为什么我的if语句没有按照我期望的方式工作？

Question

I am trying to achieve the following: I ask my SQL database a query using SELECT * FROM subjects. After doing that I ask for the array using mysqli_fetch_assoc. Until that point all is fine. The problem now is that when I try to modify in each loop the value of $genero depending if it's 1 or 0. But the value of $genero never changes, it's always 1 and I am sure that the array is fetching 0 and 1. Any idea while the values of $genero are not changing through the loop?

while ($subject = mysqli_fetch_assoc($result)) {
if ($subject["sexo"] = 1) { 
    $genero = "<img src='images/hombre.png' />";
} else {
    $genero = "<img src='images/mujer.png' />";
}
    echo $genero;
}

Answer 1

Your comparison operator is wrong. You're using = which is an assignment operator. In your example it will always be true. You need to use == which is a comparison operator.

if ($subject["sexo"] = 1) { 

should be

if ($subject["sexo"] == 1) {