So $tr['tree'] is an array. $dic is an array stored as key values. I want to add the key source to that those arrays. It looks like the following code doesn't work as expected as I'm guessing $dic is a new instance of the array object inside $tr['tree'].
foreach($tr['tree'] as $dic){
$dic['source'] = $tr['source']." > ".$dic['name'];
}
Note, I'm coming from python where this would work brilliantly. So how would I do this in PHP?
分享 foreach() creates copies of the items you're looping on, so $dic in the loop is detached from the array. If you want to modify the parent array, the safe method is to use:
foreach($array as $key => $value) {
$array[$key] = $new_value;
}
You could use a reference:
foreach($array as &$value) {
^---
$value = $new_value;
}
but that can lead to stupidly-hard-to-find bugs later. $value will REMAIN a reference after the foreach terminates. If you re-use that variable name later on for other stuff, you'll be modifying the array, because the var still points at it.
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