Fix PHP Excel for PHP v7.4

DefaultValueBinder.php

<?php

// ...
// Location: /phpoffice/phpexcel/Classes/PHPExcel/Cell/DefaultValueBinder.php

/**
 * DataType for value
 *
 * @param   mixed  $pValue
 * @return  string
 */
public static function dataTypeForValue($pValue = null)
{
    // Match the value against a few data types
    if ($pValue === null) {
        return PHPExcel_Cell_DataType::TYPE_NULL;
    } elseif ($pValue === '') {
        return PHPExcel_Cell_DataType::TYPE_STRING;
    } elseif ($pValue instanceof PHPExcel_RichText) {
        return PHPExcel_Cell_DataType::TYPE_INLINE;
    } elseif (is_string($pValue) && $pValue[0] === '=' && strlen($pValue) > 1) {
        return PHPExcel_Cell_DataType::TYPE_FORMULA;
    } elseif (is_bool($pValue)) {
        return PHPExcel_Cell_DataType::TYPE_BOOL;
    } elseif (is_float($pValue) || is_int($pValue)) {
        return PHPExcel_Cell_DataType::TYPE_NUMERIC;
    } elseif (preg_match('/^[\+\-]?([0-9]+\\.?[0-9]*|[0-9]*\\.?[0-9]+)([Ee][\-\+]?[0-2]?\d{1,3})?$/', $pValue)) {
        $tValue = ltrim($pValue, '+-');
        if (is_string($pValue) && $tValue[0] === '0' && strlen($tValue) > 1 && $tValue[1] !== '.') {
            return PHPExcel_Cell_DataType::TYPE_STRING;
        } elseif ((strpos($pValue, '.') === false) && ($pValue > PHP_INT_MAX)) {
            return PHPExcel_Cell_DataType::TYPE_STRING;
        }
        return PHPExcel_Cell_DataType::TYPE_NUMERIC;
    } elseif (is_string($pValue) && array_key_exists($pValue, PHPExcel_Cell_DataType::getErrorCodes())) {
        return PHPExcel_Cell_DataType::TYPE_ERROR;
    }

    return PHPExcel_Cell_DataType::TYPE_STRING;
}