Can't access elements in array using key

Question

I'm trying to get a list of all pages on a wordpress site and access their ID. I can get a list of pages using the get_pages() function. When I try to access any of the elements with their keys, it doesn't interpret.

For example, the following code wouldn't work:

$pages = get_pages();

foreach ($pages as $page) {
  $ID = $page['ID'];
}

But, if I do this:

$pages = get_pages();

foreach($pages as $page) {
  foreach ($page as $key => $value) {
    echo("<p>$key</p>");
  }
}

It clearly prints out ID as a valid key.

What am I doing wrong?

Please provide the error message, and a var_dump or pages. — Jonnix
– Jonnix, Commented Aug 8, 2017 at 9:06
See the manual The returned array is an array of "page" objects The manual is always a good place to look when things go wrong. So $ID = $page->ID; is probably what you want — RiggsFolly
– RiggsFolly, Commented Aug 8, 2017 at 9:12

Moiz Shafqat Husain · Accepted Answer · 2017-08-08 09:07:40Z

3

When you do this

$pages = get_pages();

foreach($pages as $page) {
  foreach ($page as $key => $value) {
    echo("<p>$key</p>");
  }
}

So the above $pages becomes associated array, and you can access key with associative array. Associated arrays are used in php for KEY VALUE PAIR

So you can use

$pages = get_pages(); 
  foreach ( $pages as $page ) {
  echo  $page->ID;

}

answered Aug 8, 2017 at 9:07

Moiz Shafqat Husain

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5 Comments

Alex Over a year ago

Thank you, works perfectly. When I create my own array by declaring my own keys for elements I can access it with the normal array syntax. How is that different to this example?

Moiz Shafqat Husain Over a year ago

I dint got you... elaborate more please

RiggsFolly Over a year ago

See @Pawan Kumar answer.

Alex Over a year ago

@RiggsFolly Thank you.

Moiz Shafqat Husain Over a year ago

Thanks for accpeting my solution. I hope it helped everyone in this case.

RiggsFolly · Accepted Answer · 2017-08-08 09:20:06Z

3

Because get_pages() returns an array of "pages" OBJECTS $page in the foreach loop will be a page object therefore you need to use the -> to address the ID property.

$pages = get_pages(); 
foreach ( $pages as $page ) {
    echo  $page->ID;
}

edited Aug 8, 2017 at 9:20

RiggsFolly

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answered Aug 8, 2017 at 9:07

Pawan Thakur

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4 Comments

RiggsFolly Over a year ago

Do or Do Not, there is no "Try" padawan. A good answers will always have an explanation of what was done and why it was done that way, not only for the OP but for future visitors to SO that may find this question and be reading your answer.

Pawan Thakur Over a year ago

Ok . Thanks @RiggsFolly.

Pawan Thakur Over a year ago

Now it is better. Thank you again. @RiggsFolly.

Alex Over a year ago

Thank you. I thought that it was returning an array of arrays, not objects. Dumb mistake.

Alexandru · Accepted Answer · 2017-08-08 09:22:27Z

-1

Give an example of the array(multidimensional,key->value,simple array,etc). Let's assume:

//simple array parsing
$pages = array('one','two','three');
foreach ($pages  as $page) {
  echo "Current value: $page.\n";
}

//key-> value parsing
$pages   = array(
"one" => 1,
"two" => 2,
"three" => 3
);

foreach ($pages as $k => $v) {
  echo "\$pages[$k] => $v.\n";
}

 //multidimensional array parsing
 $pages = array();
 $pages[0][0] = "one";
 $pages[0][1] = "two";
 $pages[1][0] = "three";

 foreach ($pages as $v1) {
    foreach ($v1 as $v2) {
       echo "$v2\n";
    }
 }

See references on [link]http://php.net/manual/en/control-structures.foreach.php

answered Aug 8, 2017 at 9:22

Alexandru

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1 Comment

Alex Over a year ago

Thank you for the answer. I got the whole situation wrong though, the array actually contained objects, not arrays.

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