create multimentional array in php
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Solution:
The problem is this line:
$new_array[$i] = $title;
This is setting the initial elements of$new_array to strings, not an array. So when you later do
$new_array[$first_key][] = $title;
it's trying to doarray_push on a string.
That line should be:
$new_array[$i] = array($title);
Answer
Solution:
Add this statement before the one that triggers the error:
if (!isset($new_array[$first_key])) $new_array[$first_key] = array();
This way you ensure that$new_array[$first_key] is initialised as an array and you can safely add elements to that array.
But your algorithm will still fail, as you use that same array $new_array in your preg_grep call. That will not work as you want when you have added sub-arrays to $new_array.
You need to two variables: one for doing the preg_grep, which you do not change, and one where you add to in your loop. Currently you are mixing these two...
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