Php judges the code of an empty array program

Empty function, which determines that the array value is null

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

Implode ();

Use implode () to output the array as a string and determine whether the output string is null. It seems to be a good method at the beginning, but unfortunately it keeps up with 1.1. It won't work for arrays above two dimensions. For example:

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$ Arr = array (), array (), array ()); $ Str = implode (',', $ arr ); If (empty ($ str) echo "null "; Else echo "not empty ";

Array_filter function

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<? Php $ Str1_array = array ('yunqi Community Network ', '', 'http: // www.111cn.net','', '123 ',''); $ Str1_array = array_filter ($ str1_array ); Print_r ($ str1_array ); ?> Result Array ( [0] => Yunqi Community Network Http://www.111cn.net [4] = & gt; 1654 )

Count, size () function

These two functions are the method code used to judge an empty array.

$ Arr = array ("");
Echo count ($ arr );
Echo size ($ arr );
// Output 1