Avoid warning on PHP 7.3
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@ -4687,7 +4687,7 @@ class Xls extends BaseReader
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$offset += 4;
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// offset: var; size: $us; character array of the URL, no Unicode string header, always 16-bit characters, zero-terminated
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$url = self::encodeUTF16(substr($recordData, $offset, $us - 2), false);
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$nullOffset = strpos($url, 0x00);
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$nullOffset = strpos($url, chr(0x00));
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if ($nullOffset) {
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$url = substr($url, 0, $nullOffset);
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}
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