If the default value of a two-dimensional array is null, how to judge whether it is null? if code is not executed

{Code ...}

$ Pet = array (["name"] => array ('','', '') [" age "] => array ('','', ''); if ($ pet) {echo $ pet} the specific code above is output only when the array has a value. I use if to identify failure.

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$ Pet = array (["name"] => array ('','', '') [" age "] => array ('','', ''); if ($ pet) {echo $ pet} the specific code above is output only when the array has a value. I use if to identify failure.

$ Pet = array ("name" => array ('','', '')," age "=> array ('','','')); foreach ($ pet as $ pKey => $ pVal) {$ pet [$ pKey] = array_filter ($ pVal) ;}$ pet = array_filter ($ pet); if (! Empty ($ pet) {var_dump ($ pet );}

Is the main question true?

1. code error,

Name and age are two-dimensional array keys separated by commas. $ Pet = array (["name"] => array ('','', ''), [" age "] => array ('','', ''); if ($ pet) {echo $ pet}

2. when you say "an array has a value, it is output", which is $ pet, name, or age.

Array_filter filters out empty arrays.