PHP. Loop through an array and get items with attributes in common

Question

How can I loop through this array and get arrays with only similar values. In the example below, I would like to have an array that contains items 2, 3 and 4 because they all have category_parent => 4 in common.

I need to loop through that array so that I get the following result.

<ul>
  <li>0</li>
  <li>1
    <ul>
      <li>2</li>
      <li>3</li>
      <li>4</li>
    </ul>
  </li>
  <li>5</li>
</ul>

Array
(
    [0] => stdClass Object
        (
            [term_id] => 3
            [name] => Comercial
            [slug] => comercial
            [term_group] => 0
            [term_taxonomy_id] => 3
            [taxonomy] => category
            [description] => 
            [parent] => 0
            [count] => 1
            [cat_ID] => 3
            [category_count] => 1
            [category_description] => 
            [cat_name] => Comercial
            [category_nicename] => comercial
            [category_parent] => 0
        )

    [1] => stdClass Object
        (
            [term_id] => 4
            [name] => Escolar
            [slug] => escolar
            [term_group] => 0
            [term_taxonomy_id] => 4
            [taxonomy] => category
            [description] => 
            [parent] => 0
            [count] => 0
            [cat_ID] => 4
            [category_count] => 0
            [category_description] => 
            [cat_name] => Escolar
            [category_nicename] => escolar
            [category_parent] => 0
        )

    [2] => stdClass Object
        (
            [term_id] => 5
            [name] => Kinder
            [slug] => kinder
            [term_group] => 0
            [term_taxonomy_id] => 5
            [taxonomy] => category
            [description] => 
            [parent] => 4
            [count] => 1
            [cat_ID] => 5
            [category_count] => 1
            [category_description] => 
            [cat_name] => Kinder
            [category_nicename] => kinder
            [category_parent] => 4
        )

    [3] => stdClass Object
        (
            [term_id] => 6
            [name] => Primaria
            [slug] => primaria
            [term_group] => 0
            [term_taxonomy_id] => 6
            [taxonomy] => category
            [description] => 
            [parent] => 4
            [count] => 1
            [cat_ID] => 6
            [category_count] => 1
            [category_description] => 
            [cat_name] => Primaria
            [category_nicename] => primaria
            [category_parent] => 4
        )

    [4] => stdClass Object
        (
            [term_id] => 7
            [name] => Secundaria
            [slug] => secundaria
            [term_group] => 0
            [term_taxonomy_id] => 7
            [taxonomy] => category
            [description] => 
            [parent] => 4
            [count] => 2
            [cat_ID] => 7
            [category_count] => 2
            [category_description] => 
            [cat_name] => Secundaria
            [category_nicename] => secundaria
            [category_parent] => 4
        )

    [5] => stdClass Object
        (
            [term_id] => 1
            [name] => Uncategorized
            [slug] => uncategorized
            [term_group] => 0
            [term_taxonomy_id] => 1
            [taxonomy] => category
            [description] => 
            [parent] => 0
            [count] => 1
            [cat_ID] => 1
            [category_count] => 1
            [category_description] => 
            [cat_name] => Uncategorized
            [category_nicename] => uncategorized
            [category_parent] => 0
        )

)

What do you mean by "similar values"? Which values? How "close" do the values have to be to each other to be "similar"? — user554546
– user554546, Commented Feb 9, 2012 at 23:51
The example is array items 2, 3 and 4 because they all have same category_parent => 4 — leonel
– leonel, Commented Feb 9, 2012 at 23:55
Okay, so loop through the array and only pick out those subarrays with category_parent==4. — user554546
– user554546, Commented Feb 9, 2012 at 23:57
If you want something different, you're going to have to coherently explain what you want to do rather than give one example and hope that we're mind readers (Hint: we're not) and can divine what you actually want to do. — user554546
– user554546, Commented Feb 10, 2012 at 0:07
The problem is, I have to create HTML lists on the fly. so <ul><li>2</li><li>3</li><li>4</li></ul> — leonel
– leonel, Commented Feb 10, 2012 at 0:08

Alec Gorge · Accepted Answer · 2012-02-09 23:53:20Z

1

Use array_filter

$filtered = array_filter($original, function ($class) {
    return $class->category_parent === 4;
});

answered Feb 9, 2012 at 23:53

Alec Gorge

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Comments

Muhammad Abrar · Accepted Answer · 2012-02-09 23:50:58Z

0

Stored in a new array.

$result = array();

foreach ($array as $element) {
    if($element->category_parent == 4) {
        $result[] = $element;
    }
}

print_r($result);

answered Feb 9, 2012 at 23:50

Muhammad Abrar

2,3221 gold badge15 silver badges14 bronze badges

3 Comments

Alex Over a year ago

He needs to check the multidimensional array for common values, not if value == x

user554546 Over a year ago

@w0rldart - OP is either unable or unwilling to elaborate on what he means other than he wants all of the subarrays with the category_parent value to equal 4.

Muhammad Abrar Over a year ago

I'm answering his specific need to filter the category_parent :)

chechopeefe · Accepted Answer · 2012-02-09 23:52:13Z

0

foreach ($array as $key => $element){
  if ($element->category_parent == 4)
    $ret[] = $key;
}
//$ret is the final array

answered Feb 9, 2012 at 23:52

chechopeefe

1789 bronze badges

1 Comment

chechopeefe Over a year ago

sorry that saves the indexes not the items. if you want to save the items, Muhammad Abrar's answer will do

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