如何在PHP中打印带有键和值的数组元素?
我正在学习php中的数组和循环。但无法打印包含键和值的数组。我该怎么做如何在PHP中打印带有键和值的数组元素?,php,arrays,loops,output,Php,Arrays,Loops,Output,我正在学习php中的数组和循环。但无法打印包含键和值的数组。我该怎么做 <?php $marks = array ( "Alice" => array ( "physics" => "60", "math" => "65" ), "Bob" => array ( "physics" => "40", "math" => "45" ) ); foreach (
<?php
$marks = array (
"Alice" => array (
"physics" => "60",
"math" => "65"
),
"Bob" => array (
"physics" => "40",
"math" => "45"
)
);
foreach ( $marks as $key => $value) {
foreach ( $key as $key2 => $value2 ) {
echo $key . " : " . $key2 . " - " . $value2 . "<br>";
};
};
?>
在嵌套数组中,必须迭代保存数组的$value
foreach ( $marks as $key => $value) {
foreach ( $value as $key2 => $value2 ) {
// -------^^^^^^-------
echo $key . " : " . $key2 . " - " . $value2 . "<br>";
}
};
在嵌套数组中,必须迭代保存数组的$value
foreach ( $marks as $key => $value) {
foreach ( $value as $key2 => $value2 ) {
// -------^^^^^^-------
echo $key . " : " . $key2 . " - " . $value2 . "<br>";
}
};
用这个
foreach ( $marks as $key => $value) {
foreach ( $value as $key2 => $value2 ) {
echo $key . " : " . $key2 . " - " . $value2 . "<br>";
}
}
用这个
foreach ( $marks as $key => $value) {
foreach ( $value as $key2 => $value2 ) {
echo $key . " : " . $key2 . " - " . $value2 . "<br>";
}
}
通过这种方式,可以更容易地修复它并消除混淆:
$marks = array(
'Alice' => array(
'physics' => 60,
'math' => 65,
),
'Bob' => array(
'physics' => 40,
'math' => 45,
),
);
// Loop students
foreach($marks as $name => $grades){
// Loop their grades
foreach ($grades as $subject => $score){
echo $name . ' : ' . $subject . ' - ' . $score . '<br>';
}
}
请注意,数字没有引号。这将允许您使用它们作为数字进行进一步的计算。这样可以更易于阅读,以修复它并消除混淆:
$marks = array(
'Alice' => array(
'physics' => 60,
'math' => 65,
),
'Bob' => array(
'physics' => 40,
'math' => 45,
),
);
// Loop students
foreach($marks as $name => $grades){
// Loop their grades
foreach ($grades as $subject => $score){
echo $name . ' : ' . $subject . ' - ' . $score . '<br>';
}
}
请注意,数字没有引号。这将允许您使用它们作为数字进行进一步的计算。第二个forEach应该类似于forEach$value as$key2=>$value2{第二个forEach应该类似于forEach$value as$key2=>$value2{工作正常,我想要的。非常感谢。@NahidHasan:很高兴helped@NahidHasan-欢迎来到Stackoverflow。如果这个答案解决了您的问题,请。工作正确,这是我想要的。非常感谢。@NahidHasan:很高兴helped@NahidHasan-欢迎来到Stackoverflow。如果这个答案解决了您的问题,请。真的吗ble名称使代码更具可读性。谢谢:不客气。在尝试制定解决方案时命名和注释代码/脚本非常有帮助。实际上,这些变量名称使代码更具可读性。谢谢:不客气。在尝试制定解决方案时命名和注释代码/脚本非常有帮助。