Automattic\WooCommerce\Internal\EmailEditor\WCTransactionalEmails

WCEmailTemplateDivergenceDetector::is_sha1_hash │ private static │ WC 1.0

Validate that a string is shaped like a SHA-1 hex digest.

_wc_email_template_source_hash is produced by sha1() (40 hex chars), but as persisted post meta it is theoretically reachable from DB migrations, direct update_post_meta or misbehaving extensions. Any non-SHA-1 value would otherwise be compared byte-for-byte against real hashes and always report core_updated_customized, so we short-circuit instead.

Method of the class: WCEmailTemplateDivergenceDetector{}

No Hooks.

Returns

true|false. True when the value is a 40-character hex string.

Usage

$result = WCEmailTemplateDivergenceDetector::is_sha1_hash( $hash ): bool;
$hash(string) (required)
Candidate hash value.

WCEmailTemplateDivergenceDetector::is_sha1_hash() code WC 10.8.1

woocommerce/src/Internal/EmailEditor/WCTransactionalEmails/WCEmailTemplateDivergenceDetector.php 
private static function is_sha1_hash( string $hash ): bool {
	return 40 === strlen( $hash ) && ctype_xdigit( $hash );
}