wp-includes/rest-api/class-wp-rest-request.php:733Parses the request body parameters.
protected function parse_body_params() { if ( $this->parsed_body ) { return; } $this->parsed_body = true; /* * Check that we got URL-encoded. Treat a missing Content-Type as * URL-encoded for maximum compatibility. */ $content_type = $this->get_content_type(); if ( ! empty( $content_type ) && 'application/x-www-form-urlencoded' !== $content_type['value'] ) { return; } parse_str( $this->get_body(), $params ); /* * Add to the POST parameters stored internally. If a user has already * set these manually (via `set_body_params`), don't override them. */ $this->params['POST'] = array_merge( $params, $this->params['POST'] ); }Introduced in 4.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/rest-api/class-wp-rest-request.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.