php 如何获取数组中的特定值
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How can I get specific value in array
提问by Gowri
I will explain clearly
我会解释清楚
$array = array("1" => array(0 =>"aa",1 =>"bb", 2 => "cc",3=>"dd"),
"2" => array(0 =>"aa1",1 =>"bb1", 2 => "cc1",3=>"dd1"));
In this two dimension are
在这两个维度中
$array2[$a][$b];
I know $a value and $b is unknown
我知道 $a 值而 $b 未知
If I using $a =1, I want to filter array(0 =>"aa",1 =>"bb", 2 => "cc",3=>"dd")this array
如果我使用$a =1，我想过滤array(0 =>"aa",1 =>"bb", 2 => "cc",3=>"dd")这个数组
But I need to get the second array element. Any function is available to do that?
但我需要获取第二个数组元素。任何功能都可以做到这一点？
回答by shamittomar
This is how you do it:
这是你如何做到的：
$a = array(1=>'a', 2=>'b', 3=>'c');
//display the value with key 2:
echo $a[2];
//remove the value with key 2 (throw-out / bring-out in your language)
unset($a[2]);
//now display whole array to show that value with key 2 is gone
print_r($a);
This outputs:
这输出：
b
乙
And then it outputs:
然后它输出：
Array ( [1] => a [3] => c )
数组 ( [1] => a [3] => c )
回答by stalin wesley
make new array you want to sperate specific elements that key
制作新的数组，以分散关键的特定元素
$newarr = array(2,5,8);
foreach($arr1 as v1){
foreach($arr2 as $k => $v2 ){
if (in_array($k,$newarr))
{
// process ...
}
}
}
