Functions used to determine whether the PHP array is null: count, size, and empty

PHP's preferred method for determining empty arrays & mdash; count ($ arr) and size ($ arr): $ arrarray (& quot ;); echocount ($ arr); echosize ($ arr); // output 1 $ arrarray (); echocount ($ arr); ec

PHP preferred method for determining null array -- count ($ arr) and size ($ arr ):

$ Arr = array (""); echo count ($ arr); echo size ($ arr); // output 1 $ arr = array (); echo count ($ arr); echo size ($ arr); // output 0

PHP method 2 -- empty ($ arr ):

$ Arr = array (""); $ result = empty ($ arr); // $ result = false $ arr = array (); $ result = empty ($ arr ); // $ result = true

These two methods can be used to determine whether a simple array or multi-dimensional array is null. In general, empty () is used to determine whether the array is not empty. This makes the code easier to understand.