode($str, ENT_QUOTES),0,50) 
,ENT_QUOTES); 

Test at eval.in（鏈接即將到期）