Automated native_function_invocation fixes

src/Spout/Writer/Common/Creator/WriterEntityFactory.php

@@ -98,7 +98,7 @@ class WriterEntityFactory
      */
     public static function createRowFromArray(array $cellValues = [], Style $rowStyle = null)
     {
-        $cells = array_map(function ($cellValue) {
+        $cells = \array_map(function ($cellValue) {
             return new Cell($cellValue);
         }, $cellValues);
 

src/Spout/Writer/Common/Creator/WriterFactory.php

@@ -35,7 +35,7 @@ class WriterFactory
      */
     public static function createFromFile(string $path)
     {
-        $extension = strtolower(pathinfo($path, PATHINFO_EXTENSION));
+        $extension = \strtolower(\pathinfo($path, PATHINFO_EXTENSION));
 
         return self::createFromType($extension);
     }

src/Spout/Writer/Common/Entity/Workbook.php

@@ -19,7 +19,7 @@ class Workbook
      */
     public function __construct()
     {
-        $this->internalId = uniqid();
+        $this->internalId = \uniqid();
     }
 
     /**

src/Spout/Writer/Common/Helper/CellHelper.php

@@ -28,11 +28,11 @@ class CellHelper
         // Using isset here because it is way faster than array_key_exists...
         if (!isset(self::$columnIndexToColumnLettersCache[$originalColumnIndex])) {
             $columnLetters = '';
-            $capitalAAsciiValue = ord('A');
+            $capitalAAsciiValue = \ord('A');
 
             do {
                 $modulus = $columnIndexZeroBased % 26;
-                $columnLetters = chr($capitalAAsciiValue + $modulus) . $columnLetters;
+                $columnLetters = \chr($capitalAAsciiValue + $modulus) . $columnLetters;
 
                 // substracting 1 because it's zero-based
                 $columnIndexZeroBased = (int) ($columnIndexZeroBased / 26) - 1;

src/Spout/Writer/Common/Helper/ZipHelper.php

@@ -135,7 +135,7 @@ class ZipHelper
     public static function canChooseCompressionMethod()
     {
         // setCompressionName() is a PHP7+ method...
-        return (method_exists(new \ZipArchive(), 'setCompressionName'));
+        return (\method_exists(new \ZipArchive(), 'setCompressionName'));
     }
 
     /**
@@ -151,7 +151,7 @@ class ZipHelper
 
         foreach ($itemIterator as $itemInfo) {
             $itemRealPath = $this->getNormalizedRealPath($itemInfo->getPathname());
-            $itemLocalPath = str_replace($folderRealPath, '', $itemRealPath);
+            $itemLocalPath = \str_replace($folderRealPath, '', $itemRealPath);
 
             if ($itemInfo->isFile() && !$this->shouldSkipFile($zip, $itemLocalPath, $existingFileMode)) {
                 $zip->addFile($itemRealPath, $itemLocalPath);
@@ -181,9 +181,9 @@ class ZipHelper
      */
     protected function getNormalizedRealPath($path)
     {
-        $realPath = realpath($path);
+        $realPath = \realpath($path);
 
-        return str_replace(DIRECTORY_SEPARATOR, '/', $realPath);
+        return \str_replace(DIRECTORY_SEPARATOR, '/', $realPath);
     }
 
     /**
@@ -210,8 +210,8 @@ class ZipHelper
      */
     protected function copyZipToStream($zipFilePath, $pointer)
     {
-        $zipFilePointer = fopen($zipFilePath, 'r');
-        stream_copy_to_stream($zipFilePointer, $pointer);
-        fclose($zipFilePointer);
+        $zipFilePointer = \fopen($zipFilePath, 'r');
+        \stream_copy_to_stream($zipFilePointer, $pointer);
+        \fclose($zipFilePointer);
     }
 }

src/Spout/Writer/Common/Manager/SheetManager.php

@@ -45,8 +45,8 @@ class SheetManager
      */
     public function throwIfNameIsInvalid($name, Sheet $sheet)
     {
-        if (!is_string($name)) {
-            $actualType = gettype($name);
+        if (!\is_string($name)) {
+            $actualType = \gettype($name);
             $errorMessage = "The sheet's name is invalid. It must be a string ($actualType given).";
             throw new InvalidSheetNameException($errorMessage);
         }
@@ -74,9 +74,9 @@ class SheetManager
             }
         }
 
-        if (count($failedRequirements) !== 0) {
+        if (\count($failedRequirements) !== 0) {
             $errorMessage = "The sheet's name (\"$name\") is invalid. It did not respect these rules:\n - ";
-            $errorMessage .= implode("\n - ", $failedRequirements);
+            $errorMessage .= \implode("\n - ", $failedRequirements);
             throw new InvalidSheetNameException($errorMessage);
         }
     }
@@ -90,7 +90,7 @@ class SheetManager
      */
     private function doesContainInvalidCharacters($name)
     {
-        return (str_replace(self::$INVALID_CHARACTERS_IN_SHEET_NAME, '', $name) !== $name);
+        return (\str_replace(self::$INVALID_CHARACTERS_IN_SHEET_NAME, '', $name) !== $name);
     }
 
     /**

src/Spout/Writer/Common/Manager/Style/StyleManager.php

@@ -80,7 +80,7 @@ class StyleManager implements StyleManagerInterface
             return $cellStyle;
         }
 
-        if ($cell->isString() && strpos($cell->getValue(), "\n") !== false) {
+        if ($cell->isString() && \strpos($cell->getValue(), "\n") !== false) {
             $cellStyle->setShouldWrapText();
         }
 

src/Spout/Writer/Common/Manager/Style/StyleRegistry.php

@@ -37,7 +37,7 @@ class StyleRegistry
         $serializedStyle = $this->serialize($style);
 
         if (!$this->hasStyleAlreadyBeenRegistered($style)) {
-            $nextStyleId = count($this->serializedStyleToStyleIdMappingTable);
+            $nextStyleId = \count($this->serializedStyleToStyleIdMappingTable);
             $style->setId($nextStyleId);
 
             $this->serializedStyleToStyleIdMappingTable[$serializedStyle] = $nextStyleId;
@@ -79,7 +79,7 @@ class StyleRegistry
      */
     public function getRegisteredStyles()
     {
-        return array_values($this->styleIdToStyleMappingTable);
+        return \array_values($this->styleIdToStyleMappingTable);
     }
 
     /**
@@ -105,7 +105,7 @@ class StyleRegistry
         $currentId = $style->getId();
         $style->setId(0);
 
-        $serializedStyle = serialize($style);
+        $serializedStyle = \serialize($style);
 
         $style->setId($currentId);
 

src/Spout/Writer/Common/Manager/WorkbookManagerAbstract.php

@@ -124,7 +124,7 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
     {
         $worksheets = $this->getWorksheets();
 
-        $newSheetIndex = count($worksheets);
+        $newSheetIndex = \count($worksheets);
         $sheetManager = $this->managerFactory->createSheetManager();
         $sheet = $this->entityFactory->createSheet($newSheetIndex, $this->workbook->getInternalId(), $sheetManager);
 
@@ -260,7 +260,7 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
         // update max num columns for the worksheet
         $currentMaxNumColumns = $worksheet->getMaxNumColumns();
         $cellsCount = $row->getNumCells();
-        $worksheet->setMaxNumColumns(max($currentMaxNumColumns, $cellsCount));
+        $worksheet->setMaxNumColumns(\max($currentMaxNumColumns, $cellsCount));
     }
 
     /**

src/Spout/Writer/Exception/Border/InvalidNameException.php

@@ -11,6 +11,6 @@ class InvalidNameException extends WriterException
     {
         $msg = '%s is not a valid name identifier for a border. Valid identifiers are: %s.';
 
-        parent::__construct(sprintf($msg, $name, implode(',', BorderPart::getAllowedNames())));
+        parent::__construct(\sprintf($msg, $name, \implode(',', BorderPart::getAllowedNames())));
     }
 }

src/Spout/Writer/Exception/Border/InvalidStyleException.php

@@ -11,6 +11,6 @@ class InvalidStyleException extends WriterException
     {
         $msg = '%s is not a valid style identifier for a border. Valid identifiers are: %s.';
 
-        parent::__construct(sprintf($msg, $name, implode(',', BorderPart::getAllowedStyles())));
+        parent::__construct(\sprintf($msg, $name, \implode(',', BorderPart::getAllowedStyles())));
     }
 }

src/Spout/Writer/Exception/Border/InvalidWidthException.php

@@ -11,6 +11,6 @@ class InvalidWidthException extends WriterException
     {
         $msg = '%s is not a valid width identifier for a border. Valid identifiers are: %s.';
 
-        parent::__construct(sprintf($msg, $name, implode(',', BorderPart::getAllowedWidths())));
+        parent::__construct(\sprintf($msg, $name, \implode(',', BorderPart::getAllowedWidths())));
     }
 }

src/Spout/Writer/ODS/Helper/BorderHelper.php

@@ -53,14 +53,14 @@ class BorderHelper
         $definition = 'fo:border-%s="%s"';
 
         if ($borderPart->getStyle() === Border::STYLE_NONE) {
-            $borderPartDefinition = sprintf($definition, $borderPart->getName(), 'none');
+            $borderPartDefinition = \sprintf($definition, $borderPart->getName(), 'none');
         } else {
             $attributes = [
                 self::$widthMap[$borderPart->getWidth()],
                 self::$styleMap[$borderPart->getStyle()],
                 '#' . $borderPart->getColor(),
             ];
-            $borderPartDefinition = sprintf($definition, $borderPart->getName(), implode(' ', $attributes));
+            $borderPartDefinition = \sprintf($definition, $borderPart->getName(), \implode(' ', $attributes));
         }
 
         return $borderPartDefinition;

src/Spout/Writer/ODS/Helper/FileSystemHelper.php

@@ -89,7 +89,7 @@ class FileSystemHelper extends \Box\Spout\Common\Helper\FileSystemHelper impleme
      */
     protected function createRootFolder()
     {
-        $this->rootFolder = $this->createFolder($this->baseFolderRealPath, uniqid('ods'));
+        $this->rootFolder = $this->createFolder($this->baseFolderRealPath, \uniqid('ods'));
 
         return $this;
     }
@@ -210,22 +210,22 @@ EOD;
 
         // Append sheets content to "content.xml"
         $contentXmlFilePath = $this->rootFolder . '/' . self::CONTENT_XML_FILE_NAME;
-        $contentXmlHandle = fopen($contentXmlFilePath, 'a');
+        $contentXmlHandle = \fopen($contentXmlFilePath, 'a');
 
         foreach ($worksheets as $worksheet) {
             // write the "<table:table>" node, with the final sheet's name
-            fwrite($contentXmlHandle, $worksheetManager->getTableElementStartAsString($worksheet));
+            \fwrite($contentXmlHandle, $worksheetManager->getTableElementStartAsString($worksheet));
 
             $worksheetFilePath = $worksheet->getFilePath();
             $this->copyFileContentsToTarget($worksheetFilePath, $contentXmlHandle);
 
-            fwrite($contentXmlHandle, '</table:table>');
+            \fwrite($contentXmlHandle, '</table:table>');
         }
 
         $contentXmlFileContents = '</office:spreadsheet></office:body></office:document-content>';
 
-        fwrite($contentXmlHandle, $contentXmlFileContents);
-        fclose($contentXmlHandle);
+        \fwrite($contentXmlHandle, $contentXmlFileContents);
+        \fclose($contentXmlHandle);
 
         return $this;
     }
@@ -241,9 +241,9 @@ EOD;
      */
     protected function copyFileContentsToTarget($sourceFilePath, $targetResource)
     {
-        $sourceHandle = fopen($sourceFilePath, 'r');
-        stream_copy_to_stream($sourceHandle, $targetResource);
-        fclose($sourceHandle);
+        $sourceHandle = \fopen($sourceFilePath, 'r');
+        \stream_copy_to_stream($sourceHandle, $targetResource);
+        \fclose($sourceHandle);
     }
 
     /**

src/Spout/Writer/ODS/Manager/OptionsManager.php

@@ -42,7 +42,7 @@ class OptionsManager extends OptionsManagerAbstract
      */
     protected function setDefaultOptions()
     {
-        $this->setOption(Options::TEMP_FOLDER, sys_get_temp_dir());
+        $this->setOption(Options::TEMP_FOLDER, \sys_get_temp_dir());
         $this->setOption(Options::DEFAULT_ROW_STYLE, $this->styleBuilder->build());
         $this->setOption(Options::SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY, true);
     }

src/Spout/Writer/ODS/Manager/Style/StyleManager.php

@@ -295,7 +295,7 @@ EOD;
      */
     private function getCellAlignmentSectionContent($style)
     {
-        return sprintf(
+        return \sprintf(
             ' fo:text-align="%s" ',
             $this->transformCellAlignment($style->getCellAlignment())
         );
@@ -364,11 +364,11 @@ EOD;
      */
     private function getBorderXMLContent($style)
     {
-        $borders = array_map(function (BorderPart $borderPart) {
+        $borders = \array_map(function (BorderPart $borderPart) {
             return BorderHelper::serializeBorderPart($borderPart);
         }, $style->getBorder()->getParts());
 
-        return sprintf(' %s ', implode(' ', $borders));
+        return \sprintf(' %s ', \implode(' ', $borders));
     }
 
     /**
@@ -379,6 +379,6 @@ EOD;
      */
     private function getBackgroundColorXMLContent($style)
     {
-        return sprintf(' fo:background-color="#%s" ', $style->getBackgroundColor());
+        return \sprintf(' fo:background-color="#%s" ', $style->getBackgroundColor());
     }
 }

src/Spout/Writer/ODS/Manager/Style/StyleRegistry.php

@@ -33,6 +33,6 @@ class StyleRegistry extends \Box\Spout\Writer\Common\Manager\Style\StyleRegistry
      */
     public function getUsedFonts()
     {
-        return array_keys($this->usedFontsSet);
+        return \array_keys($this->usedFontsSet);
     }
 }

src/Spout/Writer/ODS/Manager/WorkbookManager.php

@@ -56,7 +56,7 @@ class WorkbookManager extends WorkbookManagerAbstract
     protected function writeAllFilesToDiskAndZipThem($finalFilePointer)
     {
         $worksheets = $this->getWorksheets();
-        $numWorksheets = count($worksheets);
+        $numWorksheets = \count($worksheets);
 
         $this->fileSystemHelper
             ->createContentFile($this->worksheetManager, $this->styleManager, $worksheets)

src/Spout/Writer/ODS/Manager/WorksheetManager.php

@@ -61,7 +61,7 @@ class WorksheetManager implements WorksheetManagerInterface
      */
     public function startSheet(Worksheet $worksheet)
     {
-        $sheetFilePointer = fopen($worksheet->getFilePath(), 'w');
+        $sheetFilePointer = \fopen($worksheet->getFilePath(), 'w');
         $this->throwIfSheetFilePointerIsNotAvailable($sheetFilePointer);
 
         $worksheet->setFilePointer($sheetFilePointer);
@@ -134,7 +134,7 @@ class WorksheetManager implements WorksheetManagerInterface
 
         $data .= '</table:table-row>';
 
-        $wasWriteSuccessful = fwrite($worksheet->getFilePointer(), $data);
+        $wasWriteSuccessful = \fwrite($worksheet->getFilePointer(), $data);
         if ($wasWriteSuccessful === false) {
             throw new IOException("Unable to write data in {$worksheet->getFilePath()}");
         }
@@ -190,7 +190,7 @@ class WorksheetManager implements WorksheetManagerInterface
         if ($cell->isString()) {
             $data .= ' office:value-type="string" calcext:value-type="string">';
 
-            $cellValueLines = explode("\n", $cell->getValue());
+            $cellValueLines = \explode("\n", $cell->getValue());
             foreach ($cellValueLines as $cellValueLine) {
                 $data .= '<text:p>' . $this->stringsEscaper->escape($cellValueLine) . '</text:p>';
             }
@@ -207,7 +207,7 @@ class WorksheetManager implements WorksheetManagerInterface
         } elseif ($cell->isEmpty()) {
             $data .= '/>';
         } else {
-            throw new InvalidArgumentException('Trying to add a value with an unsupported type: ' . gettype($cell->getValue()));
+            throw new InvalidArgumentException('Trying to add a value with an unsupported type: ' . \gettype($cell->getValue()));
         }
 
         return $data;
@@ -223,10 +223,10 @@ class WorksheetManager implements WorksheetManagerInterface
     {
         $worksheetFilePointer = $worksheet->getFilePointer();
 
-        if (!is_resource($worksheetFilePointer)) {
+        if (!\is_resource($worksheetFilePointer)) {
             return;
         }
 
-        fclose($worksheetFilePointer);
+        \fclose($worksheetFilePointer);
     }
 }

src/Spout/Writer/WriterAbstract.php

@@ -223,7 +223,7 @@ abstract class WriterAbstract implements WriterInterface
 
         $this->closeWriter();
 
-        if (is_resource($this->filePointer)) {
+        if (\is_resource($this->filePointer)) {
             $this->globalFunctionsHelper->fclose($this->filePointer);
         }
 
@@ -243,7 +243,7 @@ abstract class WriterAbstract implements WriterInterface
 
         // remove output file if it was created
         if ($this->globalFunctionsHelper->file_exists($this->outputFilePath)) {
-            $outputFolderPath = dirname($this->outputFilePath);
+            $outputFolderPath = \dirname($this->outputFilePath);
             $fileSystemHelper = $this->helperFactory->createFileSystemHelper($outputFolderPath);
             $fileSystemHelper->deleteFile($this->outputFilePath);
         }

src/Spout/Writer/XLSX/Helper/BorderHelper.php

@@ -43,8 +43,8 @@ class BorderHelper
     {
         $borderStyle = self::getBorderStyle($borderPart);
 
-        $colorEl = $borderPart->getColor() ? sprintf('<color rgb="%s"/>', $borderPart->getColor()) : '';
-        $partEl = sprintf(
+        $colorEl = $borderPart->getColor() ? \sprintf('<color rgb="%s"/>', $borderPart->getColor()) : '';
+        $partEl = \sprintf(
             '<%s style="%s">%s</%s>',
             $borderPart->getName(),
             $borderStyle,

src/Spout/Writer/XLSX/Helper/FileSystemHelper.php

@@ -112,7 +112,7 @@ class FileSystemHelper extends \Box\Spout\Common\Helper\FileSystemHelper impleme
      */
     private function createRootFolder()
     {
-        $this->rootFolder = $this->createFolder($this->baseFolderRealPath, uniqid('xlsx', true));
+        $this->rootFolder = $this->createFolder($this->baseFolderRealPath, \uniqid('xlsx', true));
 
         return $this;
     }

src/Spout/Writer/XLSX/Manager/OptionsManager.php

@@ -52,7 +52,7 @@ class OptionsManager extends OptionsManagerAbstract
             ->setFontName(self::DEFAULT_FONT_NAME)
             ->build();
 
-        $this->setOption(Options::TEMP_FOLDER, sys_get_temp_dir());
+        $this->setOption(Options::TEMP_FOLDER, \sys_get_temp_dir());
         $this->setOption(Options::DEFAULT_ROW_STYLE, $defaultRowStyle);
         $this->setOption(Options::SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY, true);
         $this->setOption(Options::SHOULD_USE_INLINE_STRINGS, true);

src/Spout/Writer/XLSX/Manager/SharedStringsManager.php

@@ -40,13 +40,13 @@ EOD;
     public function __construct($xlFolder, $stringsEscaper)
     {
         $sharedStringsFilePath = $xlFolder . '/' . self::SHARED_STRINGS_FILE_NAME;
-        $this->sharedStringsFilePointer = fopen($sharedStringsFilePath, 'w');
+        $this->sharedStringsFilePointer = \fopen($sharedStringsFilePath, 'w');
 
         $this->throwIfSharedStringsFilePointerIsNotAvailable();
 
         // the headers is split into different parts so that we can fseek and put in the correct count and uniqueCount later
         $header = self::SHARED_STRINGS_XML_FILE_FIRST_PART_HEADER . ' ' . self::DEFAULT_STRINGS_COUNT_PART . '>';
-        fwrite($this->sharedStringsFilePointer, $header);
+        \fwrite($this->sharedStringsFilePointer, $header);
 
         $this->stringsEscaper = $stringsEscaper;
     }
@@ -73,7 +73,7 @@ EOD;
      */
     public function writeString($string)
     {
-        fwrite($this->sharedStringsFilePointer, '<si><t xml:space="preserve">' . $this->stringsEscaper->escape($string) . '</t></si>');
+        \fwrite($this->sharedStringsFilePointer, '<si><t xml:space="preserve">' . $this->stringsEscaper->escape($string) . '</t></si>');
         $this->numSharedStrings++;
 
         // Shared string ID is zero-based
@@ -87,20 +87,20 @@ EOD;
      */
     public function close()
     {
-        if (!is_resource($this->sharedStringsFilePointer)) {
+        if (!\is_resource($this->sharedStringsFilePointer)) {
             return;
         }
 
-        fwrite($this->sharedStringsFilePointer, '</sst>');
+        \fwrite($this->sharedStringsFilePointer, '</sst>');
 
         // Replace the default strings count with the actual number of shared strings in the file header
-        $firstPartHeaderLength = strlen(self::SHARED_STRINGS_XML_FILE_FIRST_PART_HEADER);
-        $defaultStringsCountPartLength = strlen(self::DEFAULT_STRINGS_COUNT_PART);
+        $firstPartHeaderLength = \strlen(self::SHARED_STRINGS_XML_FILE_FIRST_PART_HEADER);
+        $defaultStringsCountPartLength = \strlen(self::DEFAULT_STRINGS_COUNT_PART);
 
         // Adding 1 to take into account the space between the last xml attribute and "count"
-        fseek($this->sharedStringsFilePointer, $firstPartHeaderLength + 1);
-        fwrite($this->sharedStringsFilePointer, sprintf("%-{$defaultStringsCountPartLength}s", 'count="' . $this->numSharedStrings . '" uniqueCount="' . $this->numSharedStrings . '"'));
+        \fseek($this->sharedStringsFilePointer, $firstPartHeaderLength + 1);
+        \fwrite($this->sharedStringsFilePointer, \sprintf("%-{$defaultStringsCountPartLength}s", 'count="' . $this->numSharedStrings . '" uniqueCount="' . $this->numSharedStrings . '"'));
 
-        fclose($this->sharedStringsFilePointer);
+        \fclose($this->sharedStringsFilePointer);
     }
 }

src/Spout/Writer/XLSX/Manager/Style/StyleManager.php

@@ -88,8 +88,8 @@ EOD;
             $format = $style->getFormat();
             $tags[] = '<numFmt numFmtId="' . $numFmtId . '" formatCode="' . $format . '"/>';
         }
-        $content = '<numFmts count="' . count($tags) . '">';
-        $content .= implode('', $tags);
+        $content = '<numFmts count="' . \count($tags) . '">';
+        $content .= \implode('', $tags);
         $content .= '</numFmts>';
 
         return $content;
@@ -104,7 +104,7 @@ EOD;
     {
         $registeredStyles = $this->styleRegistry->getRegisteredStyles();
 
-        $content = '<fonts count="' . count($registeredStyles) . '">';
+        $content = '<fonts count="' . \count($registeredStyles) . '">';
 
         /** @var Style $style */
         foreach ($registeredStyles as $style) {
@@ -145,8 +145,8 @@ EOD;
         $registeredFills = $this->styleRegistry->getRegisteredFills();
 
         // Excel reserves two default fills
-        $fillsCount = count($registeredFills) + 2;
-        $content = sprintf('<fills count="%d">', $fillsCount);
+        $fillsCount = \count($registeredFills) + 2;
+        $content = \sprintf('<fills count="%d">', $fillsCount);
 
         $content .= '<fill><patternFill patternType="none"/></fill>';
         $content .= '<fill><patternFill patternType="gray125"/></fill>';
@@ -157,7 +157,7 @@ EOD;
             $style = $this->styleRegistry->getStyleFromStyleId($styleId);
 
             $backgroundColor = $style->getBackgroundColor();
-            $content .= sprintf(
+            $content .= \sprintf(
                 '<fill><patternFill patternType="solid"><fgColor rgb="%s"/></patternFill></fill>',
                 $backgroundColor
             );
@@ -178,7 +178,7 @@ EOD;
         $registeredBorders = $this->styleRegistry->getRegisteredBorders();
 
         // There is one default border with index 0
-        $borderCount = count($registeredBorders) + 1;
+        $borderCount = \count($registeredBorders) + 1;
 
         $content = '<borders count="' . $borderCount . '">';
 
@@ -233,7 +233,7 @@ EOD;
     {
         $registeredStyles = $this->styleRegistry->getRegisteredStyles();
 
-        $content = '<cellXfs count="' . count($registeredStyles) . '">';
+        $content = '<cellXfs count="' . \count($registeredStyles) . '">';
 
         foreach ($registeredStyles as $style) {
             $styleId = $style->getId();
@@ -247,13 +247,13 @@ EOD;
                 $content .= ' applyFont="1"';
             }
 
-            $content .= sprintf(' applyBorder="%d"', $style->shouldApplyBorder() ? 1 : 0);
+            $content .= \sprintf(' applyBorder="%d"', $style->shouldApplyBorder() ? 1 : 0);
 
             if ($style->shouldApplyCellAlignment() || $style->shouldWrapText()) {
                 $content .= ' applyAlignment="1">';
                 $content .= '<alignment';
                 if ($style->shouldApplyCellAlignment()) {
-                    $content .= sprintf(' horizontal="%s"', $style->getCellAlignment());
+                    $content .= \sprintf(' horizontal="%s"', $style->getCellAlignment());
                 }
                 if ($style->shouldWrapText()) {
                     $content .= ' wrapText="1"';

src/Spout/Writer/XLSX/Manager/Style/StyleRegistry.php

@@ -221,7 +221,7 @@ class StyleRegistry extends \Box\Spout\Writer\Common\Manager\Style\StyleRegistry
 
         if ($style->shouldApplyBorder()) {
             $border = $style->getBorder();
-            $serializedBorder = serialize($border);
+            $serializedBorder = \serialize($border);
 
             $isBorderAlreadyRegistered = isset($this->registeredBorders[$serializedBorder]);
 
@@ -231,7 +231,7 @@ class StyleRegistry extends \Box\Spout\Writer\Common\Manager\Style\StyleRegistry
                 $this->styleIdToBorderMappingTable[$styleId] = $registeredBorderId;
             } else {
                 $this->registeredBorders[$serializedBorder] = $styleId;
-                $this->styleIdToBorderMappingTable[$styleId] = count($this->registeredBorders);
+                $this->styleIdToBorderMappingTable[$styleId] = \count($this->registeredBorders);
             }
         } else {
             // If no border should be applied - the mapping is the default border: 0

src/Spout/Writer/XLSX/Manager/WorkbookManager.php

@@ -44,7 +44,7 @@ class WorkbookManager extends WorkbookManagerAbstract
     {
         $worksheetFilesFolder = $this->fileSystemHelper->getXlWorksheetsFolder();
 
-        return $worksheetFilesFolder . '/' . strtolower($sheet->getName()) . '.xml';
+        return $worksheetFilesFolder . '/' . \strtolower($sheet->getName()) . '.xml';
     }
 
     /**

src/Spout/Writer/XLSX/Manager/WorksheetManager.php

@@ -107,13 +107,13 @@ EOD;
      */
     public function startSheet(Worksheet $worksheet)
     {
-        $sheetFilePointer = fopen($worksheet->getFilePath(), 'w');
+        $sheetFilePointer = \fopen($worksheet->getFilePath(), 'w');
         $this->throwIfSheetFilePointerIsNotAvailable($sheetFilePointer);
 
         $worksheet->setFilePointer($sheetFilePointer);
 
-        fwrite($sheetFilePointer, self::SHEET_XML_FILE_HEADER);
-        fwrite($sheetFilePointer, '<sheetData>');
+        \fwrite($sheetFilePointer, self::SHEET_XML_FILE_HEADER);
+        \fwrite($sheetFilePointer, '<sheetData>');
     }
 
     /**
@@ -165,7 +165,7 @@ EOD;
 
         $rowXML .= '</row>';
 
-        $wasWriteSuccessful = fwrite($worksheet->getFilePointer(), $rowXML);
+        $wasWriteSuccessful = \fwrite($worksheet->getFilePointer(), $rowXML);
         if ($wasWriteSuccessful === false) {
             throw new IOException("Unable to write data in {$worksheet->getFilePath()}");
         }
@@ -227,7 +227,7 @@ EOD;
                 $cellXML = '';
             }
         } else {
-            throw new InvalidArgumentException('Trying to add a value with an unsupported type: ' . gettype($cell->getValue()));
+            throw new InvalidArgumentException('Trying to add a value with an unsupported type: ' . \gettype($cell->getValue()));
         }
 
         return $cellXML;
@@ -263,12 +263,12 @@ EOD;
     {
         $worksheetFilePointer = $worksheet->getFilePointer();
 
-        if (!is_resource($worksheetFilePointer)) {
+        if (!\is_resource($worksheetFilePointer)) {
             return;
         }
 
-        fwrite($worksheetFilePointer, '</sheetData>');
-        fwrite($worksheetFilePointer, '</worksheet>');
-        fclose($worksheetFilePointer);
+        \fwrite($worksheetFilePointer, '</sheetData>');
+        \fwrite($worksheetFilePointer, '</worksheet>');
+        \fclose($worksheetFilePointer);
     }
 }