您正在将字符串与数组进行比较。你应该像这样使用in_array
<select class="form-control" id="space" name="space">
<option value="--Select--">--Select--</option>
<?PHP
$select=MysqLi_query($con,"select * from clients where Space IS NOT NULL");
while($menu1=MysqLi_fetch_array($select))
{
$filled =$menu1['Space'];
$valuez = array("C101","C102","C103","C104");
foreach($valuez as $value){
if($value != $filled){
?>
<option value="<?PHP echo $value;?>">
<?PHP echo $value;?>
</option>
<?PHP
}
}
}
?>
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