Bug #74563 [Com]: curl_exec() throws internal error in curl_error()

Edit report at https://bugs.php.net/bug.php?id=74563&edit=1 ID: 74563 Comment by: jeremys at ha dot com Reported by: jeremys at ha dot com Summary: curl_exec() throws internal error in curl_error() Status: Open Type: Bug Package: cURL related Operating System: RHEL 7.3 PHP Version: 7.1.4 Block user comment: N Private report: N New Comment: I appreciate your skepticism as I was quite skeptical such an error could occur, too, but alas.. With the opcache.enable directive still set to 0, I changed the die in the anonymous error handler function to print 'Error occurred.', and still received the following output (note the different line number and additional string printed at the end): Array ( [0] => 2 [1] => curl_error() expects parameter 1 to be resource, boolean given [2] => /usr/local/apache/htdocs2/common/curl-error-test.php [3] => 18 ) Error occurred. Previous Comments: ------------------------------------------------------------------------ [2017-05-09 21:59:19] danack@php.net > I disabled opcache for the script by adding the following line to the top of the script: > ini_set( 'opcache.enable', 0 ); If the script is being cached, then editing the script won't make a difference. Please try editing what is being printed out in the error handler, to confirm the exact code you're reporting is causing the error. The reason I'm so sceptical about what code is making that error appear, is that the error message is one that is shown when userland code calls an internal function, but is very unlikely to appear due to how curl works internally. ------------------------------------------------------------------------ [2017-05-09 15:32:58] jeremys at ha dot com No Suhosin or other security modules are running/enabled. Do you need a particular part of the php.ini? I disabled opcache for the script by adding the following line to the top of the script: ini_set( 'opcache.enable', 0 ); And the error still occasionally happens. ------------------------------------------------------------------------ [2017-05-09 15:16:06] danack@php.net In fact - please can you just double check that you are seeing the error from the code you have listed here. I strongly suspect you have OPCache running and the error you are seeing is from code that has been cached in memory, rather than running the latest version of that file. ------------------------------------------------------------------------ [2017-05-09 15:04:57] danack@php.net Do you have Suhosin or any other security module enabled? ------------------------------------------------------------------------ [2017-05-09 13:58:27] jeremys at ha dot com Description: ------------ Executing curl_exec() with a host/URL that refuses the connection makes curl_exec() sometimes raise an E_WARNING because curl_exec() calls curl_error() internally. The error is as follows: curl_error() expects parameter 1 to be resource, boolean given As you can see in the sample script, there is no explicit call to curl_error(), yet the above error is seen. I've only been able to reproduce via Apache, not via cli. Apache/2.4.6 (Red Hat Enterprise Linux) PHP 7.1.3 (part of Zend Server 9.1) - I assume 7.1.4 as well since there are no relevant changes to the curl interface in the PHP source code libcurl 7.29.0 Test script: --------------- <?php ini_set( 'display_errors', 1 ); ini_set( 'error_reporting', E_ALL ); set_error_handler( function ( ...$error ) { array_pop( $error ); print_r( $error ); die(); }); $resource = curl_init(); curl_setopt( $resource, CURLOPT_URL, 'http://127.0.0.1:1' ); curl_setopt( $resource, CURLOPT_RETURNTRANSFER, 1 ); curl_exec( $resource ); echo 'Script finished.'; Expected result: ---------------- Script finished. Actual result: -------------- Array ( [0] => 2 [1] => curl_error() expects parameter 1 to be resource, boolean given [2] => /usr/local/apache/htdocs2/curl-error-test.php [3] => 16 ) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74563&edit=1