如何在数据库的多维数组中显示值，同时保持值的唯一性

您还可以使用一个中间存储数组来存储您已经打印的值，并对其进行查询，以确保您只打印唯一的数组值。

<?php
$darray = array
(
    array ( 0 => 'apple', 1 => 'pear', 2 => 'appetiser' ),
    array ( 0 => 'apple', 1 => 'pear', 2 => 'appetiser' ),
    array ( 0 => 'indian', 1 => 'vegetarian', 2 => 'entree' ),
    array ( 0 => 'german', 1 => 'snack', 2 => 'vegetarian' ) ,
    array ( 0 => 'mexican', 1 => 'soup', 2 => 'pear' ),
    array ( 0 => 'apple', 1 => 'snack' ),
    array ( 0 => 'italian', 1 => 'entree', 2 => 'pear', 3 => 'vegetarian' )
);
$printedArray = array();
foreach($darray as $darr)
{
    foreach($darr as $val)
    {
        if(!in_array($val,$printedArray))
        {
            echo $val."<br>"; 
            //you could alternately store the value into an array[] here
            //and print it later...
            array_push($printedArray,$val);
        }   
    }
}
?>

这应该打印：

apple
pear
appetiser
indian
vegetarian
entree
german
snack
mexican
soup
italian

循环遍历多维数组，收集值并使用array_unique（）提取唯一值：

<?php
$darray = array
(
    array('apple', 'pear', 'appetiser'),
    array('apple', 'pear', 'appetiser'),
    array('indian', 'vegetarian', 'entree',),
    array('german', 'snack', 'vegetarian') ,
    array('mexican', 'soup', 'pear'),
    array('apple', 'snack'),
    array('italian', 'entree', 'pear', 'vegetarian'),
);
$array = array();
foreach ($darray as $monodimensional_array)
{
    foreach ($monodimensional_array as $value)
    {
        $array[] = $value;
    }
}
$array = array_unique($array);