Question

How to validate an Integer variable with filter in PHP

Answer 1

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
  
$n = 13;

if (!filter_var($n, FILTER_VALIDATE_INT) === false) 
    echo("Integer is valid");
else 
    echo("Integer is not valid");


      
/*
run:
  
Integer is valid 

*/

 

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Answer 2

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
  
$n = 3.14;
 
if (!filter_var($n, FILTER_VALIDATE_INT) === false) 
    echo("Integer is valid");
else
    echo("Integer is not valid");
 
       
/*
run:
   
Integer is not valid  
 
*/

 

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Answer 3

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
  
$n = 0;
 
if (!filter_var($n, FILTER_VALIDATE_INT) === false) 
    echo("Integer is valid");
else
    echo("Integer is not valid");
 
       
/*
run:
   
Integer is not valid 
 
*/

 

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Answer 4

/*
mixed filter_var ( mixed $variable [, int $filter = FILTER_DEFAULT [, mixed $options ]] )
*/
  
$n = 0;
 
if (filter_var($n, FILTER_VALIDATE_INT) === 0) 
    echo("Integer is valid");
else
    echo("Integer is not valid");
 
       
/*
run:
   
Integer is valid  
 
*/

 

70+ SQL courses for beginners and professionals