CODEWITHSUNDEEP
php
Nicky Smits
Nicky Smits

Reputation: 3138

Download List of Files Simultaneously in PHP

With PHP I create an array of a CSV file containing URLs to files I want to download with this line:

$urls = explode(',',file_get_contents('urls.csv'));

After this is done, I use the following block of code.

foreach($urls as $url){
    $fname = 'not important right now ;)'
    $fcon = fopen($fname,'w');
    fwrite($fcon,file_get_contents($url));
    fclose($fcon);
}

This works great, it downloads all the files in the file!

But unfortunately, it is not as efficient as I would want it. I want 2,3 or maybe 4 simultaneous downloads to save myself some time. How can i do this?

Upvotes: 4

Views: 2303

Answers (1)

FuzzyTree
FuzzyTree

Reputation: 32392

If you have access to curl you can use curl_multi_exec. First chunk your $urls array into groups of how many you want to execute simultaneously, then process each group using curl_multi_exec.

$all_urls = ['http://www.google.com',
'http://www.yahoo.com',
'http://www.bing.com',
'http://www.twitter.com',
'http://www.wikipedia.org',
'http://www.stackoverflow.com'];

$chunked_urls = array_chunk($all_urls,3); //chunk into groups of 3

foreach($chunked_urls as $i => $urls) {

    $handles = [];    
    $mh = curl_multi_init();  
    
    foreach($urls as $url) {
        $ch = curl_init($url);  
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_multi_add_handle($mh, $ch);
        $handles[] = $ch;
    }
    
    // execute all queries simultaneously, and continue when all are complete
    $running = null;
    do {
        curl_multi_exec($mh, $running);
    } while ($running);
    
    foreach($handles as $handle) {
        file_put_contents("/tmp/output",curl_multi_getcontent($handle),FILE_APPEND);
        curl_multi_remove_handle($mh, $handle);        
    }
    
    curl_multi_close($mh);
    
    print "Finished chunk $i\n";
}

Upvotes: 6

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