douxianwu2221 2013-09-19 13:11
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在foreach php中只获取一次重复的数组值

My array has 12 news items with titles, descriptions and category name

I have only 4 categories ( 3 items each) and need to create categories menu but if I get them from items array I have 12 category names(3x each) as a result. How can I echo category names only once if it was already printed ?

$myarray print:

   [0] => Array
        (
            [title] => Item 1
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 1
        )

    [1] => Array
        (
            [title] => Item 1
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 2
        )
    [2] => Array
        (
            [title] => Item 2
            [desc] => Sed venenatis bibendum nisl, eget iaculi
            [cat_title] => Category 2
        )...

loop:

   foreach( $myarray as $key=>$item){

       echo $item['category_name'];
    }

Note: I am not able to know how many categories wil the re be , it can be one or more. Currently there is 4. Any help is appreciated . Thank you!

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  • dongwei7048 2013-09-19 13:17
    关注

    Map the array categories to a simple array and then remove all duplicate values.

    $categories = array_unique(array_map(function($val) {
        return $val['cat_title'];
    }, $myarray));
    
    foreach($categories as $cat) {
        echo $cat;
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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