<td><?php echo $img1; ?></td>
<td><?php echo $img2; ?></td>
<td><?php echo $img3; ?></td>
<td><?php echo $img4; ?></td>
<td><?php echo $img5; ?></td>

<?php
$value = 10000 //this value is obtained by SQL
$bar1 = 2600 //is the value of the first bar, obtained by SQL
$bar2 = 9950 //is the value of the second bar, obtained by SQL
$bar3 = 13010 //same as before
$bar4 = 17500 //same as before
$bar5 = 19500 //same as before

if($value > 0) && ($value < $bar1) {
$percent = ($value / $bar1) *100;
$bar1 = '<img src="progress.png" width="'.$percent.'" />';
}

if($value >= $bar1) {
$percent = '100';
$bar1 = '<img src="reached.png" width="'.$percent.'" />';
?>

<?php
if($value > $bar2) && ($value < bar3) {
$percent = ($value / $bar3) *100;
$bar3 = '<img src="progress.png" width="'.$percent.'" />';
}
>?