Excel file creation failure in laravel | Learning Curve- Perfect Tutorial for the beginers

PHPExcel_Calculation_Exception in Cell.php line 293,Formula Error:am unexpected error occured

Error Scenario: This error usually throws because of special characters.if that characters are reserved words in the excel formula calculation. i got this error in one of my application.excel files created using large set of data. In this one of the field start with symbol (=) equal to.This time download option is not working

Solution: i tried and searched the solutions for this.i made it as the character replacement.if the first charcter is =,then append one more reliable character(i used ~) at the begining

For example

<?php
#value='======->checking the blog';

$first_char = substr($value, 0, 1); 
$newval=$first_char == '=' ? '~'.$value : $value;
?>

<?php

#value='======->checking the blog';

$first_char = substr($value, 0, 1);

$newval=$first_char == '=' ? '~'.$value : $value;

we can use the $newval in the excel creation