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    Function Parameters in PHP: A Comprehensive Guide

    Rumman Ansari July 18, 2024 5,864 views
    Function Parameters in PHP: A Comprehensive Guide

    Function parameters are declared after the function name and inside parentheses. They are declared much like a typical variable would be -

    Syntax: 

    

<?php
   // multiply a value by 5 and return it to the caller
   function multiply ($value) {
      $value = $value * 5;
      return $value;
   }
   
   $retval = multiply (10);
   Print "Return value is $retval\n";
?>

    Output:

    This will produce the following result 

    

Return value is 50
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    MCQ Section

    MCQ 1
    Which one of the following PHP functions can be used to build a function that accepts any number of arguments?
    MCQ 2
    Which one of the following PHP functions can be used to find files?
    MCQ 3
    The filesize() function returns the file size in ___.
    MCQ 4
    Which one of the following PHP function is used to determine a file
    MCQ 5
    Which one of the following function is capable of reading a file into a string variable?
    MCQ 6
    Which one of the following function is capable of reading a specific number of characters form a file?
    MCQ 7
    Which one of the following function operates similarly to fgets(), except that it also strips any HTML and PHP tags form the input?
    MCQ 8
    Which one of the following function outputs the contents of a string variable to the specified resource?
    MCQ 9
    Which function sets the file filename
    MCQ 10
    Which function is useful when you want to output the executed command
    MCQ 11
    Which one of the following function reads a directory into an Array?
    MCQ 12
    Which one of the following is the right way of defining a function in PHP?
    MCQ 13
    Type Hinting was introduced in which version of PHP?
    MCQ 14
    Which of the following PHP functions can be used to get the current memory usage?
    MCQ 15
    Which of the following PHP functions can be used for generating unique id
    MCQ 16
    Which one of the following functions can be used to compress a string?
    MCQ 17
    What will be the output of the following PHP code? 
    < ?php 
echo "chr(52)";
?>
    MCQ 18
    What will be the output of the following PHP code? 
    < ?php 
    echo ord ("hi");
?>
    MCQ 19
    What will be the output of the following PHP code? 
    < ?php 
    $str = "Hello World"
    echo wordwrap($str,5,"
\n");    
?>
    MCQ 20
    What will be the output of the following PHP code? 
    < ?php 
    echo ucwords("i love my country");
?>
    MCQ 21
    What will be the output of the following PHP code? 
    < ?php 
    echo lcfirst("welcome to India");
?>
    MCQ 22
    What will happen in this function call? 
    < ?php 
    function calc($price,$tax)	
    {
        $total = $price + $tax;
    }
    $pricetag = 15;
    $taxtag = 3;
    calc($pricetag, $taxtag);	
?>
    MCQ 23
    What will be the output of the following PHP code? 
    < ?php 
    function calc($price, $tax="")
    {
        $total = $price + ($price * $tax);
        echo "$total"; 
    }
    calc(42);	
?>
    MCQ 24
    Which of the following are valid function names?
    i) function()
    ii) €()
    iii) .function()
    iv) $function()
    MCQ 25
    What will be the output of the following PHP code? 
    < ?php 
    function a()
    {
        function b()
        {
            echo 'I am b';
 	}
        echo 'I am a';
    }
    a();
    a();
?>
    MCQ 26
    What will be the output of the following PHP code? 
    < ?php 
    function a()  
    {
        function b()
        {
            echo 'I am b';
 	}
        echo 'I am a';
    }
    b();
    a();
?>
    MCQ 27
    What will be the output of the following PHP code? 
    < ?php 
    $op2 = "blabla";
    function foo($op1)
    {
        echo $op1;
        echo $op2;
    }
    foo("hello");
?>
    MCQ 28
    A function in PHP which starts with __ (double underscore) is know as.
    MCQ 29
    What will be the output of the following PHP code? 
    < ?php 
    function foo($msg)
    {
        echo "$msg";
    }
    $var1 = "foo";
    $var1("will this work");
?>