我把巡洋舰的TAG处理方法改了一下。改为用空格切分字符串 [ 技术分享 ]

<?php
// 全角半角转．
function make_semiangle($str)   
{   
  $arr = array('０' => '0', '１' => '1', '２' => '2', '３' => '3', '４' => '4',   
    '５' => '5', '６' => '6', '７' => '7', '８' => '8', '９' => '9',   
    'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D', 'Ｅ' => 'E',   
    'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I', 'Ｊ' => 'J',   
    'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N', 'Ｏ' => 'O',   
    'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S', 'Ｔ' => 'T',   
    'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X', 'Ｙ' => 'Y',   
    'Ｚ' => 'Z', 'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd',   
    'ｅ' => 'e', 'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i',   
    'ｊ' => 'j', 'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n',   
    'ｏ' => 'o', 'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's',   
    'ｔ' => 't', 'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x',   
    'ｙ' => 'y', 'ｚ' => 'z',   
    '（' => '(', '）' => ')', '〔' => '[', '〕' => ']', '【' => '[',   
    '】' => ']', '〖' => '[', '〗' => ']', '“' => '[', '”' => ']',   
    '‘' => '[', '’' => ']', '｛' => '{', '｝' => '}', '《' => '<',   
    '》' => '>',   
    '％' => '%', '＋' => '+', '—' => '-', '－' => '-', '～' => '-',   
    '：' => ':', '。' => '.', '、' => ',', '，' => '.', '、' => '.',   
    '；' => ',', '？' => '?', '！' => '!', '…' => '-', '‖' => '|',   
    '”' => '"', '’' => '`', '‘' => '`', '｜' => '|', '〃' => '"',   
    '　' => ' ','＄'=>'$','＠'=>'@','＃'=>'#','＾'=>'^','＆'=>'&','＊'=>'*',
    '＂'=>'"');
   
  return strtr($str, $arr);   
}


$string = "This is　an　example　st ring";
$strlower=strtolower($string);
$strms=make_semiangle($strlower);
echo $strms."<br><br>"; 
$tok = strtok($strms, " ");

while ($tok !== false) {
    echo "Word=$tok<br />";
    $tok = strtok(" ");
}