通过循环检查数组项的值

Question

while ($row = $checkUser->fetch_assoc()) {
        $arr = $row['username'];
}

像这样检查只是不起作用

if($arr !="john"){

}else{

}

如何检查$ row ['username']是否包含字符串“john”？

Answer 1

假设你正确得到这个$row['username']。然后

$arr = array();

while ($row = $checkUser->fetch_assoc()) {
        $arr[] = $row['username'];
}

if(in_array("john",$arr)){
    //there is a username john in the array
}else{
    //this is no john inside the array
}