'utf-8' ] );
*
* `is_utf8_charset` should be used outside of this file.
*
* @ignore
* @since 6.6.1
*
* @param string $charset_slug Slug representing a text character encoding, or "charset".
* E.g. "UTF-8", "Windows-1252", "ISO-8859-1", "SJIS".
*
* @return bool Whether the slug represents the UTF-8 encoding.
*/
function _is_utf8_charset( $charset_slug ) {
if ( ! is_string( $charset_slug ) ) {
return false;
}
return (
0 === strcasecmp( 'UTF-8', $charset_slug ) ||
0 === strcasecmp( 'UTF8', $charset_slug )
);
}
if ( ! function_exists( 'mb_substr' ) ) :
/**
* Compat function to mimic mb_substr().
*
* @ignore
* @since 3.2.0
*
* @see _mb_substr()
*
* @param string $string The string to extract the substring from.
* @param int $start Position to being extraction from in `$string`.
* @param int|null $length Optional. Maximum number of characters to extract from `$string`.
* Default null.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return string Extracted substring.
*/
function mb_substr( $string, $start, $length = null, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
return _mb_substr( $string, $start, $length, $encoding );
}
endif;
/**
* Internal compat function to mimic mb_substr().
*
* Only supports UTF-8 and non-shifting single-byte encodings. For all other encodings
* expect the substrings to be misaligned. When the given encoding (or the `blog_charset`
* if none is provided) isn’t UTF-8 then the function returns the output of {@see \substr()}.
*
* @ignore
* @since 3.2.0
*
* @param string $str The string to extract the substring from.
* @param int $start Character offset at which to start the substring extraction.
* @param int|null $length Optional. Maximum number of characters to extract from `$str`.
* Default null.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return string Extracted substring.
*/
function _mb_substr( $str, $start, $length = null, $encoding = null ) {
if ( null === $str ) {
return '';
}
// The solution below works only for UTF-8; treat all other encodings as byte streams.
if ( ! _is_utf8_charset( $encoding ?? get_option( 'blog_charset' ) ) ) {
return is_null( $length ) ? substr( $str, $start ) : substr( $str, $start, $length );
}
$total_length = ( $start < 0 || $length < 0 )
? _wp_utf8_codepoint_count( $str )
: 0;
$normalized_start = $start < 0
? max( 0, $total_length + $start )
: $start;
/*
* The starting offset is provided as characters, which means this needs to
* find how many bytes that many characters occupies at the start of the string.
*/
$starting_byte_offset = _wp_utf8_codepoint_span( $str, 0, $normalized_start );
$normalized_length = $length < 0
? max( 0, $total_length - $normalized_start + $length )
: $length;
/*
* This is the main step. It finds how many bytes the given length of code points
* occupies in the input, starting at the byte offset calculated above.
*/
$byte_length = isset( $normalized_length )
? _wp_utf8_codepoint_span( $str, $starting_byte_offset, $normalized_length )
: ( strlen( $str ) - $starting_byte_offset );
// The result is a normal byte-level substring using the computed ranges.
return substr( $str, $starting_byte_offset, $byte_length );
}
if ( ! function_exists( 'mb_strlen' ) ) :
/**
* Compat function to mimic mb_strlen().
*
* @ignore
* @since 4.2.0
*
* @see _mb_strlen()
*
* @param string $string The string to retrieve the character length from.
* @param string|null $encoding Optional. Character encoding to use. Default null.
* @return int String length of `$string`.
*/
function mb_strlen( $string, $encoding = null ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.stringFound
return _mb_strlen( $string, $encoding );
}
endif;
/**
* Internal compat function to mimic mb_strlen().
*
* Only supports UTF-8 and non-shifting single-byte encodings. For all other
* encodings expect the counts to be wrong. When the given encoding (or the
* `blog_charset` if none is provided) isn’t UTF-8 then the function returns
* the byte-count of the provided string.
*
* @ignore
* @since 4.2.0
*
* @param string $str The string to retrieve the character length from.
* @param string|null $encoding Optional. Count characters according to this encoding.
* Default is to consult `blog_charset`.
* @return int Count of code points if UTF-8, byte length otherwise.
*/
function _mb_strlen( $str, $encoding = null ) {
return _is_utf8_charset( $encoding ?? get_option( 'blog_charset' ) )
? _wp_utf8_codepoint_count( $str )
: strlen( $str );
}
if ( ! function_exists( 'utf8_encode' ) ) :
if ( extension_loaded( 'mbstring' ) ) :
/**
* Converts a string from ISO-8859-1 to UTF-8.
*
* @deprecated Use {@see \mb_convert_encoding()} instead.
*
* @since 6.9.0
*
* @param string $iso_8859_1_text Text treated as ISO-8859-1 (latin1) bytes.
* @return string Text converted into a UTF-8.
*/
function utf8_encode( $iso_8859_1_text ): string {
_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
return mb_convert_encoding( $iso_8859_1_text, 'UTF-8', 'ISO-8859-1' );
}
else :
/**
* @ignore
* @private
*
* @since 6.9.0
*/
function utf8_encode( $iso_8859_1_text ): string {
_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
return _wp_utf8_encode_fallback( $iso_8859_1_text );
}
endif;
endif;
if ( ! function_exists( 'utf8_decode' ) ) :
if ( extension_loaded( 'mbstring' ) ) :
/**
* Converts a string from UTF-8 to ISO-8859-1.
*
* @deprecated Use {@see \mb_convert_encoding()} instead.
*
* @since 6.9.0
*
* @param string $utf8_text Text treated as UTF-8.
* @return string Text converted into ISO-8859-1.
*/
function utf8_decode( $utf8_text ): string {
_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
return mb_convert_encoding( $utf8_text, 'ISO-8859-1', 'UTF-8' );
}
else :
/**
* @ignore
* @private
*
* @since 6.9.0
*/
function utf8_decode( $utf8_text ): string {
_deprecated_function( __FUNCTION__, '6.9.0', 'mb_convert_encoding' );
return _wp_utf8_decode_fallback( $utf8_text );
}
endif;
endif;
// sodium_crypto_box() was introduced in PHP 7.2.
if ( ! function_exists( 'sodium_crypto_box' ) ) {
require ABSPATH . WPINC . '/sodium_compat/autoload.php';
}
if ( ! function_exists( 'is_countable' ) ) {
/**
* Polyfill for is_countable() function added in PHP 7.3.
*
* Verify that the content of a variable is an array or an object
* implementing the Countable interface.
*
* @since 4.9.6
*
* @param mixed $value The value to check.
* @return bool True if `$value` is countable, false otherwise.
*/
function is_countable( $value ) {
return ( is_array( $value )
|| $value instanceof Countable
|| $value instanceof SimpleXMLElement
|| $value instanceof ResourceBundle
);
}
}
if ( ! function_exists( 'array_key_first' ) ) {
/**
* Polyfill for array_key_first() function added in PHP 7.3.
*
* Get the first key of the given array without affecting
* the internal array pointer.
*
* @since 5.9.0
*
* @param array $array An array.
* @return string|int|null The first key of array if the array
* is not empty; `null` otherwise.
*/
function array_key_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
if ( empty( $array ) ) {
return null;
}
foreach ( $array as $key => $value ) {
return $key;
}
}
}
if ( ! function_exists( 'array_key_last' ) ) {
/**
* Polyfill for `array_key_last()` function added in PHP 7.3.
*
* Get the last key of the given array without affecting the
* internal array pointer.
*
* @since 5.9.0
*
* @param array $array An array.
* @return string|int|null The last key of array if the array
*. is not empty; `null` otherwise.
*/
function array_key_last( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound
if ( empty( $array ) ) {
return null;
}
end( $array );
return key( $array );
}
}
if ( ! function_exists( 'array_is_list' ) ) {
/**
* Polyfill for `array_is_list()` function added in PHP 8.1.
*
* Determines if the given array is a list.
*
* An array is considered a list if its keys consist of consecutive numbers from 0 to count($array)-1.
*
* @see https://github.com/symfony/polyfill-php81/tree/main
*
* @since 6.5.0
*
* @param array