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<?php
/**
* A utility class that provides compatibility padding for multibyte string
* functionality.
*
* Taken mostly from {@link https://doc.wikimedia.org/mediawiki-core/master/php/Fallback_8php_source.html here}
*
* @since 4.7
*/
class WPRSS_MBString {
/**
* @since 4.7
* @param string $str
* @param int $start
* @param int|string $count
* @return string
*/
public static function mb_substr( $str, $start, $count = 'end' ) {
if ( function_exists( 'mb_substr' ) ) {
return mb_substr( $str, $start );
}
if ( $start != 0 ) {
$split = self::mb_substr_split_unicode( $str, intval( $start ) );
$str = substr( $str, $split );
}
if ( $count !== 'end' ) {
$split = self::mb_substr_split_unicode( $str, intval( $count ) );
$str = substr( $str, 0, $split );
}
return $str;
}
/**
* @since 4.7
* @param string $str
* @param int $splitPos
* @return int
*/
public static function mb_substr_split_unicode( $str, $splitPos ) {
if ( $splitPos == 0 ) {
return 0;
}
$byteLen = strlen( $str );
if ( $splitPos > 0 ) {
if ( $splitPos > 256 ) {
// Optimize large string offsets by skipping ahead N bytes.
// This will cut out most of our slow time on Latin-based text,
// and 1/2 to 1/3 on East European and Asian scripts.
$bytePos = $splitPos;
while ( $bytePos < $byteLen && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
++$bytePos;
}
$charPos = mb_strlen( substr( $str, 0, $bytePos ) );
} else {
$charPos = 0;
$bytePos = 0;
}
while ( $charPos++ < $splitPos ) {
++$bytePos;
// Move past any tail bytes
while ( $bytePos < $byteLen && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
++$bytePos;
}
}
} else {
$splitPosX = $splitPos + 1;
$charPos = 0; // relative to end of string; we don't care about the actual char position here
$bytePos = $byteLen;
while ( $bytePos > 0 && $charPos-- >= $splitPosX ) {
--$bytePos;
// Move past any tail bytes
while ( $bytePos > 0 && $str[$bytePos] >= "\x80" && $str[$bytePos] < "\xc0" ) {
--$bytePos;
}
}
}
return $bytePos;
}
/**
* @since 4.7
* @param string $str
* @return int
*/
public static function mb_strlen( $str, $enc = '' ) {
if ( function_exists( 'mb_strlen' ) ) {
return mb_strlen( $str );
}
$counts = count_chars( $str );
$total = 0;
// Count ASCII bytes
for ( $i = 0; $i < 0x80; $i++ ) {
$total += $counts[$i];
}
// Count multibyte sequence heads
for ( $i = 0xc0; $i < 0xff; $i++ ) {
$total += $counts[$i];
}
return $total;
}
/**
* @since 4.7
* @param string $haystack
* @param string $needle
* @param int $offset
* @return int|boolean
*/
public static function mb_strpos( $haystack, $needle, $offset = 0, $encoding = '' ) {
if ( function_exists( 'mb_strpos' ) ) {
return mb_strpos( $haystack, $needle, $offset );
}
$needle = preg_quote( $needle, '/' );
$ar = array();
preg_match( '/' . $needle . '/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
if ( isset( $ar[0][1] ) ) {
return $ar[0][1];
} else {
return false;
}
}
/**
* @since 4.7
* @param string $haystack
* @param string $needle
* @param int $offset
* @return int|boolean
*/
public static function mb_stripos( $haystack, $needle, $offset = 0, $encoding = '' ) {
if ( function_exists( 'mb_stripos' ) ) {
return mb_stripos( $haystack, $needle, $offset );
}
$needle = preg_quote( $needle, '/' );
$ar = array();
preg_match( '/' . $needle . '/ui', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
if ( isset( $ar[0][1] ) ) {
return $ar[0][1];
} else {
return false;
}
}
/**
* @since 4.7
* @param string $haystack
* @param string $needle
* @param int $offset
* @return int|boolean
*/
public static function mb_strrpos( $haystack, $needle, $offset = 0, $encoding = '' ) {
if ( function_exists( 'mb_strrpos' ) ) {
return mb_strrpos( $haystack, $needle, $offset );
}
$needle = preg_quote( $needle, '/' );
$ar = array();
preg_match_all( '/' . $needle . '/u', $haystack, $ar, PREG_OFFSET_CAPTURE, $offset );
if ( isset( $ar[0] ) && count( $ar[0] ) > 0 && isset( $ar[0][count( $ar[0] ) - 1][1] ) ) {
return $ar[0][count( $ar[0] ) - 1][1];
} else {
return false;
}
}
/**
* Lowercase a UTF-8 string.
* This supports accented letters, but nothing more.
* Taken from {@link https://github.com/drupal/drupal/blob/9.x/core/includes/unicode.inc#L432 here}.
*
* @since 4.7
* @param string $text The string to run the operation on.
* @return string The string in lowercase.
*/
public static function mb_strtolower( $text ) {
if ( function_exists( 'mb_strtolower' ) )
return mb_strtolower( $text );
// Use C-locale for ASCII-only lowercase
$text = strtolower( $text );
// Case flip Latin-1 accented letters
$text = preg_replace_callback( '/\xC3[\x80-\x96\x98-\x9E]/', array( __CLASS__, '_unicode_caseflip' ), $text );
return $text;
}
/**
* Flips U+C0-U+DE to U+E0-U+FD and back.
*
* @since 4.7
* @param $matches An array of matches.
* @return array The Latin-1 version of the array of matches.
* @see mb_strtolower()
*/
public static function _unicode_caseflip( $matches ) {
return $matches[0][0] . chr( ord( $matches[0][1] ) ^ 32 );
}
}