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About how to remove width and height styles in PHP using regular expressions

jacklove

Jun 08, 2018 pm 05:12 PM

phpregular

Due to work needs, it is necessary to collect html and save the html content into the database. In order to avoid affecting usage, the width and height styles need to be deleted. For example, width, height, etc. in pictures and p.

However, in the collected HTML, the styles are written differently, such as upper and lower case, spaces in the middle, etc.

So I wrote the following method using PHP regular to filter these weird styles.

The code is as follows:

<?php/**
 * 清除宽高样式
 * @param  String $content 内容
 * @return String
 */function clear_wh($content){
    $config = array(&#39;width&#39;, &#39;height&#39;);    foreach($config as $v){        $content = preg_replace(&#39;/&#39;.$v.&#39;\s*=\s*\d+\s*/i&#39;, &#39;&#39;, $content);        $content = preg_replace(&#39;/&#39;.$v.&#39;\s*=\s*.+?["\&#39;]/i&#39;, &#39;&#39;, $content);        $content = preg_replace(&#39;/&#39;.$v.&#39;\s*:\s*\d+\s*px\s*;?/i&#39;, &#39;&#39;, $content);
    }    return $content;
}?>

Demo:

<?php$html = <<<HTML
<p style="text-align:center" width="500" height="300">
    <p style="Width : 100px ; Height: 100 px;">
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"      style="max-width:90%"About how to remove width and height styles in PHP using regular expressions" >
        <p style="float:left; width: 100px; height : 200 px;"></p>
    </p>
    <p style="width :   100 px ;height: 100px">
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"      style="max-width:90%"About how to remove width and height styles in PHP using regular expressions" >
    </p>
</p>
HTML;echo &#39;<xmp>&#39;;echo &#39;原内容：&#39;.PHP_EOL;echo $html.PHP_EOL.PHP_EOL;echo &#39;过滤后内容：&#39;.PHP_EOL;echo clear_wh($html);echo &#39;</xmp>&#39;;
?>

Output:

原内容：<p style="text-align:center" width="500" height="300">
    <p style="Width : 100px ; Height: 100 px;">
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"      style="max-width:90%"About how to remove width and height styles in PHP using regular expressions" >
        <p style="float:left; width: 100px; height : 200 px;"></p>
    </p>
    <p style="width :   100 px ;height: 100px">
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"      style="max-width:90%"About how to remove width and height styles in PHP using regular expressions" >
    </p></p>过滤后内容：<p style="text-align:center"  >
    <p style=" ">
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"    alt="About how to remove width and height styles in PHP using regular expressions" >
        <p style="float:left;  "></p>
    </p>
    <p >
        <img  src="/static/imghwm/default1.png"  data-src="/images/test.jpg"  class="lazy"    alt="About how to remove width and height styles in PHP using regular expressions" >
    </p></p>

This article explains how to use regular rules to remove width and height styles in PHP. For more related content, please pay attention to the PHP Chinese website.

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