使用get_meta_tags函数时复制元描述，只需要描述

问题描述：

When echo'ed out instead of just removing all of the other meta tags it seems to be duplicating the description, for example:

BBC has 13 different meta tags, when I echo out just the description in my script it is duplicating it 13 times.

<?php
//make the array 
$TAarray = explode("
", strip_tags($_POST['TAData'])); 

foreach ($TAarray as $key => &$line) {
            $line = trim($line); 
            // get the meta data for each url
            $tags = get_meta_tags($line);

            echo '<tr>';
            foreach ($tags as $meta)        
            {
            echo (isset($tags['description']))?"<br><br       />
Description($line):<br>
".$tags['description']:"<br>
Description($line):<br>
No Meta    Description.";
                    /*echo '<td>' . $meta . '</td>';*/
            }
            echo '</tr>';
    }

    ?>

Here is the URL incase anyone wanted to see it working: http://php-playground.co.cc/testdir/metaex.php

I know the checkboxes are not working they are only there for the layout

当回显而不仅仅删除所有其他元标记时，它似乎是重复描述，例如： p>

BBC有13种不同的元标记，当我在我的脚本中只显示它的描述时，它会重复13次。 p>

 ＆lt;？php 
 //制作数组
 $ TAarray = explode（“
”，strip_tags（$ _ POST ['TAData']））;  
 
foreach（$ TAarray as $ key =＆gt;＆amp; $ line）{
 $ line = trim（$ line）;  
 //获取每个网址的元数据
 $ tags = get_meta_tags（$ line）; 
 
 echo'＆lt; tr＆gt;'; 
 foreach（$ tags as $ meta）
 {
 \ echo  （isset（$ tags ['description']））？“＆lt; br＆gt;＆lt; br />
Description($line):<br>
".$tags['description']:"<  br＆gt; 
描述（$ line）：＆lt; br＆gt; 
无元描述。“; 
 / * echo'＆lt; td＆gt;'  。  $ meta。  '＆lt; / td＆gt;'; * / 
} 
 echo'＆lt; / tr＆gt;'; 
} 
 
？＆gt; 
  code>  pre> 
 
 这是任何人都希望看到它工作的URL： http：// php-playground。  co.cc/testdir/metaex.php   p> 
 
 
 PS  p> 
 
 
我知道复选框不起作用它们仅用于布局  p> 
  div>

答

I think this is what you are trying to do:

<?php
//make the array 
$TAarray = explode("
", strip_tags($_POST['TAData'])); 

foreach ($TAarray as $key => &$line) {
            $line = trim($line); 
            // get the meta data for each url
            $tags = get_meta_tags($line);

            echo '<tr>';
            echo (isset($tags['description']))?"<br><br       />
Description($line):<br>
".$tags['description']:"<br>
Description($line):<br>
No Meta    Description.";
                   echo '<td>' . $tags['description'] . '</td>';
            echo '</tr>';
    }

    ?>

You'll note that have removed the second for loop.

答

You are looping over the meta tags, and for each meta tag you are echoing out the description.

Get rid of the loop.

答

If you use foreach with references, it's good practice to remove that reference after the loop:

foreach ($TAarray as $key => &$line)
{
    $line = trim($line); 
}
unset($line); # remove the reference for safety reasons

But as you don't iterate over $TAarray after that code, the code is superfluous anyway. Don't write superfluous code. I suggest the following:

//make the array 
$TAarray = explode("
", strip_tags($_POST['TAData'])); 
$TAarray = array_map('trim', $TAarray);

And I suggest you put that into a function of it's own:

/**
 * @param string $html
 * @return string[] lines
 */
function getTrimmedTextLinesArrayFromHTMLBlock($html)
{
    $text = strip_tags($html);
    $lines = explode("
", $text);
    $trimmed = array_map('trim', $lines);
    return $trimmed;
}

You can then use it wherever you see fit. You can also test this function independently with different input:

$lines = getTrimmedTextLinesArrayFromHTMLBlock($_POST['TAData']));
$whitelist = array("description");
foreach ($lines as $line)
{
    if (! $tags = get_meta_tags($line)) continue;
    echo '<tr>';
    foreach ($tags as $key => $meta)
    {
        if (! in_array($key, $whitelist)) continue;
        echo '<td>' . $meta . '</td>';
    }
    echo '</tr>';
}

I hope this is helpful.

使用get_meta_tags函数时复制元描述，只需要描述

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