array_flip以逗号分隔的格式打印重复值 [英] array_flip to print duplicate values in comma separated format

问题描述

我正在尝试使用array_flip以逗号分隔的格式打印重复的值

$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");
$flip=array_flip($a);
print_r($flip);

我的输出是:

Array ( [red] => a [green] => b [blue] => d )

但是我的预期输出是:

Array ( [red] => a [green] => b [blue] => c,d)

如何获得该输出?

解决方案

您需要像

$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");
$flip=array_flip($a);
print_r($flip);

一样使函数与array_flip一起使用

$array = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");

$res = array_flip($array);

foreach ($res as $k => $v)
    $res[$k] = implode(", ", array_keys($array, $k));
print_r($res);

输出:

Array
(
    [red] => a
    [green] => b
    [blue] => c, d
)

演示

I'm trying to use array_flip to print duplicate values in a comma separated format

$a=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");
$flip=array_flip($a);
print_r($flip);

My output is:

Array ( [red] => a [green] => b [blue] => d )

But my intended output is:

Array ( [red] => a [green] => b [blue] => c,d)

How can I get that output?

解决方案

You need to make your function along with array_flip like as

$array = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");

$res = array_flip($array);

foreach ($res as $k => $v)
    $res[$k] = implode(", ", array_keys($array, $k));
print_r($res);

Output :

Array
(
    [red] => a
    [green] => b
    [blue] => c, d
)

Demo

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