Php associated array to determine whether it is null

Source: Internet
Author: User
Tags php tutorial


<? Php Tutorial
$ Array = array (0 );
If (empty ($ array )){
Echo "I am empty ";
} Else {
Echo "I am not empty ";
    }
$ Array ['array'] = 'I am an array ';
Print_r ($ array );
$ Array ['ray1'] = 'I am array 1 ';
Print_r ($ array );
Unset ($ array ['array1']);
Print_r ($ array );
?>


PHP preferred method for determining null array: count ($ arr), 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 for null array determination: 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.

 

Related Article

E-Commerce Solutions

Leverage the same tools powering the Alibaba Ecosystem

Learn more >

Apsara Conference 2019

The Rise of Data Intelligence, September 25th - 27th, Hangzhou, China

Learn more >

Alibaba Cloud Free Trial

Learn and experience the power of Alibaba Cloud with a free trial worth $300-1200 USD

Learn more >

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.