php - Warning: Division by zero . First time when I see this error -


this question has answer here:

hello have in unknow error : 

warning: division 0 in /home/inv/public_html/items.php on line 71 warning: division 0 in /home/inv/public_html/items.php on line 84

please me because first time when see error , i'm beginner in .php . apreciate.

line 71 84

						<span class="selector-chance">'.round(100*$sumvalue/$bank,1).'</span> %  						<span class="tooltip-content2 clearfix">  							<span class="tooltip-text2">  								Шанс выигрыша с этими предметами  								<a href="about.php">Читать подробнее</a>  							</span>  						</span>  					</h4>  				</div>  		</article>  		</section>';  		$td .= '<div class="players-percent-block" style="margin: 10px 6px;">  				<img src="'.$avatar.'">  				<div class="players-percent-text" style="font: 700 19px "robotoregular";">'.round(100*$sumvalue/$bank,1).'%</div>

thank guys !

it seems value of $bank variable zero.


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