Strlen没有给出正确的输出

Question

我有一个字符串，我从数据库中检索，我想计算字符串的长度没有空格，但它显示一个较大的长度值（比实际计数大21个字符）I已经删除了标签和换行符以及php和html标签，但没有结果！我已经尝试了几乎w3schools php参考的所有功能，但是我无法找到任何成功。我还观察到，如果我不从数据库中检索输入值这样的：

$string = "my string";

我得到正确的长度，请帮助我。下面是代码：

if($res_tutor[0]['tutor_experience']){ 
     $str = trim(strip_tags($res_tutor[0]['tutor_experience'])); 
      $str = $this->real_string($str); 
      $space = substr_count($str, ' '); 
      $experience = strlen($str) - $space; 


function real_string($str) 
{ 
    $search = array("\t","\n","\r\n","\0","\v"); 
    $replace = array('','','','',''); 
    $str = str_replace($search,$replace,$str); 
    return $str; 
} 

这是从数据库中字符串，但你可以看到上面我已删除了使用strip_tags()所有php和html标签：

<span class=\"experience_font\">You are encouraged to write a short description of yourself, teaching experience and teaching method. You may use the guidelines below to assist you in your writing.<br /> 
    <br /> 
    .Years of teaching experience<br /> 
    .Total number of students taught<br /> 
    .Levels &amp; subjects that you have taught<br /> 
    .The improvements that your students have made<br /> 
    .Other achievements/experience (Relief teaching, a tutor in a tuition centre, Dean&#39;s list, scholarship, public speaking etc.)<br /> 
    .For Music (Gigs at Esplanade, Your performances in various locations etc.)</span><br /> 
    &nbsp;</p> 

，当我打印出来，它显示为：

<span class=\"experience_font\">You are encouraged to write a short description of yourself, teaching experience and teaching method. You may use the guidelines below to assist you in your writing.<br /> 
    <br /> 
    .Years of teaching experience<br /> 
    .Total number of students taught<br /> 
    .Levels &amp; subjects that you have taught<br /> 
    .The improvements that your students have made<br /> 
    .Other achievements/experience (Relief teaching, a tutor in a tuition centre, Dean&#39;s list, scholarship, public speaking etc.)<br /> 
    .For Music (Gigs at Esplanade, Your performances in various locations etc.)</span><br /> 
    &nbsp;</p> 

Answer 1

@Svetilo，不粗鲁只是想后我发现，你的str_replace工作很好，除了我仍然按照你现在的顺序输出不正确的值，我发现以下工作完美无缺。

$string = str_replace(array("\t","\r\n","\n","\0","\v"," "),'', $string); 
mb_strlen($string, "UTF-8"); 

围绕\ r \ n & \将N-所作的str_replace函数不去掉从\ r \ n离开它只是一个\ r成\ n。

干杯。

Answer 2

尝试使用mb_strlen。 http://php.net/manual/en/function.mb-strlen.php 它更精确。

mb_strlen($str,"UTF-8") 

凡UTF-8是你的默认编码... 要删除所有空格自由尝试类似的东西..

$string = str_replace(array("\t","\n","\r\n","\0","\v"," "),"",$string); 
mb_strlen($string, "UTF-8");