A script to scan over prefix.cc and determine the most popular patterns for rdf namespace IRIs

ns.php

<?php
$ns = json_decode( file_get_contents( "http://prefix.cc/popular/all.file.json" ) );
foreach ( $ns as $k => $v ) {
	if ( is_null( $v ) ) { 
		unset( $ns->{$k} );
	}
}

$types = array( '/ns/', '/ns#', '/rdf/', '/rdf#', '/ns/', '/ns#', '/schema/', '/schema#', '/ontologies/', '/ontologies#', '/vocab/', '/vocab#', '/namespaces/', '/namespaces#', '/ontology/', '/ontology#', '/xml/', '/xml#', '/owl/', '/owl#', '/schema/', '/schema#', '/spec/', '/spec#', '/terms/', '/terms#', '/schemas/', '/schemas#' );
$types = array_combine( $types, array_fill( 0, count( $types ), 0 ) );
foreach ( $ns as $p => $uri ) {
	foreach( $types as $str => &$n ) {
		if ( strpos( $uri, $str ) !== false ) {
			$n++;
		}
	}
}

arsort( $types, SORT_NUMERIC );

echo "Pattern usage:\n";
foreach ( $types as $str => &$n ) {
	echo "$n\t$str\n";
}

echo "\n";
$combined = array();
foreach ( $types as $str => &$n ) {
	$short = preg_replace( '![#/]$!', '', $str );
	if ( !array_key_exists( $short, $combined ) ) {
		$combined[$short] = 0;
	}
	$combined[$short] += $n;
}

arsort( $combined, SORT_NUMERIC );

echo "Combined:\n";
foreach ( $combined as $str => &$n ) {
	echo "$n\t$str\n";
}