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11 years ago
In 5.3.9+, curl_multi_select always returns -1. If this is your case, just wait a bit and then proceed like nothing ever happened:
<?php
do {  
    $mrc = curl_multi_exec($multi, $active);  
} while ($mrc == CURLM_CALL_MULTI_PERFORM);  
    
while ($active && $mrc == CURLM_OK) {
    //check for results and execute until everything is done

    if (curl_multi_select($multi) == -1) {
        //if it returns -1, wait a bit, but go forward anyways!
        usleep(100); 
    }
    
    //do something with the return values
    while(($info = curl_multi_info_read($multi)) !== false){
        if ($info["result"] == CURLE_OK){
            $content = curl_multi_getcontent($info["handle"]);
            do_something($content);
        }
    }
    do {  
        $mrc = curl_multi_exec($multi, $active);  
    } while ($mrc == CURLM_CALL_MULTI_PERFORM);          
}
?>
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