http_build_query.md

http_build_query

— Generates a URL-encoded query string from the associative (or indexed) array provided.

http_build_query(
    array|object $data,
    string $numeric_prefix = "",
    ?string $arg_separator = null,
    int $encoding_type = PHP_QUERY_RFC1738
): string

data

- May be an array or object containing properties.
- If data is an array, it may be a simple one-dimensional structure, or an array of arrays (which in turn may contain other arrays).
- If data is an object, then only public properties will be incorporated into the result.

numeric_prefix

- If numeric indices are used in the base array and this parameter is provided, it will be prepended to the numeric index for elements in the base array only.

arg_separator

- arg_separator.output is used to separate arguments but may be overridden by specifying this parameter.

encoding_type

- By default, PHP_QUERY_RFC1738.
- If encoding_type is PHP_QUERY_RFC1738, then encoding is performed per » RFC 1738 and the application/x-www-form-urlencoded media type, which implies that spaces are encoded as plus (+) signs.
- If encoding_type is PHP_QUERY_RFC3986, then encoding is performed according to » RFC 3986, and spaces will be percent encoded (%20).

$parametersList = [
    'foo' => 'bar',
    'baz' => 'boom',
    'cow' => 'milk',
    'null' => null,
    'php' => 'hypertext processor'
];

echo http_build_query($data) . "\n";
echo http_build_query($data, '', '&');

The above example will output:

foo=bar&baz=boom&cow=milk&php=hypertext+processor
foo=bar&baz=boom&cow=milk&php=hypertext+processor