警告：explode（）期望参数2为字符串 - 错误

问题描述：

I need help understanding this error, just starting out ;)

Could this part of code cause the error in the subject?

$var = explode(',', $var);

I'm guessing exploding $var would need it's own variable, for example:

$myvar = explode(',', $var);

I need to understand as the first code did work on my server without warning, but my co-worker is getting the above warning.

我需要帮助理解这个错误，刚开始;） p>

可能这部分代码导致主题中的错误？ p>

  $ var = explode（'，'，$ var）; 
  code>  pre> 
  
 我猜测爆炸$ var需要它自己的变量，例如： p> 
 
 
  $ myvar = explode（'，'，$ var）; 
   code>  pre> 
 
 我需要理解，因为第一个代码在没有警告的情况下在我的服务器上运行，但是我的同事正在收到上述警告。 p> 
   DIV>

答

Your initial concern that you can not overwrite $var with explode(',',$var) is wrong since PHP is able to change the type of $var. This code adjustment however should lead you closer to where your problem is.

<?php

if(!is_string($var)) {
  echo "
$var contains:";
  var_dump($var);
  die('as you can see, var is not a string');
}
elseif(stripos($var,',') == FALSE) {
  echo "
$var contains:";
  var_dump($var);
  die('var is a string but has no commas');
}
else {
  $var = explode(',', $var);
  echo "
now $var contains:";
  var_dump($var);
  die();
}

Also, as mentioned, RTM and check out how explode works.

警告：explode（）期望参数2为字符串 - 错误

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