PHP class method with closure CURL headers

Question

I have the class below, in order to analyze a URL

<?php
class URLFetcher {
    private $ch;
    private $url = '';

    public function __construct(string $url) {
        $this->url = $url;
    }

    public function fetch(): URLFetcher {
        $headers = [];
        $this->ch = curl_init($this->url);
        curl_setopt_array($this->ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0',
            CURLOPT_HEADERFUNCTION => function($curl, $header) use (&$headers) {
                var_dump($header);
                $header2 = trim($header);
                if($header2 !== '') $headers[] = $header2;
                return strlen($header);
            }
        ]);
        exit(var_dump($headers));
        return $this;
    }
}
?>

I use var_dump in the closure in order to see the headers, as they come from CURL, and at the end, I use var_dump again in order to see all headers.

The problem is that there are no headers printed in the function and at the end, the $headers is printing the empty array.

If I do this without the class, everything works correctly. My question is what am I missing and the code does not work? I hypothesize that it has to do with the closure.

cn7r66 · Accepted Answer · 2019-01-28 15:36:30Z

1

You simply forgot curl_exec($this->ch); at the end of the method.

public function fetch(): URLFetcher {
    $headers = [];
    $this->ch = curl_init($this->url);
    curl_setopt_array($this->ch, [
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0',
        CURLOPT_HEADERFUNCTION => function($curl, $header) use (&$headers) {
            $header2 = trim($header);
            if($header2 !== '') $headers[] = $header2;
            return strlen($header);
        }
    ]);

    curl_exec($this->ch);

    exit(var_dump($headers));
    return $this;
}

answered Jan 28, 2019 at 15:36

cn7r66

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1 Comment

Alexios Tsiaparas Over a year ago

Oh mon dieu!!! Damn copy paste. I feel a little embarassed, suppose I should :) Thanks anyway

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