Tools, FAQ, Tutorials:
Verifying If a Key Exists in an Array in PHP
How Do You Know If a Key Is Defined in an Array in PHP?
✍: FYIcenter.com
There are two functions can be used to test if a key is defined in an array or not:
Here is a PHP example script:
<?php $array = array("Zero"=>"PHP", "One"=>"Perl", "Two"=>"Java"); print("Is 'One' defined? ".array_key_exists("One", $array)."\n"); print("Is '1' defined? ".array_key_exists("1", $array)."\n"); print("Is 'Two' defined? ".isset($array["Two"])."\n"); print("Is '2' defined? ".isset($array[2])."\n"); ?>
This script will print:
Is 'One' defined? 1 Is '1' defined? Is 'Two' defined? 1 Is '2' defined?
⇒ Finding a Given Value in an Array in PHP
⇐ Counting the Number of Values in an Array in PHP
2017-01-29, 1409👍, 0💬
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