PHP Array_merge involving $_SESSION doesn't work

Question

This code doesn't seem to work:

session_start();
$_SESSION['filtros_web_jobs'] = array();
array_merge( $_SESSION['filtros_web_jobs'], $_POST['filtros_web_form'] );
var_dump($_SESSION);
var_dump($_POST);
session_write_close();
exit;

Outputs:

array(1) {
  ["filtros_web_jobs"]=>
  array(0) {
  }
}
array(1) {
  ["filtros_web_form"]=>
  array(1) {
    ["cola"]=>
    string(18) "fisica_Renova_zxcv"
  }
}

Any clue?

Thanks

Because $_SESSION['filtros_web_jobs'] might have other values that I am not putting here so the code remains clean. — JorgeeFG
– JorgeeFG, Commented Sep 10, 2013 at 15:34
correct usage of array_merge would help $x=array_merge($y, $z); php.net/manual/en/function.array-merge.php — Waygood
– Waygood, Commented Sep 10, 2013 at 15:34

Ryan M · Accepted Answer · 2013-09-10 15:34:11Z

4

Array_merge returns an array. It does not mutate the arrays that are passed to it.

$merged = array_merge( $_SESSION['filtros_web_jobs'], $_POST['filtros_web_form'] );

answered Sep 10, 2013 at 15:34

Ryan M

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Andrew Hall · Accepted Answer · 2013-09-10 15:34:24Z

2

From Array merge on PHP.net

Return Values

Returns the resulting array.

You aren't setting the output to anything - Try this:

$output = array_merge( $_SESSION['filtros_web_jobs'], $_POST['filtros_web_form'] );
print_r($output);

answered Sep 10, 2013 at 15:34

Andrew Hall

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Jite · Accepted Answer · 2013-09-10 15:34:31Z

1

array_merge returns the new, merged array. Try:

$a = array_merge( $_SESSION['filtros_web_jobs'], $_POST['filtros_web_form'] );
var_dump($a);

answered Sep 10, 2013 at 15:34

Jite

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Shivdhwaj Pandey · Accepted Answer · 2014-12-01 12:23:13Z

0

You have not cached the data that array_merge function is giving you after merging the arrays.

 $mergedArray = array_merge( $_SESSION['filtros_web_jobs'], $_POST['filtros_web_form'] );

answered Dec 1, 2014 at 12:23

Shivdhwaj Pandey

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