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$str = '<a id="top8" href="http://list.mp3.baidu.com/song/A.htm?top8" class="p14" target="_top">¸èÇúÁбí</a><br><a target="_blank" id="bp" href="http://list.mp3.baidu.com/list/bangping.html" class="p14">ÖÐÎĽðÇú°ñ</a><br><td nowrap="nowrap">&#8226;&nbsp;<a id="top19" href="qingyinyue.html?top19" class="p14" target="_top">ÇáÒôÀÖ</a></td>'; copyright dedecms
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$pat = '/<a(.*?)href="(.*?)"(.*?)>(.*?)<\/a>/i';
preg_match_all($pat, $str, $m);
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print_r($m[2]);
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for($i=0;$i<count($m[2]) ;$i++ ){
    echo '<li><a href="'.$_SERVER['PHP_SELF'].'?url='.$m[2][$i].'">'.$m[4][$i].'</a>';
}
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$a="hello"; 
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$b="world"; 
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$str="cd"; 
  $$str="landog";  
$$str.="ok";
echo $cd;
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<?php
$a = "hello";
$b =&$a;
unset($b);
echo '$a:'.$a;
//output:$a:hello
?> ......

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cd /home/wj
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¡¡¡¡mv httpd-2.0.54 apache
¡¡¡¡cd apache
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