本文介绍了从关联数组的数组中获取一个属性的唯一值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个像这样的数组:
I have an array like this:
$a = array( 0 => array('type' => 'bar', 'image' => 'a.jpg'), 1 => array('type' => 'food', 'image' => 'b.jpg'), 2 => array('type' => 'bar', 'image' => 'c.jpg'), 3 => array('type' => 'default', 'image' => 'd.jpg'), 4 => array('type' => 'food', 'image' => 'e.jpg'), 5 => array('type' => 'food', 'image' => 'f.jpg'), 6 => array('type' => 'food', 'image' => 'h.jpg') )如何找出唯一的类型值(即食品,条形图和默认值)?我可以在foreach循环中遍历数组,但是有更好的方法吗?
How do I figure out unique type values (which would be food, bar and default)? I could iterate through the array in a foreach loop but is there a better way doing it?
推荐答案在PHP> = 5.3中,使用匿名函数:
In PHP >= 5.3 with the use of anonymous functions:
$unique_types = array_unique(array_map(function($elem){return $elem['type'];}, $a));对于以前的版本,您可以声明一个单独的函数:
For previous versions you can declare a separate function:
function get_type($elem) { return $elem['type']; } $unique_types = array_unique(array_map("get_type", $a));更多推荐
从关联数组的数组中获取一个属性的唯一值
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