Html存在字符前的制表符

问题描述：

I am printing some names in PHP. However is always exist a tab character at the begin and end of string . How can I remove the tab character. Here is my code, it still cannot remove the extra tab.

<strong>
    <?php 
       for ($i=0;$i <count($countrys);$i++){
             $country = preg_replace('/[\s]+/mu', ' ', $countrys[$i]);
             $country = trim($country);
             echo $country;
                  if ($i != count($countrys)-1){
                    echo ', ';
                  }
          }
    ?>
</strong>

The outcome of the printing is like this.

    "  China, England, USA   "

我在PHP中打印一些名称。但是，在字符串的开头和结尾始终存在制表符。如何删除制表符。这是我的代码，它仍然无法删除额外的标签。 p>

 ＆lt; strong＆gt; 
＆lt;？php 
 for（$ i = 0; $ i＆lt;  count（$ countrys）; $ i ++）{
 $ country = preg_replace（'/ [\ s] + / mu'，''，$ countrys [$ i]）; 
 $ country = trim（$ country）;  
 echo $ country; 
 if（$ i！= count（$ countrys）-1）{
 echo'，'; 
} 
} 
？
？＆gt; 
＆lt; / strong＆gt;  
  code>  pre> 
 
 打印结果如下。 p> 
 
 
 “China，England，USA”
   pre> 
  div>

答

Be careful the space between html Tag and php code, browser will read the space between html tag and php echo

So just render it in one row

<strong><?php $countrys = ['a','v']; for ($i=0;$i<count($countrys);$i++){ $country = $countrys[$i]; echo $country; if ($i != count($countrys)-1){ echo ', '; } } ?></strong>

You can simply to check your raw html source after rendering to prevent unexpected space or row

Html存在字符前的制表符

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