Summery Summery
Callback function for preg_replace_callback.
Syntax Syntax
Description Description
Removes sequences of percent encoded bytes that represent UTF-8 encoded characters in iunreserved
Parameters Parameters
- $match
-
(Required) PCRE match
Return Return
(string) Replacement
Source Source
File: wp-includes/SimplePie/IRI.php
// Initialize the new string (this is what will be returned) and that // there are no bytes remaining in the current sequence (unsurprising // at the first byte!). $string = ''; $remaining = 0; // Loop over each and every byte, and set $value to its value for ($i = 1, $len = count($bytes); $i < $len; $i++) { $value = hexdec($bytes[$i]); // If we're the first byte of sequence: if (!$remaining) { // Start position $start = $i; // By default we are valid $valid = true; // One byte sequence: if ($value <= 0x7F) { $character = $value; $length = 1; } // Two byte sequence: elseif (($value & 0xE0) === 0xC0) { $character = ($value & 0x1F) << 6; $length = 2; $remaining = 1; } // Three byte sequence: elseif (($value & 0xF0) === 0xE0) { $character = ($value & 0x0F) << 12; $length = 3; $remaining = 2; } // Four byte sequence: elseif (($value & 0xF8) === 0xF0) { $character = ($value & 0x07) << 18; $length = 4; $remaining = 3; } // Invalid byte: else { $valid = false; $remaining = 0; } } // Continuation byte: else { // Check that the byte is valid, then add it to the character: if (($value & 0xC0) === 0x80) { $remaining--; $character |= ($value & 0x3F) << ($remaining * 6); } // If it is invalid, count the sequence as invalid and reprocess the current byte as the start of a sequence: else { $valid = false; $remaining = 0; $i--; } } // If we've reached the end of the current byte sequence, append it to Unicode::$data if (!$remaining) { // Percent encode anything invalid or not in iunreserved if ( // Invalid sequences !$valid // Non-shortest form sequences are invalid || $length > 1 && $character <= 0x7F || $length > 2 && $character <= 0x7FF || $length > 3 && $character <= 0xFFFF // Outside of range of iunreserved codepoints || $character < 0x2D || $character > 0xEFFFD // Noncharacters || ($character & 0xFFFE) === 0xFFFE || $character >= 0xFDD0 && $character <= 0xFDEF // Everything else not in iunreserved (this is all BMP) || $character === 0x2F || $character > 0x39 && $character < 0x41 || $character > 0x5A && $character < 0x61 || $character > 0x7A && $character < 0x7E || $character > 0x7E && $character < 0xA0 || $character > 0xD7FF && $character < 0xF900 ) { for ($j = $start; $j <= $i; $j++) { $string .= '%' . strtoupper($bytes[$j]); } } else { for ($j = $start; $j <= $i; $j++) { $string .= chr(hexdec($bytes[$j])); } } } } // If we have any bytes left over they are invalid (i.e., we are // mid-way through a multi-byte sequence) if ($remaining) { for ($j = $start; $j < $len; $j++) { $string .= '%' . strtoupper($bytes[$j]); } } return $string; } protected function scheme_normalization() { if (isset($this->normalization[$this->scheme]['iuserinfo']) && $this->iuserinfo === $this->normalization[$this->scheme]['iuserinfo']) {