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84 lines
1.9 KiB
PHP
84 lines
1.9 KiB
PHP
<?php
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//
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// This file provides some useful functions for debugging the unicode/UTF-8 library
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// It requires utf_tools.php to be loaded
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//
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die("Please read the first lines of this script for instructions on how to enable it");
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if (!headers_sent())
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{
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header('Content-type: text/html; charset=UTF-8');
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}
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/**
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* Converts unicode escape sequences (\u0123) into UTF-8 characters
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*
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* @param string A unicode sequence
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* @return string UTF-8 representation of the given unicode sequence
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*/
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function unicode_to_utf8($string)
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{
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$utf8 = '';
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for ($i = 0; $i < strlen($string); $i++)
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{
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if (isset($string[$i + 5]) && substr($string, $i, 2) == '\\u' && ctype_xdigit(substr($string, $i + 2, 4)))
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{
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$utf8 .= utf8_from_unicode(array(base_convert(substr($string, $i + 2, 4), 16, 10)));
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$i += 5;
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}
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else
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{
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$utf8 .= $string[$i];
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}
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}
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return $utf8;
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}
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/**
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* Takes an array of ints representing the Unicode characters and returns
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* a UTF-8 string.
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*
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* @param array $array array of unicode code points representing a string
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* @return string UTF-8 character string
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*/
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function utf8_from_unicode($array)
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{
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$str = '';
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foreach ($array as $value)
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{
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$str .= utf8_chr($value);
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}
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return $str;
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}
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/**
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* Converts a UTF-8 string to unicode code points
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*
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* @param string $text UTF-8 string
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* @return string Unicode code points
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*/
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function utf8_to_unicode($text)
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{
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return preg_replace_callback(
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'#[\\xC2-\\xF4][\\x80-\\xBF]?[\\x80-\\xBF]?[\\x80-\\xBF]#',
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'utf8_to_unicode_callback',
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preg_replace_callback(
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'#[\\x00-\\x7f]#',
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'utf8_to_unicode_callback',
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$text
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)
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);
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}
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/**
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* Takes a UTF-8 char and replaces it with its unicode escape sequence. Attention, $m is an array
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*
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* @param array $m 0-based numerically indexed array passed by preg_replace_callback()
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* @return string A unicode escape sequence
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*/
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function utf8_to_unicode_callback($m)
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{
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return '\u' . str_pad(base_convert(utf8_ord($m[0]), 10, 16), 4, '0', STR_PAD_LEFT) . '';
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}
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