$num = "123" ; if (! filter_var ( $num , FILTER_VALIDATE_INT)) echo ( "Hello" ); else echo ( " Welcome to GeeksforGeeks " ); ?> Parameters: No output is returned Hello Welcome to GeeksforGeeks error Output:Welcome to GeeksforGeeks
Explanation:filter_var() - Filters one variable with the specified filter.question 2 $var = 300; $int_options = array ( "options" = > array ( "min_range" = > 0, "max_range" = > 256)); if (! filter_var ( $var , FILTER_VALIDATE_INT, $int_options )) echo ( "Hello" ); else echo ( " Welcome to GeeksforGeeks " ); ?> Parameters: No output is returned Hello Welcome to GeeksforGeeks error Output:Hello
Explanation:Since the integer is "300", it is not in the specified range, and the output of the above code will look like "The integer is not valid." Question 3 $string = "Welcomeêê to GeêêeksfoøørGeêêeks" ; $string = filter_var ( $string , FILTER_SANITIZE_EMAIL); echo $string ; ?> Parameters: Welcome to GeêêeksfoøørGeêêeks Welcome to GeeeeksfooorGeeeeks Welcome to GeêeksfoørGeêeks WelcometoGeeksforGeeks Output: WelcometoGeeksforGeeks
Explanation:Sanitize - this is nothing more than removing invalid characters or special characters, so invalid characters such as ê and ø and space will be removed.Question 4 $value = ’GeeksforGeeks’ ; $result = filter_var ( $value , FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE); ?> Parameters: FALSE TRUE No Output ERROR Output:No Output Explanation:There is an undocumented filter flag for FILTER_VALIDATE_BOOLEAN. The documentation implies that it will return NULL if the value is not true / false. However, this will not happen unless you give it the FILTER_NULL_ON_FAILURE flag. Therefore, the result will be No Output.Question 5 function GeeksforGeeks ( $string ) { return str_replace ( "_" , "" , $string ); } $string = " I_am_intern_at_GeeksforGeeks! " ; echo filter_var ( $string , FILTER_CALLBACK, array ( "options" = > "GeeksforGeeks" )); ?> Parameters: I_am_intern_at_GeeksforGeeks! IaminternatGeeksforGeeks! I’m an intern at GeeksforGeeks! error Output: I am intern at GeeksforGeeks!
Explanation:The above code converts all "_" characters to spaces. Call the filter_var() function with the FILTER_CALLBACK filter and an array containing our function.Question 6 $num = ’123 + abc-xyz *’ ; $num = filter_var ( $num , FILTER_SANITIZE_NUMBER_INT); echo $num?> Parameters: 123 + ABC-XYZ * abcxyz * 123 + - error Exit: 123 + -
Explanation:filter_var() - with FILTER_SANITIZE_NUMBER_INT, remove all characters except numbers, + - and if necessary.Question 7 $num = ’123 + -abc *’ ; $res = filter_var ( $num , FILTER_SANITIZE_NUMBER_FLOAT); echo $res?> Parameters: 123 + ABC-XYZ * abcxyz * 123 + - error Exit: 123 + -
Explanation:filter_var() - with FILTER_SANITIZE_NUMBER_FLOAT, remove all characters except numbers, + - and if necessary.
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