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How to debug curl error information in php: 1. Use the functions [curl_errno] and [curl_error] to return the HTTP error code and error category respectively; 2. Set [CURLOPT_VERBOSE] to true and set it to A file opened with fopen.
How to debug curl error messages in php:
The first method, First What can be used is the curl_errno
and curl_error
functions, which return the HTTP error code and error category respectively. For example:
<?php $ch = curl_init('http://example.com/'); curl_exec($ch); if (curl_errno($ch)) { echo 'Curl error: ' . curl_error($ch); } curl_close($ch); ?>
Secondly, if you need to get more detailed information, you can use the curl_getinfo
function. For example:
<?php $ch = curl_init('http://example.com/'); curl_setopt($ch, CURLINFO_HEADER_OUT, true); curl_exec($ch); if (!curl_errno($ch)) { print_r(curl_getinfo($ch)); } curl_close($ch); ?>
After setting the CURLINFO_HEADER_OUT
option, the array returned by the curl_getinfo function will contain the header information of the cURL request. To see the response header information, you can set the
CURLOPT_HEADER option to true in curl_setopt.
curl_exec When the function is executed successfully, the response body information will be processed according to the value of the
CURLOPT_RETURNTRANSFER option: if it is true, it will be returned as a string, if it is false, it will be directly output. The result is FALSE if execution fails. That is to say, if the execution fails (assuming it is a 400 error), the response text (which may contain more specific error information) cannot be seen from the result of the curl_exec function. There are two ways to see the response text. The first method is to set 400 as the success code. The example is as follows:
curl_setopt($ch, CURLOPT_FAILONERROR, false); curl_setopt($ch, CURLOPT_HTTP200ALIASES, array(400));
The second method is to set CURLOPT_VERBOSE to true and CURLOPT_STDERR
is set to a file opened with fopen. In this way cURL will record all interaction information with the server into this file.
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