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<?php
/**
* Is the URL on the current WordPress web site?
*
* Checks if URL begins with Site Home URL.
* Strip http[s]://[www.] and leading and trailing blanks and convert to lower-case before comparing,
* to allow http, etc. to be omitted on entry
*
* @param string $url URL to be checked to be sure it is "on" the current WordPress web site
* @return bool bool TRUE if URL is on current WordPress web site; FALSE otherwise
*/
function jr_ps_site_url( $url ) {
$site_home = jr_ps_urlcompare_prep( get_home_url() );
return ( substr( jr_ps_urlcompare_prep( $url ), 0, strlen( $site_home ) ) === $site_home );
}
/**
* Prepare a URL for comparison with another URL
*
* Strip [http[s]://][www.] and leading and trailing blanks, and convert to lower-case,
* to:
* (1) permit comparison of "synonym" URLs; and
* (2) allow http to be omitted when inputting a URL
*
* @param string $url URL to be prepped for comparison
* @return string URL prepped for comparison
*/
function jr_ps_urlcompare_prep( $url ) {
$prep_url = strtolower( trim( $url ) );
if ( 'http' === substr( $prep_url, 0, 4 ) ) {
if ( 's' === substr( $prep_url, 4, 1 ) ) {
$cursor = 5; // Next character to look at in URL
} else {
$cursor = 4;
}
if ( '://' === substr( $prep_url, $cursor, 3 ) ) {
$cursor = $cursor + 3;
}
} else {
$cursor = 0;
}
if ( 'www.' === substr( $prep_url, $cursor, 4 ) ) {
$cursor = $cursor + 4;
}
return substr( $prep_url, $cursor );
}
?>