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In PHP development, we often need to convert arrays into request parameters for data transmission. Converting PHP arrays into request parameters is a very common operation and an inevitable operation in PHP development. This article will introduce how to use functions in PHP to convert arrays into request parameters.
1. Use the http_build_query function
PHP has a built-in http_build_query function, which can be used to convert arrays into request parameters. The http_build_query function is used to convert an array into a query string after URL-encoding. Its basic syntax is as follows:
string http_build_query ( mixed $query_data [, string $numeric_prefix [, string $arg_separator [, int $enc_type = PHP_QUERY_RFC1738 ]]] )
Among them, query_data represents the array to be converted, and numeric_prefix is optional, which means that the array is forced to be converted into The key name of a pure numeric index, arg_separator represents the separator between array elements, enc_type represents which character set is used for URL encoding, and the default is PHP_QUERY_RFC1738.
For example, we have the following array:
$data = array( 'name' => 'Tom', 'age' => 20, 'gender' => 'male' );
We can use the http_build_query function to convert it into request parameters in the following format:
name=Tom&age=20&gender=male
The specific usage is as follows:
$data = array( 'name' => 'Tom', 'age' => 20, 'gender' => 'male' ); $params = http_build_query($data); echo $params;
2. Handwritten array to request parameter function
If we don’t want to use PHP’s built-in function, we can also handwrite a function to convert the array into request parameter. The following is a simple sample code:
function array2param($data) { $params = array(); foreach ($data as $key => $value) { if (is_array($value)) { $params[] = array2param($value); } else { $params[] = urlencode($key) . '=' . urlencode($value); } } return implode('&', $params); }
We can call this function to convert the array into request parameters. The sample code is as follows:
$data = array( 'name' => 'Tom', 'age' => 20, 'gender' => 'male' ); $params = array2param($data); echo $params;
The output result is as follows:
name=Tom&age=20&gender=male
3. Use http_build_query and array recursive traversal
Using http_build_query and array recursive traversal can be more convenient when processing multi-dimensional arrays. The following is the sample code:
function array2param($data) { $queryData = array(); // 将生成的字符串数组 foreach ($data as $key => $value) { if (is_array($value)) { $queryData[] = http_build_query(array($key => $value)); // 处理多维数组 } else { $queryData[] = urlencode($key) . '=' . urlencode($value); } } return implode('&', $queryData); }
Usage example:
$data = array( 'name' => 'Tom', 'age' => 20, 'gender' => 'male', 'contact' => array( 'email' => 'example@mail.com', 'phone' => '1234567890' ) ); $params = array2param($data); echo $params;
Output result:
name=Tom&age=20&gender=male&contact%5Bemail%5D=example%40mail.com&contact%5Bphone%5D=1234567890
Summary
In PHP, converting an array into a request parameter is A very common operation. This article introduces three different implementation methods, namely using http_build_query function, handwritten array to request parameter function and using http_build_query and array recursive traversal. Depending on the needs and actual situation, different methods can be chosen to handle it.
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