PHP collection plug-in QueryList practical teaching (1)

1: Demand background

As a developer, you will more or less encounter the need for collection in daily development, and you need to collect data, articles, etc. from a certain website. etc. At the same time, it is also necessary to analyze and classify the collected content. In the process of parsing and classifying, most PHPers use regular methods to analyze the crawled data, which increases the difficulty and does not improve the efficiency. Using QueryList can solve the problem of results very easily.

2: What is QueryList?

QueryList is an open source project based on phpQuery, which allows PHPer to perform a JQuery-like DOM operation on the content when collecting information. It is very simple and convenient, and fits the usual development habits.

3: Download and install

(1) Environmental requirements, there are two installation methods, you can select any of the following.

PHP >= 5.3

(2) Installation method - Use composer to install

composer require jaeger/querylist:V3.2.1

or add the following configuration to the composer.json file of the project, and then composer update

"require" : {
  "jaeger/querylist": "^3.2"
}

After the installation is completed, In the project, directly introduce the vendor/autoload.php file and start using it directly

(3) Test

$html = <<<STR
<div id="one">
    <div class="two">
        <a href="http://querylist.cc">QueryList官网</a>
        <img src="http://querylist.com/1.jpg" alt="这是图片">
        <img src="http://querylist.com/2.jpg" alt="这是图片2">
    </div>
    <span>其它的<b>一些</b>文本</span>
</div>        
STR;
        $rules = array(
            //采集id为one这个元素里面的纯文本内容
            &#39;text&#39; => array(&#39;#one&#39;,&#39;text&#39;),
            //采集class为two下面的超链接的链接
            &#39;link&#39; => array(&#39;.two>a&#39;,&#39;href&#39;),
            //采集class为two下面的第二张图片的链接
            &#39;img&#39; => array(&#39;.two>img:eq(1)&#39;,&#39;src&#39;),
            //采集span标签中的HTML内容
            &#39;other&#39; => array(&#39;span&#39;,&#39;html&#39;)
        );

        $data = QueryList::Query($html, $rules)->data;
        var_dump($data);

(4) Installation method-manual installation

Go to Github Download the code https://github.com/jae-jae/QueryL, get the two files QueryList.php and phpQuery.php and put them into the project

(5) Test

<?php
require &#39;phpQuery.php&#39;;
require &#39;QueryList.php&#39;;

use QL\QueryList;

$hj = QueryList::Query(&#39;https://php.cn/&#39;,array("url"=>array(&#39;.unit h1 a&#39;,&#39;href&#39;)));

$data = $hj->getData(function($x){
    return $x[&#39;url&#39;];
});

print_r($data);

Summary, downloading and installing this plug-in is very simple. In the next issue, I will introduce simple collection of article content, which is suitable for beginners to learn. Everyone is welcome to pay attention and receive new course reminders in time.

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