


How to Solve the \'Array to String Conversion\' Error When Sending Multidimensional Arrays in CURL with PHP?
Oct 23, 2024 am 08:17 AMSending Multidimensional Arrays via CURL and PHP
When posting form data containing multidimensional arrays using CURL, encountering an "Array to string conversion" error is a common problem. This occurs when attempting to set CURLOPT_POSTFIELDS with an array that includes arrays.
Since the Content-Type header must be multipart/form-data to facilitate file transfer, converting the array to a query string or using http_build_query() is not feasible. Additionally, accessing the receiving host's code to serialize and unserialize the array is not an option.
To resolve this issue, a custom function named http_build_query_for_curl can be employed. It recursively iterates through the array, converting it into a format suitable for CURL POST requests. The modified array can then be assigned to $post and passed to curl_setopt(), avoiding the error.
Here's the code for the http_build_query_for_curl function and an example of its usage:
<code class="php">function http_build_query_for_curl( $arrays, &$new = array(), $prefix = null ) { if ( is_object( $arrays ) ) { $arrays = get_object_vars( $arrays ); } foreach ( $arrays AS $key => $value ) { $k = isset( $prefix ) ? $prefix . '[' . $key . ']' : $key; if ( is_array( $value ) OR is_object( $value ) ) { http_build_query_for_curl( $value, $new, $k ); } else { $new[$k] = $value; } } } $arrays = array( 'name' => array( 'first' => array( 'Natali', 'Yura' ) ) ); http_build_query_for_curl( $arrays, $post ); print_r($post);</code>
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