Detailed explanation of how to troubleshoot php curl errors

php curl common errors: SSL error, bool(false)

Symptom: php curl calls https error

Troubleshooting method: Try using curl call in the command line.

Cause: The computer room where the server is located cannot verify the SSL certificate.

Solution: Skip SSL certificate check.

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

Symptoms: php curl calls curl_exec to return bool (false), and the command line curl call is normal.

Troubleshooting method:

var_dump(curl_error($ch));

Check the return value of initialization and execution of cURL function. curl_error() and curl_errno() will return further information in case of failure:

try {
    $ch = curl_init();

    if (FALSE === $ch)
        throw new Exception('failed to initialize');

    curl_setopt($ch, CURLOPT_URL, 'http://example.com/');
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt(/* ... */);

    $content = curl_exec($ch);

    if (FALSE === $content)
        throw new Exception(curl_error($ch), curl_errno($ch));

    // ...process $content now} catch(Exception $e) {

    trigger_error(sprintf(
        'Curl failed with error #%d: %s',
        $e->getCode(), $e->getMessage()),
        E_USER_ERROR);}

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