php is set used to determine that a variable is set or not. The isset() function is an inbuilt function in PHP which checks whether a variable is set and is not NULL.
php is set – isset() and !empty() function in PHP
check whether a variable is set or not in PHP – Use the PHP isset() function
PHP isset() function syntax
isset(“variable”);
PHP isset() – Check If Variable Is Set
Use the PHP isset() function
"; $str2 = 'Welcome TO Pakainfo.com!'; if(isset($str2)){ echo 'This slogen is displayed, because the $str2 is set.'; } echo "
"; // Unset the striable unset($str2); if(isset($str2)){ echo 'This slogen is displayed, because the $str2 is set.'; } else{ echo 'This slogen is displayed, because the $str2 is not set.'; } echo "
"; $str3 = NULL; if(isset($str3)){ echo 'This slogen is displayed, because the $str3 is set.'; } else{ echo 'This slogen is displayed, because the $str3 is not set.'; } ?>
PHP isset() Example
//The output is : boolean true
Checking if a Cookie is Set
Use the PHP isset() function upon the superglobal $_COOKIE variable to check if a cookie is set.
Example:
if (isset($_COOKIE['member'])) { echo 'Member is ' . $_COOKIE['member']; else { echo 'Member is not sign in'; } // PHP 7.0+ echo 'Member is ' . $_COOKIE['member'] ?? 'Member is not sign in';
I hope you get an idea about php is set.
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