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工作正常但在第二个数组中搜索时它无法正常工作。

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;
    }   
}
?>

Not FoundAli。 12月份出生

另外，如果您可以解释嵌套foreach循环的工作原理。

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;
}   
?>

在PHP中使用foreach循环的迭代多维关联数组

1 个答案: