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    Object Storage Service:OSS PHP SDK reported "Use of undefined constant CURLOPT_CLOSEPOLICY - assumed" error

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    Object Storage Service:OSS PHP SDK reported "Use of undefined constant CURLOPT_CLOSEPOLICY - assumed" error

    Last Updated:Jun 10, 2026

    Resolve the CURLOPT_CLOSEPOLICY undefined constant warning in the OSS PHP SDK, caused either by PHP 5.6.0 removing the constant or by a missing curl installation.

    Problem description

    When using the OSS PHP SDK, the following error appears:

    Use of undefined constant CURLOPT_CLOSEPOLICY - assumed 
'CURLOPT_CLOSEPOLICY' in 
D:\phptools\www\pia\oss_php_sdk_20140625\lib\requestcore\requestcore.class.php on line 610:

    This error has two distinct causes. Run the following commands to identify which one applies to your environment before proceeding:

    # Check your PHP version
php -v

# Check whether curl is loaded
php -m | grep curl

    • If your PHP version is 5.6.0 or later and curl appears in the output, see Cause 1: PHP 5.6.0 removed CURLOPT_CLOSEPOLICY.

    • If curl does not appear in the output, see Cause 2: curl is not installed or not configured.

    Cause 1: PHP 5.6.0 removed CURLOPT_CLOSEPOLICY

    PHP 5.6.0 removed the CURLOPT_CLOSEPOLICY constant. The OSS PHP SDK still references this constant in requestcore.class.php, triggering the warning at runtime.

    Fix

    Because the official SDK has not been updated, remove the CURLOPT_CLOSEPOLICY reference from the SDK source file:

    1. Open the following file in your SDK installation:

       lib/requestcore/requestcore.class.php

    1. Search for CURLOPT_CLOSEPOLICY and delete or comment out the line where this constant is used.

    2. Save the file and re-run your code to confirm the warning is gone.

      Note

      This is a workaround for a known compatibility gap in the SDK. Once the SDK is officially updated to remove this reference, revert this manual edit.

    Cause 2: curl is not installed or not configured

    The OSS PHP SDK requires the curl extension. If curl is missing or its path is not configured correctly, PHP cannot call curl functions, which triggers this error.

    Fix

    Install the curl extension or specify the curl environment variable, then restart your web server.

    After installation, verify that the curl extension is loaded:

    php -m | grep curl

    If curl appears in the output, the extension is active.

    Applicable scope

    • Object Storage Service (OSS)