What are some potential issues with pushing multiple arrays using foreach loops in PHP for JavaScript usage?

One potential issue with pushing multiple arrays using foreach loops in PHP for JavaScript usage is that the resulting JavaScript array might not be structured as intended, with nested arrays instead of a flat array. To solve this, you can use the array_merge function in PHP to merge the arrays before encoding them to JSON. 

$combinedArray = [];
$arrays = [$array1, $array2, $array3]; // Assuming $array1, $array2, $array3 are the arrays to be combined

foreach ($arrays as $array) {
    $combinedArray = array_merge($combinedArray, $array);
}

echo json_encode($combinedArray);

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