Beta
PHP function array_udiff_uassoc() has 4 arguments:

&arr1 required
&arr2 required
&callback_data_comp_func required
&callback_key_comp_func required

Full syntax: array_udiff_uassoc(&arr1, &arr2, &callback_data_comp_func, &callback_key_comp_func)

See PHP documentation: http://php.net/array_udiff_uassoc

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