Php in_array function with example

The in_array() function is an predefined function in PHP. The in_array() function is used to check whether a given value exists in an array or not. If the value exist in the array its return true otherwise return false.


$roll_number = array(1,2,3,4,5 ); 


if (in_array("2", $roll_number)) 


  echo "found"; 



  echo "not found"; 


Warning: Undefined variable $article_id in /var/www/html/st/includes/get_article.php on line 9

Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 6 in /var/www/html/st/includes/get_article.php:9 Stack trace: #0 /var/www/html/st/includes/get_article.php(9): mysqli_query() #1 /var/www/html/st/php/php-in-array.php(114): include('...') #2 {main} thrown in /var/www/html/st/includes/get_article.php on line 9