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<?
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function split_line($str, $prefix = "", $width = 76, $lines_limit = PHP_INT_MAX)
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{
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if ($width <= 0)
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return $str;
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$result = "";
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$len = strlen($str);
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$prefix_len = mb_strlen($prefix, 'UTF-8');
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$lines_count = 0;
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$line = $prefix;
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$line_len = $prefix_len;
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for($i = 0; $i < $len && $lines_count < $lines_limit; $i++)
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{
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$c = $str[$i];
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// Skip special characters
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if ($c == "\r" || $c == "\7")
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{
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continue;
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}
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if ($c == "\n")
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{
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$result .= ($line . "\n");
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$lines_count++;
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$line = $prefix;
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$line_len = $prefix_len;
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continue;
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}
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// Process UTF-8 Chinese characters
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$v1 = ord($c);
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if (($v1 & 0b10000000) == 0b10000000) //head of multi-byte character
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{
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$v2 = ($v1 & 0b01111000) << 1;
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while ($v2 & 0b10000000)
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{
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$i++;
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$v3 = $str[$i];
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$c .= $v3;
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$v2 = ($v2 & 0b01111111 ) << 1;
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}
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// Each UTF-8 CJK character should use two character length for display
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if ($line_len + 2 > $width)
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{
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$result .= ($line . "\n");
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$lines_count++;
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$line = $prefix;
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$line_len = $prefix_len;
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}
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$line_len += 2;
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}
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else
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{
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$line_len++;
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}
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$line .= $c;
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if ($line_len >= $width)
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{
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$result .= ($line . "\n");
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$lines_count++;
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$line = $prefix;
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$line_len = $prefix_len;
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}
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}
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$result .= ($line . "\n");
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return $result;
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}
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?>
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