- array_splice: documentation ( source)
- array_chunk: documentation ( source)
- array_merge: documentation ( source)
- var_export: documentation ( source)
<?php
$arr = array (
'relation' => 'AND',
'key1' => 'Demo',
'value1' => 'demo',
'compare1' => '=',
'type1' => 'NUMERIC',
'key2' => 'test',
'value2' => 'test',
'compare2' => '=',
'type2' => 'NUMERIC',
);
$new = array_merge(array_splice($arr, 0,1), array_chunk($arr, 4, true));
var_export($new);