php explode选择多选

Question

I want divide these html as serval several part. One <h2> or <h3> with some <p> and <span> as one part. I tried explode array('<h2>','<h3>'), but it caused Warning. the explode not support multi choose.

So how to do it perfectly? Thanks.

$text=<<<EOT
<h2>title1</h2>
<p>something</p>
<span>something</span>
<h3>title2</h3>
<p>something</p>
<p>something</p>
<p>something</p>
<h2>title3</h2>
<span>something</span>
<h2>title4</h2>
<span>something</span>
<p>something</p>
<p>something</p>
EOT;

foreach ($text as $result) { 
    $arr = explode(array('<h2>','<h3>'),$result);
    reset($arr); 
    foreach($arr as $line){
        echo $line.'<hr />';
    } 
}

Warning: Invalid argument supplied for foreach() on line 23;

My expected output is:

<h2>title1</h2>
<p>something</p>
<span>something</span>
___________________________
<h3>title2</h3>
<p>something</p>
<p>something</p>
<p>something</p>
___________________________
<h2>title3</h2>
<span>something</span>
___________________________
<h2>title4</h2>
<span>something</span>
<p>something</p>
<p>something</p>
___________________________

Answer 1

You can use preg_split() to explode at different things. You can use RegEx here:

$text = <<<EOT
<h2>title1</h2>
<p>something</p>
...
EOT;

$arr = preg_split("#(?=<h[23]>)#", $text);

if(isset($arr[0]) && trim($arr[0])=='') array_shift($arr); // remove first block if empty

foreach($arr as $block){
    echo $block."<hr />
";
}