Support formatted shared strings

Make the `->readString()` function more robust and work also with strings containing several formattings

Author: Alkarex

src/XlsxFastEditor.php

@@ -753,13 +753,16 @@ public function _getSharedString(int $stringNumber): ?string
 		$stringNumber++;	// Base 1
 
 		$xpath = $this->getXPathFromPath(self::SHARED_STRINGS_PATH);
-		$ts = $xpath->query("/o:sst/o:si[$stringNumber][1]/o:t[1]");
+		$ts = $xpath->query("/o:sst/o:si[$stringNumber]//o:t");
 		if ($ts !== false && $ts->length > 0) {
-			$t = $ts[0];
-			if (!($t instanceof \DOMElement)) {
-				throw new XlsxFastEditorXmlException("Error querying XML shared string {$stringNumber}!");
+			$text = '';
+			foreach ($ts as $t) {
+				if (!($t instanceof \DOMElement)) {
+					throw new XlsxFastEditorXmlException("Error querying XML shared string {$stringNumber}!");
+				}
+				$text .= $t->nodeValue;
 			}
-			return $t->nodeValue;
+			return $text;
 		}
 		return null;
 	}

tests/test.php

@@ -33,6 +33,7 @@
 	assert($xlsxFastEditor->readFloat($sheet1, 'e5') === null);
 	assert($xlsxFastEditor->readInt($sheet1, 'c3') === -5);
 	assert($xlsxFastEditor->readInt($sheet1, 'F6') === null);
+	assert($xlsxFastEditor->readString($sheet1, 'B3') === 'déjà-vu');
 	assert($xlsxFastEditor->readString($sheet1, 'b4') === 'naïveté');
 	assert($xlsxFastEditor->readString($sheet1, 'F7') === null);
 	assert($xlsxFastEditor->readHyperlink($sheet1, 'B4') === 'https://example.net/');