WordPress/Sniffs/Security/ValidatedSanitizedInputSniff.php
protected function mergeFunctionLists() {
		if ( $this->customSanitizingFunctions !== $this->addedCustomFunctions['sanitize'] ) {
			$this->sanitizingFunctions = $this->merge_custom_array(
				$this->customSanitizingFunctions,
				$this->sanitizingFunctions
			);

			$this->addedCustomFunctions['sanitize'] = $this->customSanitizingFunctions;
		}

		if ( $this->customUnslashingSanitizingFunctions !== $this->addedCustomFunctions['unslashsanitize'] ) {
			$this->unslashingSanitizingFunctions = $this->merge_custom_array(
				$this->customUnslashingSanitizingFunctions,
				$this->unslashingSanitizingFunctions
			);

			$this->addedCustomFunctions['unslashsanitize'] = $this->customUnslashingSanitizingFunctions;
		}
	}
protected function mergeFunctionLists() {
		if ( $this->customSanitizingFunctions !== $this->addedCustomFunctions['sanitize'] ) {
			$this->sanitizingFunctions = $this->merge_custom_array(
				$this->customSanitizingFunctions,
				$this->sanitizingFunctions
			);

			$this->addedCustomFunctions['sanitize'] = $this->customSanitizingFunctions;
		}

		if ( $this->customUnslashingSanitizingFunctions !== $this->addedCustomFunctions['unslashsanitize'] ) {
			$this->unslashingSanitizingFunctions = $this->merge_custom_array(
				$this->customUnslashingSanitizingFunctions,
				$this->unslashingSanitizingFunctions
			);

			$this->addedCustomFunctions['unslashsanitize'] = $this->customUnslashingSanitizingFunctions;
		}
	}
Merge custom functions provided via a custom ruleset with the defaults, if we haven't already.

@since 0.11.0 Split out from the `process()` method.

@return void