PHP Judge empty Array program code _php tutorial

Many friends ask the PHP hollow array How to judge, below I will summarize some commonly used to judge the empty Array program code, there is a need to know the friend can enter the reference.

The empty function, which is to judge that the array value is NULL

The code is as follows	Copy Code
$arr = Array (""); $result = Empty ($arr); $result = False $arr = Array (); $result = Empty ($arr); $result = True

Implode ();

Use implode () to output the array as a string to determine if the output is empty. It seems like a good way to start at first, but as with a little bit more than two-dimensional arrays. As an example:

The code is as follows	Copy Code
$arr = Array (array (), array (), array ()); $str = Implode (', ', $arr); if (empty ($STR)) echo "null"; else echo "non-null";

Array_filter function

The code is as follows	Copy Code
$str 1_array=array (' A network of tutorials ', ' ', ' http://www.bKjia.c0m ', ' ', ' 1654 ', '); $str 1_array=array_filter ($str 1_array); Print_r ($str 1_array); ?> Results Array ( [0] = + A-Poly tutorial net [2] = http://www.bKjia.c0m [4] = 1654 )

Count,size () function

These two functions are method codes that determine an empty array

$arr = Array ("");
echo count ($arr);
Echo size ($arr);
Output 1

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