71 lines
No EOL
2.7 KiB
PHP
71 lines
No EOL
2.7 KiB
PHP
<?php
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/**
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* takes a string of unicode entities and converts it to a utf-8 encoded string
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* each unicode entitiy has the form &#nnn(nn); n={0..9} and can be displayed by utf-8 supporting
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* browsers. Ascii will not be modified.
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* @param $source string of unicode entities [STRING]
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* @return a utf-8 encoded string [STRING]
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* @access public
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*/
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function charset_encode_utf_8 ($source) {
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$utf8Str = '';
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$entityArray = explode ("&#", $source);
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$size = count ($entityArray);
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for ($i = 0; $i < $size; $i++) {
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$subStr = $entityArray[$i];
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$nonEntity = strstr ($subStr, ';');
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if ($nonEntity !== false) {
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$unicode = intval (substr ($subStr, 0, (strpos ($subStr, ';') + 1)));
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// determine how many chars are needed to reprsent this unicode char
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if ($unicode < 128) {
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$utf8Substring = chr ($unicode);
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}
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else if ($unicode >= 128 && $unicode < 2048) {
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$binVal = str_pad (decbin ($unicode), 11, "0", STR_PAD_LEFT);
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$binPart1 = substr ($binVal, 0, 5);
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$binPart2 = substr ($binVal, 5);
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$char1 = chr (192 + bindec ($binPart1));
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$char2 = chr (128 + bindec ($binPart2));
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$utf8Substring = $char1 . $char2;
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}
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else if ($unicode >= 2048 && $unicode < 65536) {
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$binVal = str_pad (decbin ($unicode), 16, "0", STR_PAD_LEFT);
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$binPart1 = substr ($binVal, 0, 4);
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$binPart2 = substr ($binVal, 4, 6);
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$binPart3 = substr ($binVal, 10);
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$char1 = chr (224 + bindec ($binPart1));
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$char2 = chr (128 + bindec ($binPart2));
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$char3 = chr (128 + bindec ($binPart3));
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$utf8Substring = $char1 . $char2 . $char3;
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}
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else {
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$binVal = str_pad (decbin ($unicode), 21, "0", STR_PAD_LEFT);
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$binPart1 = substr ($binVal, 0, 3);
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$binPart2 = substr ($binVal, 3, 6);
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$binPart3 = substr ($binVal, 9, 6);
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$binPart4 = substr ($binVal, 15);
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$char1 = chr (240 + bindec ($binPart1));
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$char2 = chr (128 + bindec ($binPart2));
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$char3 = chr (128 + bindec ($binPart3));
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$char4 = chr (128 + bindec ($binPart4));
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$utf8Substring = $char1 . $char2 . $char3 . $char4;
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}
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if (strlen ($nonEntity) > 1)
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$nonEntity = substr ($nonEntity, 1); // chop the first char (';')
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else
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$nonEntity = '';
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$utf8Str .= $utf8Substring . $nonEntity;
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}
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else {
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$utf8Str .= $subStr;
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}
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}
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return $utf8Str;
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}
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?>
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