php中使用foreach循环的迭代多维关联数组

Question

我想在多维关联数组中搜索特定记录。当我从第一个数组中搜索记录时，它可以正常工作，但在第二个数组中进行搜索时，它不能正常工作。

这是我的代码：

<?php
$year= array("January"=>array("Ben","Katty","Paul"),
"December"=>array("Ali","Adnan","Sajjad")
);
$match="Ali";
$notThere = True;
foreach ($year as $month => $person) {
    foreach ($person as $subjectName => $ID) {
        if($match==$ID){        
            echo "${ID}. borns on ${month}<br>";
            $notThere = false;
        }
    }
    if($notThere){
        echo "Not Found";
        $notThere=false;
    }   
}
?>

不是FoundAli。出生于12月

此外，如果您能解释嵌套的foreach循环是如何工作的。

Answer 1

您需要将If语句移出循环

<?php
$year= array("January"=>array("Ben","Katty","Paul"),
"December"=>array("Ali","Adnan","Sajjad")
);
$match="Ali";
$notThere = True;
foreach ($year as $month => $person) {
    foreach ($person as $subjectName => $ID) {
        if($match==$ID){        
            echo "${ID}. borns on ${month}<br>";
            $notThere = false;
        }
    }
}
if($notThere){
    echo "Not Found";
    $notThere=false;
}   
?>