Online PHP editor | output for Dpob1

<?php $examples = [ ['https://stackoverflow.com/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', false], ['http://stackoverflow.com/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', false], ['//stackoverflow.com/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', false], ['/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', true], ['/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', true], ['/stackoverflow.com/questions/20248666/in-this-case-which-is-better-in-matching-regular-expression-or-parse-url', true], ]; function is_relative_parse_url($url) { return parse_url($url, PHP_URL_SCHEME) === null && strncmp($url, '//', 2) !== 0; } function is_relative_preg_match_ci($url) { return preg_match('/^(http|https)?:?\/\//i', $url) === 0; } function is_relative_preg_match($url) { return preg_match('/^(http|https)?:?\/\//', $url) === 0; } function is_relative_strpos($url) { return !(strpos($url, 'https://') === 0 || strpos($url, 'http://') === 0 || strpos($url, '//') === 0); } function is_relative_str_starts_with_fallback($url) { if(PHP_MAJOR_VERSION <= 8) { return is_relative_strpos($url); } return !(str_starts_with($url, 'https://') || str_starts_with($url, 'http://') || str_starts_with($url, '//')); } function is_relative_strncmp($url) { return !(strncmp($url, 'https://', 8) || strncmp($url, 'http://', 7) || strncmp($url, '//', 2)); } function is_relative_substr_compare($url) { return !( substr_compare($url, 'https://', 0, 8) === 0 || substr_compare($url, 'http://', 0, 7) === 0 || substr_compare($url, '//', 0, 2) === 0 ); } function is_relative_substr_compare_cs($url) { return !( substr_compare($url, 'https://', 0, 8, true) === 0 || substr_compare($url, 'http://', 0, 7, true) === 0 || substr_compare($url, '//', 0, 2) === 0 ); } function test($name, $test, $examples, $reps = 200000) { $time = microtime(true); for($i = 0; $i < $reps; $i++) { foreach($examples as [$url, $expected]) { if ($test($url) !== $expected) { throw new Exception("Failed test $name with URL $url, expected " . ($expected ? "true": "false")); } } } echo "$name: ", number_format(microtime(true) - $time, 3), "\n"; } test('preg_match', function($url) { return is_relative_preg_match($url); }, $examples); test('preg_match (case insensitive)', function($url) { return is_relative_preg_match_ci($url); }, $examples); test('strpos', function($url) { return is_relative_strpos($url); }, $examples); test('str_starts_with', function($url) { return is_relative_str_starts_with_fallback($url); }, $examples); test('substr_compare (case insensitive)', function($url) { return is_relative_substr_compare($url); }, $examples); test('substr_compare (case sensitive)', function($url) { return is_relative_substr_compare_cs($url); }, $examples); test('parse_url', function($url) { return is_relative_parse_url($url); }, $examples);