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PHP Arrays plus symbol (+) syntax

http://www.php.net/manual/en/language.operators.array.php

With the $array1 + $array2 syntax, anything with a text key in $array1 is kept, at the expense of anything with the same key in $array2.

<?php
    $form_context
= array(
     
'entity_type' => $form['#entity_type'],
     
'bundle' => $form['#bundle'],
     
// Although we are partially generalized with the above options, in
      // truth we do not know that other forms follow the same structure as
      // node forms, so we will use 'nid' until doing general case for real.
     
'nid' => $form['nid']['#value'],
    );

// ...

     

$context = array(
       
'callback' => $formmsg['callback'],
      ) +
$form_context;
?>

We don't have to worry about 'callback', or anything else that gets defined in $context, getting overridden by $form_context.

Searched words: 
php array plus syntax array addition PHP arrays += operators array union

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