HOW THE QUIZ WORKS:
Clicking the ‘randomize’ button situated above the reference table generates a new table whereby the function descriptions, function syntaxes, and function return values are randomized. The quiz involves matching the function descriptions, function syntaxes, and function return values to the correct function name. Information relating to the randomization of table cells will be displayed for three seconds, before disappearing.
On a desktop computer, table elements are selected by left-clicking the desired table cell and holding the left click in the mouse down position for one second before releasing the left click. The text inside the table cell will turn red to indicate that the one-second mouse left-click has successfully selected a table cell. To then swap the selected table cell with the target table cell, simply repeat the one-second left mouse-click process on the target cell; the table cells will swap position. To de-select a table cell, simply repeat the one-second left mouse-click process on the original table cell.
To select a table element on a touchscreen device (mobile, tablet), simply touch the desired table cell and maintain the touch for one second before removing your finger from the screen. The text inside the table cell will turn red to indicate that the one-second touch has successfully selected a table cell. To then swap the selected table cell with the target table cell, simply repeat the one-second touch process on the target cell; the table cells will swap position. To de-select a table cell, simply repeat the one-second touch process on the original table cell.
Normal touchscreen scrolling behaviour is exhibited by the cells with a light green background; cells without a light green background will not respond to normal touchscreen scrolling. The table is positioned in such a way that the user can also initiate touchscreen scrolling by swiping to the right or left of the table.
When a row consists of the correct function name, function description, function syntax, and function return value, the background colour of the row will change from ‘transparent’ to ‘khaki’; this provides visual feedback that the row is complete.
Once the entire table is complete, a paragraph of feedback will congratulate the user and provide the following information: date and time of quiz commencement; date and time of quiz completion; and the length of time it took the user to complete the quiz.
VIEWPORT OPTIONS:
PURPOSE:
This webpage serves two purposes:
- It provides a reference table for the PHP mathematical functions, with information extracted and condensed from w3schools.com and php.net.
- It enables users to complete a quiz related to the PHP mathematical functions.
USAGE:
For each mathematical function there are four table cells of information: the function name; the function description; the function syntax; and the function return value. There are three layouts available – ‘mobile‘, ‘tablet‘, and ‘desktop‘.
Click the relevant button below to display the PHP mathematical functions reference table, sized appropriately for the desired viewport. A ‘RANDOMIZE‘ button appears above the reference table once the viewport is selected; clicking this button facilitates the commencement of a quiz.
Click the ‘RANDOMIZE‘ button to randomize the functional descriptions, the functional syntaxes, and the functional return information.
| FUNCTION NAME | FUNCTION DESCRIPTION | FUNCTION SYNTAX | FUNCTION RETURN VALUE |
|---|---|---|---|
getrandmax()
[Shows largest possible random number] |
Returns the largest number that can be returned by rand(), videlicet 32767 [on Windows]. Specifying min and max allows a range larger than 32767 to be created; using mt_rand() to this end should also be considered. |
getrandmax(); |
Returns an integer that represents the largest possible value that can be returned by a call to rand() (i.e. 32767 on Windows). |
hexdec()
[Hexadecimal to decimal] |
Converts a hexadecimal number to a decimal number. | hexdec(number); |
If the hexadecimal-to-decimal converted number can be represented by the platform’s integer type then an integer is returned; otherwise, a float is returned. |
hypot()
[Calculates the length of the hypoteneuse of a right-angled triangle] |
Calculates the length of the hypoteneuse of a right-angled triangle. This function is equivalent to sqrt(x*x + y*y). |
hypot(x, y); |
Returns a float representing the length of the hypoteneuse of a right-angled triangle. |
intdiv()
[Integer division] |
Returns the integer quotient of the division of the dividend by the divisor. | intdiv(dividend, divisor); |
Returns the integer quotient of dividend ÷ divisor. |
is_finite()
[Finds whether a value is a legal finite number] |
Checks whether a value is a legal finite number within the allowed range for a PHP float on this system. | is_finite(value); |
Boolean return value – true if the value is a legal, finite number within the permitted range for a PHP float on this system; false otherwise. |
is_infinite()
[Finds whether a value is infinite] |
Checks whether a value is infinite. A value is considered infinite if it is outside the allowed range for a float on this platform. | is_infinite(value); |
Boolean return value – true if the value is considered infinite [not within the permitted range for a PHP float on this system]; false otherwise. |
is_nan()
[Finds whether a value is ‘not a number’] |
Checks whether a value is not a number. | is_nan(value); |
Boolean return value – true if the value is considered not a number; false otherwise. |