name : Util_Content.php <?php namespace W3TC; class Util_Content { /** * Check if content is HTML * * @param string $content * @return boolean */ static public function is_html( $content ) { $content = Util_Content::_is_html_prepare( $content ); return stripos( $content, '<html' ) === 0 || stripos( $content, '<!DOCTYPE' ) === 0; } /** * Check if content is HTML or XML * * @param string $content * @return boolean */ static public function is_html_xml( $content ) { $content = Util_Content::_is_html_prepare( $content ); return stripos( $content, '<?xml' ) === 0 || stripos( $content, '<html' ) === 0 || stripos( $content, '<!DOCTYPE' ) === 0; } static private function _is_html_prepare( $content ) { if ( strlen( $content ) > 1000 ) { $content = substr( $content, 0, 1000 ); } if ( strstr( $content, '<!--' ) !== false ) { $content = preg_replace( '~<!--.*?-->~s', '', $content ); } $content = ltrim( $content, "\x00\x09\x0A\x0D\x20\xBB\xBF\xEF" ); return $content; } /** * If content can handle HTML comments, can disable printout per request using filter 'w3tc_can_print_comment' * * @param unknown $buffer * @return bool */ static public function can_print_comment( $buffer ) { if ( function_exists( 'apply_filters' ) ) return apply_filters( 'w3tc_can_print_comment', Util_Content::is_html_xml( $buffer ) && !defined( 'DOING_AJAX' ) ); return Util_Content::is_html_xml( $buffer ) && !defined( 'DOING_AJAX' ); } /** * Returns GMT date * * @param integer $time * @return string */ static public function http_date( $time ) { return gmdate( 'D, d M Y H:i:s \G\M\T', $time ); } /** * Escapes HTML comment * * @param string $comment * @return mixed */ static public function escape_comment( $comment ) { while ( strstr( $comment, '--' ) !== false ) { $comment = str_replace( '--', '- -', $comment ); } return $comment; } /** * Deprecated. Added to prevent loading-order errors during upgrades * from older w3tc plugin versions **/ static public function is_database_error() { return false; } /** * Converts * 127.0.0.1:1234 to ( '123.0.0.1', 1234 ) * tls://127.0.0.1:1234 to ( 'tls://123.0.0.1', 1234 ) * unix:/my/pipe to ( 'unix:/my/pipe', 0 ) * * Doesnt fit to that class perfectly but selected due to common usage * of loaded classes */ static public function endpoint_to_host_port( $server, $port_default = 0 ) { $p = strrpos( $server, ':' ); if ( substr( $server, 0, 5 ) == 'unix:' || $p === false ) { return array( trim( $server ), $port_default ); } return array( trim( substr( $server, 0, $p ) ), (int)substr( $server, $p + 1 ) ); } }