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PHP Math functions - Exercises, Practice, Solution

PHP Math functions [ 12 exercises with solution]

1. Write a PHP script to find the maximum and minimum marks from the following set of arrays. Go to the editor
Sample arrays :
$marks1 = array(360,310,310,330,313,375,456,111,256);
$marks2 = array(350,340,356,330,321);
$marks3 = array(630,340,570,635,434,255,298);
Expected Output :
Maximum marks : 635
Minimum marks : 111
Click me to see the solution

2. Write a PHP script which rounds the following values with 1 decimal digit precision. Go to the editor
Sample values and Output :
1.65 --> 1.7
1.65 --> 1.6
-1.54 --> -1.5
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3. Write a PHP script to generate random 11 characters string of letters and numbers. Go to the editor
Click me to see the solution

4. Write a PHP script to convert scientific notation to an int and a float. Go to the editor
Sample scientific notation : 4.5e3
Expected Output : 4 & 4500
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5. Write a PHP script to convert a date from yyyy-mm-dd to dd-mm-yyyy. Go to the editor
Sample floating value : 0.0456
Expected Output :
Exponent part : -4
Mantissa part : 0.7296
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6. Write a PHP script to get the information regarding memory usage in KB or MB etc. Go to the editor
Click me to see the solution

7. Find earliest and latest dates from a list of dates. Go to the editor
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8. Write a PHP function to round a float away from zero to a specified number of decimal places. Go to the editor
Sample Data :
(78.78001, 2)
(8.131001, 2)
(0.586001, 4)
(-.125481, 3)
-.125481
Sample Output :
78.79
8.14
0.5861
-0.126
-1
Click me to see the solution

9. Write a PHP function to convert Arabic Numbers to Roman Numerals. Go to the editor
Click me to see the solution

10. Write a PHP function to get random float numbers. Go to the editor
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11. Write a PHP function to create a human-readable random string for a captcha. Go to the editor
Sample Output :
hoboh
tynzh
Click me to see the solution

12. Write a PHP function to get the distance between two points on the earth. Go to the editor
Click me to see the solution

PHP Code Editor:

More to Come !

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



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PHP: Tips of the Day

PHP: How to get a variable name as a string in PHP?

You could use get_defined_vars() to find the name of a variable that has the same value as the one you're trying to find the name of. Obviously this will not always work, since different variables often have the same values, but it's the only way I can think of to do this.

Edit: get_defined_vars() doesn't seem to be working correctly, it returns 'var' because $var is used in the function itself. $GLOBALS seems to work so I've changed it to that.

function print_var_name($var) {
    foreach($GLOBALS as $var_name => $value) {
        if ($value === $var) {
            return $var_name;
        }
    }

    return false;
}

Edit: to be clear, there is no good way to do this in PHP, which is probably because you shouldn't have to do it. There are probably better ways of doing what you're trying to do.

Ref : https://bit.ly/37qFimU