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/**
* @package WPSEO
* @subpackage Internals
* @since 1.8.0
*/
/**
* Group of utility methods for use by WPSEO
* All methods are static, this is just a sort of namespacing class wrapper.
*/
class WPSEO_Utils {
/**
* @var bool $has_filters Whether the PHP filter extension is enabled
* @static
*/
public static $has_filters;
/**
* Check whether the current user is allowed to access the configuration.
*
* @static
*
* @return boolean
*/
public static function grant_access() {
if ( ! is_multisite() ) {
return true;
}
$options = get_site_option( 'wpseo_ms' );
if ( $options['access'] === 'admin' && current_user_can( 'manage_options' ) ) {
return true;
}
if ( $options['access'] === 'superadmin' && ! is_super_admin() ) {
return false;
}
return true;
}
/**
* Check whether file editing is allowed for the .htaccess and robots.txt files
*
* @internal current_user_can() checks internally whether a user is on wp-ms and adjusts accordingly.
*
* @static
*
* @return bool
*/
public static function allow_system_file_edit() {
$allowed = true;
if ( current_user_can( 'edit_files' ) === false ) {
$allowed = false;
}
/**
* Filter: 'wpseo_allow_system_file_edit' - Allow developers to change whether the editing of
* .htaccess and robots.txt is allowed
*
* @api bool $allowed Whether file editing is allowed
*/
return apply_filters( 'wpseo_allow_system_file_edit', $allowed );
}
/**
* Check if the web server is running on Apache
*
* @static
*
* @return bool
*/
public static function is_apache() {
if ( isset( $_SERVER['SERVER_SOFTWARE'] ) && stristr( $_SERVER['SERVER_SOFTWARE'], 'apache' ) !== false ) {
return true;
}
return false;
}
/**
* Check if the web server is running on Nginx
*
* @static
*
* @return bool
*/
public static function is_nginx() {
if ( isset( $_SERVER['SERVER_SOFTWARE'] ) && stristr( $_SERVER['SERVER_SOFTWARE'], 'nginx' ) !== false ) {
return true;
}
return false;
}
/**
* Check whether a url is relative
*
* @static
*
* @param string $url
*
* @return bool
*/
public static function is_url_relative( $url ) {
return ( strpos( $url, 'http' ) !== 0 && strpos( $url, '//' ) !== 0 );
}
/**
* List all the available user roles
*
* @static
*
* @return array $roles
*/
public static function get_roles() {
global $wp_roles;
if ( ! isset( $wp_roles ) ) {
$wp_roles = new WP_Roles();
}
$roles = $wp_roles->get_names();
return $roles;
}
/**
* Standardize whitespace in a string
*
* Replace line breaks, carriage returns, tabs with a space, then remove double spaces.
*
* @static
*
* @param string $string
*
* @return string
*/
public static function standardize_whitespace( $string ) {
return trim( str_replace( ' ', ' ', str_replace( array( "\t", "\n", "\r", "\f" ), ' ', $string ) ) );
}
/**
* Strip out the shortcodes with a filthy regex, because people don't properly register their shortcodes.
*
* @static
*
* @param string $text Input string that might contain shortcodes
*
* @return string $text string without shortcodes
*/
public static function strip_shortcode( $text ) {
return preg_replace( '`\[[^\]]+\]`s', '', $text );
}
/**
* Recursively trim whitespace round a string value or of string values within an array
* Only trims strings to avoid typecasting a variable (to string)
*
* @static
*
* @param mixed $value Value to trim or array of values to trim
*
* @return mixed Trimmed value or array of trimmed values
*/
public static function trim_recursive( $value ) {
if ( is_string( $value ) ) {
$value = trim( $value );
}
elseif ( is_array( $value ) ) {
$value = array_map( array( __CLASS__, 'trim_recursive' ), $value );
}
return $value;
}
/**
* Translates a decimal analysis score into a textual one.
*
* @static
*
* @param int $val The decimal score to translate.
* @param bool $css_value Whether to return the i18n translated score or the CSS class value.
*
* @return string
*/
public static function translate_score( $val, $css_value = true ) {
if ( $val > 10 ) {
$val = round( $val / 10 );
}
switch ( $val ) {
case 0:
$score = __( 'N/A', 'wordpress-seo' );
$css = 'na';
break;
case 4:
case 5:
$score = __( 'Poor', 'wordpress-seo' );
$css = 'poor';
break;
case 6:
case 7:
$score = __( 'OK', 'wordpress-seo' );
$css = 'ok';
break;
case 8:
case 9:
case 10:
$score = __( 'Good', 'wordpress-seo' );
$css = 'good';
break;
default:
$score = __( 'Bad', 'wordpress-seo' );
$css = 'bad';
break;
}
if ( $css_value ) {
return $css;
}
else {
return $score;
}
}
/**
* Emulate the WP native sanitize_text_field function in a %%variable%% safe way
* @see https://core.trac.wordpress.org/browser/trunk/src/wp-includes/formatting.php for the original
*
* Sanitize a string from user input or from the db
*
* check for invalid UTF-8,
* Convert single < characters to entity,
* strip all tags,
* remove line breaks, tabs and extra white space,
* strip octets - BUT DO NOT REMOVE (part of) VARIABLES WHICH WILL BE REPLACED.
*
* @static
*
* @param string $value
*
* @return string
*/
public static function sanitize_text_field( $value ) {
$filtered = wp_check_invalid_utf8( $value );
if ( strpos( $filtered, '<' ) !== false ) {
$filtered = wp_pre_kses_less_than( $filtered );
// This will strip extra whitespace for us.
$filtered = wp_strip_all_tags( $filtered, true );
}
else {
$filtered = trim( preg_replace( '`[\r\n\t ]+`', ' ', $filtered ) );
}
$found = false;
while ( preg_match( '`[^%](%[a-f0-9]{2})`i', $filtered, $match ) ) {
$filtered = str_replace( $match[1], '', $filtered );
$found = true;
}
unset( $match );
if ( $found ) {
// Strip out the whitespace that may now exist after removing the octets.
$filtered = trim( preg_replace( '` +`', ' ', $filtered ) );
}
/**
* Filter a sanitized text field string.
*
* @since WP 2.9.0
*
* @param string $filtered The sanitized string.
* @param string $str The string prior to being sanitized.
*/
return apply_filters( 'sanitize_text_field', $filtered, $value );
}
/**
* Sanitize a url for saving to the database
* Not to be confused with the old native WP function
*
* @todo [JRF => whomever] check/improve url verification
*
* @static
*
* @param string $value
* @param array $allowed_protocols
*
* @return string
*/
public static function sanitize_url( $value, $allowed_protocols = array( 'http', 'https' ) ) {
return esc_url_raw( sanitize_text_field( rawurldecode( $value ) ), $allowed_protocols );
}
/**
* Validate a value as boolean
*
* @static
*
* @param mixed $value
*
* @return bool
*/
public static function validate_bool( $value ) {
if ( ! isset( self::$has_filters ) ) {
self::$has_filters = extension_loaded( 'filter' );
}
if ( self::$has_filters ) {
return filter_var( $value, FILTER_VALIDATE_BOOLEAN );
}
else {
return self::emulate_filter_bool( $value );
}
}
/**
* Cast a value to bool
*
* @static
*
* @param mixed $value Value to cast
*
* @return bool
*/
public static function emulate_filter_bool( $value ) {
$true = array(
'1',
'true',
'True',
'TRUE',
'y',
'Y',
'yes',
'Yes',
'YES',
'on',
'On',
'On',
);
$false = array(
'0',
'false',
'False',
'FALSE',
'n',
'N',
'no',
'No',
'NO',
'off',
'Off',
'OFF',
);
if ( is_bool( $value ) ) {
return $value;
}
else if ( is_int( $value ) && ( $value === 0 || $value === 1 ) ) {
return (bool) $value;
}
else if ( ( is_float( $value ) && ! is_nan( $value ) ) && ( $value === (float) 0 || $value === (float) 1 ) ) {
return (bool) $value;
}
else if ( is_string( $value ) ) {
$value = trim( $value );
if ( in_array( $value, $true, true ) ) {
return true;
}
else if ( in_array( $value, $false, true ) ) {
return false;
}
else {
return false;
}
}
return false;
}
/**
* Validate a value as integer
*
* @static
*
* @param mixed $value
*
* @return int|bool int or false in case of failure to convert to int
*/
public static function validate_int( $value ) {
if ( ! isset( self::$has_filters ) ) {
self::$has_filters = extension_loaded( 'filter' );
}
if ( self::$has_filters ) {
return filter_var( $value, FILTER_VALIDATE_INT );
}
else {
return self::emulate_filter_int( $value );
}
}
/**
* Cast a value to integer
*
* @static
*
* @param mixed $value Value to cast
*
* @return int|bool
*/
public static function emulate_filter_int( $value ) {
if ( is_int( $value ) ) {
return $value;
}
else if ( is_float( $value ) ) {
if ( (int) $value == $value && ! is_nan( $value ) ) {
return (int) $value;
}
else {
return false;
}
}
else if ( is_string( $value ) ) {
$value = trim( $value );
if ( $value === '' ) {
return false;
}
else if ( ctype_digit( $value ) ) {
return (int) $value;
}
else if ( strpos( $value, '-' ) === 0 && ctype_digit( substr( $value, 1 ) ) ) {
return (int) $value;
}
else {
return false;
}
}
return false;
}
/**
* (Un-)schedule the yoast tracking cronjob if the tracking option has changed
*
* @todo - [JRF => Yoast] check if this has any impact on other Yoast plugins which may
* use the same tracking schedule hook. If so, maybe get any other yoast plugin options,
* check for the tracking status and unschedule based on the combined status.
*
* @static
*
* @param mixed $disregard Not needed - passed by add/update_option action call
* Option name if option was added, old value if option was updated
* @param array $value The (new/current) value of the wpseo option
* @param bool $force_unschedule Whether to force an unschedule (i.e. on deactivate)
*
* @return void
*/
public static function schedule_yoast_tracking( $disregard, $value, $force_unschedule = false ) {
$current_schedule = wp_next_scheduled( 'yoast_tracking' );
if ( $force_unschedule !== true && ( $value['yoast_tracking'] === true && $current_schedule === false ) ) {
// The tracking checks daily, but only sends new data every 7 days.
wp_schedule_event( time(), 'daily', 'yoast_tracking' );
}
elseif ( $force_unschedule === true || ( $value['yoast_tracking'] === false && $current_schedule !== false ) ) {
wp_clear_scheduled_hook( 'yoast_tracking' );
}
}
/**
* Clears the WP or W3TC cache depending on which is used
*
* @static
*/
public static function clear_cache() {
if ( function_exists( 'w3tc_pgcache_flush' ) ) {
w3tc_pgcache_flush();
}
elseif ( function_exists( 'wp_cache_clear_cache' ) ) {
wp_cache_clear_cache();
}
}
/**
* Flush W3TC cache after succesfull update/add of taxonomy meta option
*
* @todo [JRF => whomever] check the above and this function to see if they should be combined or really
* do something significantly different
*
* @static
*/
public static function flush_w3tc_cache() {
if ( defined( 'W3TC_DIR' ) && function_exists( 'w3tc_objectcache_flush' ) ) {
w3tc_objectcache_flush();
}
}
/**
* Clear rewrite rules
*
* @static
*/
public static function clear_rewrites() {
delete_option( 'rewrite_rules' );
}
/**
* Clear entire XML sitemap cache
*
* @param array $types
*/
public static function clear_sitemap_cache( $types = array() ) {
global $wpdb;
if ( wp_using_ext_object_cache() ) {
return;
}
if ( ! apply_filters( 'wpseo_enable_xml_sitemap_transient_caching', true ) ) {
return;
}
// not sure about efficiency, but that's what code elsewhere does R.
$options = WPSEO_Options::get_all();
if ( true !== $options['enablexmlsitemap'] ) {
return;
}
$query = "DELETE FROM $wpdb->options WHERE";
if ( ! empty( $types ) ) {
$first = true;
foreach ( $types as $sitemap_type ) {
if ( ! $first ) {
$query .= ' OR ';
}
$query .= " option_name LIKE '_transient_timeout_wpseo_sitemap_cache_" . $sitemap_type . "_%'";
$first = false;
}
}
else {
$query .= " option_name LIKE '_transient_timeout_wpseo_sitemap_%'";
}
$wpdb->query( $query );
}
/**
* Do simple reliable math calculations without the risk of wrong results
* @see http://floating-point-gui.de/
* @see the big red warning on http://php.net/language.types.float.php
*
* In the rare case that the bcmath extension would not be loaded, it will return the normal calculation results
*
* @static
*
* @since 1.5.0
*
* @param mixed $number1 Scalar (string/int/float/bool)
* @param string $action Calculation action to execute. Valid input:
* '+' or 'add' or 'addition',
* '-' or 'sub' or 'subtract',
* '*' or 'mul' or 'multiply',
* '/' or 'div' or 'divide',
* '%' or 'mod' or 'modulus'
* '=' or 'comp' or 'compare'
* @param mixed $number2 Scalar (string/int/float/bool)
* @param bool $round Whether or not to round the result. Defaults to false.
* Will be disregarded for a compare operation
* @param int $decimals Decimals for rounding operation. Defaults to 0.
* @param int $precision Calculation precision. Defaults to 10.
*
* @return mixed Calculation Result or false if either or the numbers isn't scalar or
* an invalid operation was passed
* - for compare the result will always be an integer
* - for all other operations, the result will either be an integer (preferred)
* or a float
*/
public static function calc( $number1, $action, $number2, $round = false, $decimals = 0, $precision = 10 ) {
static $bc;
if ( ! is_scalar( $number1 ) || ! is_scalar( $number2 ) ) {
return false;
}
if ( ! isset( $bc ) ) {
$bc = extension_loaded( 'bcmath' );
}
if ( $bc ) {
$number1 = number_format( $number1, 10, '.', '' );
$number2 = number_format( $number2, 10, '.', '' );
}
$result = null;
$compare = false;
switch ( $action ) {
case '+':
case 'add':
case 'addition':
$result = ( $bc ) ? bcadd( $number1, $number2, $precision ) /* string */ : ( $number1 + $number2 );
break;
case '-':
case 'sub':
case 'subtract':
$result = ( $bc ) ? bcsub( $number1, $number2, $precision ) /* string */ : ( $number1 - $number2 );
break;
case '*':
case 'mul':
case 'multiply':
$result = ( $bc ) ? bcmul( $number1, $number2, $precision ) /* string */ : ( $number1 * $number2 );
break;
case '/':
case 'div':
case 'divide':
if ( $bc ) {
$result = bcdiv( $number1, $number2, $precision ); // string, or NULL if right_operand is 0
}
elseif ( $number2 != 0 ) {
$result = ( $number1 / $number2 );
}
if ( ! isset( $result ) ) {
$result = 0;
}
break;
case '%':
case 'mod':
case 'modulus':
if ( $bc ) {
$result = bcmod( $number1, $number2, $precision ); // string, or NULL if modulus is 0.
}
elseif ( $number2 != 0 ) {
$result = ( $number1 % $number2 );
}
if ( ! isset( $result ) ) {
$result = 0;
}
break;
case '=':
case 'comp':
case 'compare':
$compare = true;
if ( $bc ) {
$result = bccomp( $number1, $number2, $precision ); // returns int 0, 1 or -1
}
else {
$result = ( $number1 == $number2 ) ? 0 : ( ( $number1 > $number2 ) ? 1 : - 1 );
}
break;
}
if ( isset( $result ) ) {
if ( $compare === false ) {
if ( $round === true ) {
$result = round( floatval( $result ), $decimals );
if ( $decimals === 0 ) {
$result = (int) $result;
}
}
else {
$result = ( intval( $result ) == $result ) ? intval( $result ) : floatval( $result );
}
}
return $result;
}
return false;
}
/**
* Wrapper for the PHP filter input function.
*
* This is used because stupidly enough, the `filter_input` function is not available on all hosts...
*
* @param int $type
* @param string $variable_name
* @param int $filter
*
* @return mixed
*/
public static function filter_input( $type, $variable_name, $filter = FILTER_DEFAULT ) {
return filter_input( $type, $variable_name, $filter );
}
/**
* Trim whitespace and NBSP (Non-breaking space) from string
*
* @param string $string
*
* @return string
*/
public static function trim_nbsp_from_string( $string ) {
$find = array( ' ', chr( 0xC2 ) . chr( 0xA0 ) );
$string = str_replace( $find, ' ', $string );
$string = trim( $string );
return $string;
}
/**
* Check if a string is a valid datetime
*
* @param string $datetime
*
* @return bool
*/
public static function is_valid_datetime( $datetime ) {
if ( substr( $datetime, 0, 1 ) != '-' ) {
try {
// Use the DateTime class ( PHP 5.2 > ) to check if the string is a valid datetime
if ( new DateTime( $datetime ) !== false ) {
return true;
}
}
catch( Exception $exc ) {
return false;
}
}
return false;
}
} /* End of class WPSEO_Utils */
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