PHP exactly determines if it is a directory array

PHP accurately determines if an array is indexed

function Is_assoc ($arr) {    return Array_keys ($arr)!== range (0, COUNT ($arr)-1);//Array_values ($arr)!== $arr} function Is_assoc2 ($array) {  return (BOOL) count (Array_filter (Array_keys ($array), ' is_string '));} $array = Array (0=> "1",1=> "3"); Var_dump ($array); Echo Is_assoc ($array)? ' Indexed array ': ' is not an indexed array '; Echo '
"; Echo is_assoc2 ($array)?" Indexed array ': ' is not an indexed array '; Echo '
"; $array = Array (" 0 "=" 1 "," 1 "=" 3 "); Var_dump ($array); Echo Is_assoc ($array)? ' Indexed array ': ' is not an indexed array '; Echo '
"; Echo is_assoc2 ($array)?" Indexed array ': ' is not an indexed array '; Echo '
"; $array = Array (" name "=" 1 "," Age "=" 3 "); Var_dump ($array); Echo Is_assoc ($array)? ' Indexed array ': ' is not an indexed array '; Echo '
"; Echo is_assoc2 ($array)?" Indexed array ': ' is not an indexed array ';

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Array (size=2)  0 = string ' 1 ' (length=1)  1 = = String ' 3 ' (length=1) not an indexed array is not an indexed array (size=2)  0 = s Tring ' 1 ' (length=1)  1 = String ' 3 ' (length=1) not an indexed array is not an indexed array (size=2)  ' name ' = = String ' 1 ' (length=1) 
   ' age ' = = String ' 3 ' (length=1) index array of indexed arrays

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