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@ 2020-02-27T12:55:33Z

<?php

$a = array(
    array(
        0 => array(
            'one' => 1,
            'two' => 2
        ),
        1 => array(
            'three' => 1    
        )
    ),  
    array(
        0 => array(
            'one1' => 1,
            'two1' => 2
        ),
        1 => array(
            'three1' => 1    
        )
    )
);
foreach($a as $child){
    $flatten[] = array_merge(...$child);
}
print_r($flatten);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_merge: documentation ( source)

preferences:dark modelive previewkey bindings

29.51 ms | 405 KiB | 5 Q