如何从PHP中的数组中选择等于某个特定值的键？
问题描述：
for example if i have the following array:
$numbers=array(
"A"=>$value1,
"B"=>$value2,
"C"=>$value3,
"D"=>$value4,
"E"=>$value5,
"F"=>$value6,
"G"=>$value7,
);
and if some of the value variables are equal to 0 and the rest are equal to 1, how can I select the keys which values are equal, for example to 0?
例如，如果我有以下数组： p>
$ 号码=阵列（
“A”=＆GT; $值1，
“B”=＆GT; $值2，
“C”=＆GT; $值3，
“个d”=＆GT; $ VALUE4，
“E”=＆GT; $值5，
“F”=＆GT; $ value6，
“G”=＆GT; $ value7，
）的;
代码> PRE>
如果某些值变量等于0且其余值等于1，我如何选择值相等的键，例如0？ p>
div>
答
$result = [];
foreach($numbers as $id => $number) {
if($number ==0)
$result[$id] = $number;
}
答
Try this:
$all_zeros = array_filter($numbers);
$all_ones = array_diff($numbers, $all_zeros);
Also you might use a custom filter function like below:
function custom_filter($numbers, $targetValue) {
return array_filter($numbers, function ($i) use ($targetValue) {
return $targetValue == $i;
});
}
Ref: