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PHP Filter MCQ question and answer with solution | PHP Programming

Learn PHP Filter MCQ Questions and answers with easy and logical explanations. PHP Filter MCQ in PHP programming provides all type of technical mcq questions which is important for technical exams, cumpus exams and other entrance examination

1
Which of the following is/are an external data?
1. Cookies
2. Input data from a form
3. Server Variables
4. Web services data
Discuss
Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
2
How many types of filtering are present in PHP?
Discuss
Answer & Solution
Answer: Option B
Solution:
There are two main types of filtering: validation and sanitization.
3
Which one of the following filter is used to filter several variables with the same or different filters?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
4
What will be the output of the following PHP code? 
<?php
$num = "123";
if (!filter_var($num, FILTER_VALIDATE_INT))
    echo("Integer is not valid");
else
    echo("Integer is valid");
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
filter_var() – Filters a single variable with a specified filter.
5
Which one of the following does not describe a validating filter?
Discuss
Answer & Solution
Answer: Option A
Solution:
Option a) describes Sanitizing filters.
6
What will be the output of the following PHP code? 
<?php
$var=300;
$int_options = array("options"=>array ("min_range"=>0, "max_range"=>256));
if (!filter_var($var, FILTER_VALIDATE_INT, $int_options))
    echo("Integer is not valid");
else
    echo("Integer is valid");
?>
Discuss
Answer & Solution
Answer: Option B
Solution:
Since the integer is “300” it is not in the specified range, and the output of the code above will be: “Integer is not valid”.
7
Which one of the following filter checks if variable of specified type exists?
Discuss
Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
8
What will be the output of the following PHP code? 
<?php
$value = 'car';
$result = filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
There is an undocumented filter flag for FILTER_VALIDATE_BOOLEAN. The documentation implies that it will return NULL if the value doesn’t match the allowed true/false values. However this doesn’t happen unless you give it the FILTER_NULL_ON_FAILURE flag.
9
What will be the output of the following PHP code? 
<?php
function convertSpace($string)
{
  return str_replace("_", " ", $string);
}
$string = "Peter_is_a_great_guy!";
echo filter_var($string, FILTER_CALLBACK, array("options"=>"convertSpace"));
?>
Discuss
Answer & Solution
Answer: Option C
Solution:
The code above converts all “_” to white spaces. Call the filter_var() function with the FILTER_CALLBACK filter and an array containing our function.