从foreach循环中删除重复项

Question

I'm trying to loop through a custom post type and display all meta values for a meta key.

I'm able to display all the values, however there are some duplicates. I want to remove those duplicates.

I have tried using array_unique without luck.

My code:

<?php
query_posts(array(
'post_type' => 'lejlighed'

 ));
 ?>
               <?php
while (have_posts()):
the_post();


$meta = get_post_meta($post->ID, 'antal_varelser');

foreach ($meta as $m) {

    echo '<option value="1">' . $m . '</option>';

}
endwhile;
?> 

The result: 2 2 3 4 3 3 4

My code with array_unique:

<?php
$the_query = new WP_Query(array(
'post_type' => 'lejlighed',
 ));
 ?>
 <?php

 while ($the_query->have_posts()):
 $the_query->the_post();
 $meta = get_post_meta($post->ID, 'antal_varelser');
 $result = array_unique($meta);

 foreach($result as $r)
 {
 echo '<option value="1">' . $m . '</option>';
 }

 endwhile; ?>

Outputs nothing.

print_r($meta) returns:

Array ( [0] => 2 ) Array ( [0] => 12 ) Array ( [0] => 4 ) Array ( [0] => 2 ) Array ( [0] => 5 ) Array ( [0] => 2 ) Array ( [0] => 4 ) Array ( [0] => 4 ) Array ( [0] => 3 ) Array ( [0] => 3 ) 

Any suggestions?

Answer 1

You could try to use a loop and fill another array first with:

bool in_array ( $needle , array $haystack)

Then you should have only unique values in the new array, which can be used for ur loop

---

Edit:

For me two ways are working...

We assume this array is given:

$org = array('1', '2', '2', '3', '3', '4', '5', '6');

Simple array_unique:

// simple array unique call with sort by string
$new = array_unique($org, SORT_STRING);

// output the sorted array
var_dump($new);

Sort array in loop by using in_array:

// sort with in_array()
for ($i=0; $i < count($org); $i++) {

    if (!in_array($org[$i], $new)) {
        $new[] = $org[$i];
    }
}

// output the sorted array
var_dump($new);

Live Demo