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//µÚÒ»ÖÖ·½Ê½
exec($cmd,$str,$result);
echo "result = $result <br/>";
if ($result != 0) {
    echo "failed";
}
print_r($str);
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//µÚ¶þÖÖ·½Ê½
$output = shell_exec("/usr/bin/sudo /usr/bin/whoami 2>&1);
echo "output = $output";
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Defaults requiretty
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apache ALL = (root) NOPASSWD: /usr/bin/whoami


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function toFixLen($str,$len){ //¹Ì¶¨³¤¶È×Ö·û´®µÄ½ØÈ¡   
  
    if($len>=strlen($str)||!$len) return $str;   
  
    $len-=3;   
  
  ......

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?>

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$query = $this->db->query('SELECT name, title, email from my_table');
foreach ($query->result() as $row)
{
echo $row->title;
echo $row->name;
echo $row->email;
}
2.
foreach ($query->result_array() as $row)
{
echo $row['title'];
echo $row['name'];
ech ......
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