http_build_query() And Enumerations

<?php

enum e : string {
    case A = 'a';
}

print http_build_query(['a' => 'A', 'b' => e::A]);

// PHP 8.4 and more recent : a=A&b=a

// Pre PHP 8.4 : a=A&b%5Bname%5D=A&b%5Bvalue%5D=a  a=A&b[name]=A&b[value]='a'

When using a backed enum with http_build_query(), the PHP native function uses the value of the case, and not the case itself. This is very convenient to output a compatible value, instead of an internal object. This is valid since PHP 8.4.

See Also

• http_build_query and enum [Try me]

PHP Features

• enum

• http_build_query

Last updated: 14 July 2026