基本数组引用PHP

如何解决基本数组引用PHP

如何引用以下动态数组的元素？

$log = array();

$arr1 = array ('a'=>'6:16pm','b'=>2,'c'=>3,'d'=>4,'e'=>5); 
$arr2 = array ('a'=>'6:24pm','b'=>20,'c'=>30,'d'=>40,'e'=>50); 

$log = array_merge($log,array($arr1['a']=>$arr1));
$log = array_merge($log,array($arr2['a']=>$arr2)); //<-- to use time as key

print_r($log);

    for ($x = 0; $x < count($log); $x++) {
        print_r ($log[0][$x]['a']);  // <-- referencing issue Undefined offset: 0 .. line 20
    }

//------ produces

Array
(
    [6:16pm] => Array
        (
            [a] => 6:16pm
            [b] => 2
            [c] => 3
            [d] => 4
            [e] => 5
        )

    [6:24pm] => Array
        (
            [a] => 6:24pm
            [b] => 20
            [c] => 30
            [d] => 40
            [e] => 50
        )

)

我很确定它与我命名$ log主数组的方式有关..可能有一种更好的方法来实现我的愿望（..时间键）-不幸的是，仍然是php noob。感谢您的指导。

解决方法

如果您不知道密钥，建议您使用foreach语句：

$logs = array();

$arr1 = array ('a'=>'6:16pm','b'=>2,'c'=>3,'d'=>4,'e'=>5); 
$arr2 = array ('a'=>'6:24pm','b'=>20,'c'=>30,'d'=>40,'e'=>50); 

$logs = array_merge($logs,array($arr1['a']=>$arr1));
$logs = array_merge($logs,array($arr2['a']=>$arr2)); //<-- to use time as key

$logs = array();

$arr1 = array('a' => '6:16pm','b' => 2,'c' => 3,'d' => 4,'e' => 5);
$arr2 = array('a' => '6:24pm','b' => 20,'c' => 30,'d' => 40,'e' => 50);

$logs = array_merge($logs,array($arr1['a'] => $arr1));
$logs = array_merge($logs,array($arr2['a'] => $arr2)); //<-- to use time as key


foreach ($logs as $time => $log) {

    //index: 
    print_r($time);
    //array: 
    print_r($log);
    // a array key:
    print_r($log['a']);

    //go through all keys:
    foreach ($log as $letter => $value) {
        //index: 
        print_r($letter);
        //value: a
        print_r($value);
    }
}

,

这还不清楚，但是只需从两者创建一个数组并使用a索引：

$log = array($arr1,$arr2);

foreach($log as $values) {
    echo $values['a'];  // 6:16pm
}

或者如果您希望时间作为索引，则在a上重新索引：

$log = array($arr1,$arr2);
$log = array_column($log,null,'a');

foreach($log as $time => $values) {
    echo $time;         // 6:16pm
    echo $values['b'];  // 2
}

它很漂亮，但是没有时间作为索引，除非您要使用ksort或按索引访问：

echo $log['6:16pm']['b'];

,

您不能像这样调用数组

print_r ($log[0]); 

因为您的阵列具有键。第一个是6:16pm，第二个是6:24pm。您必须通过分配的键名来调用它。您的数组即使在循环中的任何地方都应该这样调用

print_r ($log["6:16pm"]);