Php empty () function details

Today I want to talk about the usage of the empty function, what is the difference between empty and other functions, and whether the normal value is returned when you use it to operate the array. If you need it, please refer to it.

 

The Code is as follows:	Copy code
<? Php $ Array1 = array (); Print_r ($ array1 ); If (empty ($ array1 )){ Echo 'for empty () is an empty array (an empty array )'; } Else { Echo 'non-empty array (an noempty array) 'For empty )'; } ?> Display result :###################### Array ( ) For empty (), it is an empty array

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The Code is as follows:	Copy code
<? Php $ Array1 = array (); $ Array1 [] = ''; Print_r ($ array1 ); If (empty ($ array1 )){ Echo 'for empty () is an empty array (an empty array )'; } Else { Echo 'non-empty array (an noempty array) 'For empty )'; } ?> Display result :###################### Array ( [0] => ) Non-empty array (an noempty array) for empty) ###############################

 

This is not an empty array because it has an element that is a null character (""). Be sure to distinguish it from a null character ("" (an empty string;

Actually
Empty ($ x) equals! Isset ($ x) |! $ X
! Empty ($ x) equals isset ($ x) & $ x

Empty function syntax

Empty -- check whether a variable is empty
Description
Bool empty (mixed var)

If var is a non-null or non-zero value, empty () returns FALSE. In other words, "", 0, "0", NULL, FALSE, array (), var $ var; and objects without any attributes will be considered empty, if var is null, TRUE is returned.