如何使用PHP preg_replace正則表達式來查找和替換文本？

Question

我寫這個PHP代碼進行一些換人：

function cambio($txt){ 
    $from=array(
     '/\+\>([^\+\>]+)\<\+/', //finds +>text<+ 
     '/\%([^\%]+)\%/', //finds %text% 
    ); 

    $to=array(
     '<span class="P">\1</span>', 
     '<span>\1</span>', 
    ); 

    return preg_replace($from,$to,$txt); 
} 

echo cambio('The fruit I most like is: +> %apple% %banna% %orange% <+.'); 

所得到這一點：

The fruit I most like is: <span class="P"> <span>apple</span> <span>banna</span> <span>orange</span> </span>. 

但是我需要找出水果的跨度標籤，就像這樣：

The fruit I most like is: <span class="P"> <span class="t1">apple</span> <span class="t2">banana</span> <span class="t3">coco</span> </span>. 

我會買一個水果，發現一個正則表達式來完成這個:-)

---

白衣澤維爾巴博薩的幫助下，我來到了這最後sollution：

function matches($matches){ 
    static $pos=0; 
    return sprintf('<span class="t%d">%s</span>',++$pos,$matches[1]); 
} 

function cambio($txt){//Markdown da Atípico : Deve ser usado depois do texto convertido para markdown 
    $from=array(
     '/\=>(.+?)<\=/', //finds: =>text<= 
     '/\+>(.+?)<\+/', //finds +>text<+ 
    ); 

    $to=array(
     '<span class="T">\1</span>', 
     '<span class="P">\1</span>', 
    ); 

    $r=preg_replace($from,$to,$txt); 
    return preg_replace_callback('/%(.*?)%/','matches',$r);//finds %text% 
    //'/%((\w)\w+)%/' //option 
} 

Answer 1

<?php 


function cambio($txt){ 
    $from=array(
     '/\+>(.+?)<\+/', //finds +>text<+ 
     '/%((\w)\w+)%/', //finds %text% 
    ); 

    $to=array(
     '<span class="P">\1</span>', 
     '<span class="\2">\1</span>', 
    ); 

    return preg_replace($from,$to,$txt); 
} 

echo cambio('The fruit I most like is: +> %apple% %banna% %orange% <+.'); 

而且有狀態版本PHP5.3

function cambio($txt) { 
    return preg_replace_callback('/\+>(.+?)<\+/', function ($matches) { 
     $txt = sprintf('<span class="P">%s</span>', $matches[1]); 

     return preg_replace_callback('/%(\w+)%/', function ($matches) { 
      static $pos = 0; 
      return sprintf('<span class="t%d">%s</span>', ++$pos, $matches[1]); 
     }, $txt); 

    }, $txt); 
} 

echo cambio('The fruit I most like is: +> %apple% %banna% %orange% <+.'); 

Answer 2

試試這個：

function cambio($txt){ 
    $from=array(
     '/\+\>([^\+\>]+)\<\+/', //finds +>text<+ 
     '/\%(^\%)([^\%]+)\%/', //finds %text% 
    ); 

    $to=array(
     '<span class="P">\1</span>', 
     '<span class="\1">\1\2</span>', 
    ); 

    return preg_replace($from,$to,$txt); } 

echo cambio('The fruit I most like is: 
+> %apple% %banna% %orange% <+.');