PHP QUIZ: All Mathematical Functions

Posted on April 3, 2018 by Chris Larham [Site Administrator] — Leave a comment

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:

Example of the mobile layout — An example of the layout designed for mobile phones

Example of the tablet layout — An example of the layout designed for tablets

Example of the desktop layout — An example of the layout designed for desktop computers

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.

FUNCTION NAME	FUNCTION DESCRIPTION	FUNCTION SYNTAX	FUNCTION RETURN VALUE
`abs()` [Absolute value]	Returns the positive value of a number. Example: `echo abs(-5.3);` would output 5.3.	`abs(number);`	If number is a float then the return type is a float. Otherwise the return type is an integer.
`acos()` [Arc cosine]	Returns the arc cosine of a number.	`acos(number);`	Returns the arc cosine of number, provided that number is in the range -1 to 1. Otherwise it returns NAN.
`acosh()` [Inverse hyperbolic cosine]	Returns the inverse hyperbolic cosine of a number.	`acosh(number);`	Returns the inverse hyperbolic cosine of number, videlicet – the number whose hyperbolic cosine is number.
`asin()` [Arc sine]	Returns the arc sine of a number.	`asin(number);`	Returns the arc sine of number, provided that number is in the range -1 to 1. Otherwise it returns NAN.
`asinh()` [Inverse hyperbolic sine]	Returns the inverse hyperbolic sine of a number.	`asinh(number);`	Returns the inverse hyperbolic sine of number. Return type: float.
`atan()` [Arc tangent]	Returns the arc tangent of a number in radians.	`atan(number);`	Returns the arc tangent of number as a numeric value between -Pi/2 and Pi/2 radians. Return type: float.
`atan2()` [Arc tangent of two variables]	Returns the arc tangent of two numbers – x and y. [Arc tangent of two variables]	`atan2(y, x);` [y specifies the dividend, x specifies the divisor.]	Returns the arc tangent of y/x in radians, which is a float between -Pi and Pi.
`atanh()` [Inverse hyperbolic tangent]	Returns the inverse hyperbolic tangent of a number.	`atanh(number);`	Returns the inverse hyperbolic tangent of number. Return type: float.
`base_convert()` [Convert a number between arbitrary bases]	Converts a number from one number base to another number base. Digits in numbers with a base higher than 10 will be represented by the letters a – z, with a meaning 10, b meaning 11 … and z meaning 35.	`base_convert(number, frombase, tobase);` [Both frombase and tobase have to be between 2 and 36, inclusive.]	Returns a string containing number represented in base tobase.
`bindec()` [Binary to decimal]	Converts a binary number to a decimal number.	`bindec(binary_string);` [The parameter value must be a string.]	Returns the decimal value of binary_string, as a float/integer.
`ceil()` [Round fractions up]	Rounds a number up to the nearest integer.	`ceil(number);`	Returns number rounded up to the nearest integer. Return type: float.
`cos()` [Cosine]	Returns the cosine of a number.	`cos(number);`	Returns the cosine of number as a float in the range -1 to 1.
`cosh()` [Hyperbolic cosine]	Returns the hyperbolic cosine of a number. This is equivalent to `(exp(number) + exp(- number))/2.`	`cosh(number);`	Returns the hyperbolic cosine of number as a float.
`decbin()` [Decimal to binary]	Converts a decimal number to a binary number.	`decbin(number);`	Returns a string that represents the binary value of number.
`dechex()` [Decimal to hexadecimal]	Converts a decimal number to a hexadecimal number.	`dechex(number);`	Returns a string that represents the hexadecimal value of number.
`decoct()` [Decimal to octal]	Converts a decimal number to an octal number.	`decoct(number);`	Returns a string that represents the octal value of number.
`deg2rad()` [Converts the number in degrees to the radian equivalent]	Converts a degree value to a radian value.	`deg2rad(number);`	Returns a float representing number converted to radians.
`exp()` [Converts the exponent of ‘e’]	Returns e [the base of the natural system of logarithms, approximately 2.718282] raised to the power of x (e^x).	`exp(x);` [x specifies the exponent].	Returns a float representing e raised to the power of x.
`expm1()` *[Returns `exp(number) - 1`, computed in a way that is accurate even when the value of number* is close to zero]**	Returns a number that is one less than `exp(x)`.	`expm1(x);`	Returns a float representing a number that is one less than e raised to the power of x.
`floor()` [Round fractions down]	Rounds a number down to the nearest integer.	`floor(number);`	Returns a float that represents number rounded down to the nearest integer.
`fmod()` *[Returns the floating point remainder (modulo) of the division of the arguments]*	Returns the remainder [‘modulo’] of x divided by y.	`fmod(x, y);` [x specifies the dividend, y specifies the divisor.]	Returns a float that represents the remainder of x divided by y.
`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(xx + yy)`.	`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.
`lcg_value()` [Combined linear congruential generator]	Returns a pseudo random number between 0 and 1. The number generated is not cryptographically secure; `random_int()`, `random_bytes()`, or `openssl_random_pseudo_bytes()` should be used for cryptographic purposes.	`lcg_value();`	Returns a pseudo random float in the range 0 – 1.
`log10()` [Base-10 logarithm]	Returns the base-10 logarithm of number.	`log10(number);`	Returns the float representation of the base-10 logarithm of number.
`log1p()` *[Returns `log(1 + number)`, computed in such a way that is accurate even when the value of number* is close to zero]**	Returns *log(1 + number)* computed in a way that is accurate even when number is close to zero. `log()` might only return `log(1)` in this case due to lack of precision.	`log1p(number);`	Float representation of the result of `log1p(number)`.
`log()` [Natural logarithm]	If the optional base parameter is specified, `log()` returns `log_base(number)`; otherwise, the natural logarithm of number is returned.	`log(number, base);` *[number* –** the value to calculate the logarithm for base – the optional logarithmic base to use (defaults to ‘e’ and thus to the ‘natural logarithm’)]	Float return type, representing the logarithm of number to base, if given, or the natural logarithm.
`max()` [Finds the highest value]	Returns the numerically highest value from the parameters provided to the function. If the only parameter is an array, the highest value is returned; otherwise, the biggest of the parameter values is returned.	`max(array_values);` OR `max(value1, value2, ...);`	Returns the numerically highest value passed to the function. If multiple values of different types evaluate as equal, the first parameter provided to the function will be returned. If an empty array is passed, FALSE will be returned and an E_WARNING error will be emitted.
`min()` [Finds the lowest value]	Returns the parameter value considered lowest according to standard comparisons. If the only parameter is an array, the lowest value is returned; otherwise, the lowest of the parameter values is returned.	`min(array_values);` OR `min(value1, value2, ...);`	Returns the numerically lowest value passed to the function. If multiple values of different types evaluate as equal, the first parameter provided to the function will be returned. If an empty array is passed, FALSE will be returned and an E_WARNING error will be emitted.
`mt_getrandmax()` [Shows the largest possible random number]	Returns the maximum value that can be returned from a call to `mt_rand()` without arguments, which is the maximum value that can be used for its max parameter without the result being scaled up.	`mt_getrandmax();`	Returns an integer representation of the maximum number that can be returned by a call to `rand()`.
`mt_rand()` *[Generates a random number via the Mersenne Twister Random Number Generator]*	If called without the optional min and max arguments a pseudo random number between 0 and `mt_getrandmax()` is returned. Otherwise, a random number between min and max [inclusive] is returned. As with `lcg_value()`, the number generated is not cryptographically secure; `random_int()`, `random_bytes()`, or `openssl_random_pseudo_bytes()` should be used for cryptographic purposes.	`mt_rand();` OR `mt_rand(min, max);`	Returns a random integer between min (or 0) and max (or `mt_getrandmax()`, inclusive), or FALSE if max is less than min.
`mt_srand()` *[Seeds the Mersenne Twister Random Number Generator]*	`mt_srand`: Seeds the random number generator with seed (if specified), or with a random value if no seed is given.	`mt_srand(seed [optional], mode [optional]);` [seed specifies an arbitrary integer seed value; mode specifies the implementation of the algorithm to use]	No value is returned for `mt_srand()`.
`octdec()` [Octal to decimal]	Returns the decimal equivalent of the octal number represented by the octal_string argument.	`octdec(octal_string);`	If the decimal equivalent of the octal_string argument can be represented by the platform’s integer type then an integer is returned; otherwise, a float representation is returned.
`pi()` [Gets the value of ‘pi’]	Returns an approximation of pi, which has a default precision of 14 (can be altered in the `php.ini` file). Using the `M_PI` constant yields identical results to `pi()`.	`pi();`	Returns a float representation of `pi`.
`pow()` [Exponential expression]	Returns `x` raised to the power of `y`. All input – even non-scalar values – will be converted to a number, which could produce unexpected results.	`pow(x, y);` [`x` specifies the ‘base’ to use; `y` specifies the ‘exponent’.]	Returns `x` raised to the power of `y`. If both `x` and `y` are non-negative integers and the result can be represented as an integer, an integer type is returned; otherwise, a float type is returned.
`rad2deg()` [Converts the radian number to the equivalent number in degrees]	This function converts number from radian to degrees.	`rad2deg(number);`	Returns a float representation of number converted to degrees.
`rand()` [Generates a random integer]	If called without the min, max arguments `rand()` returns a pseudo-random integer between 0 and `getrandmax()`. `rand(5, 15)` returns a number between 0 and 15 [inclusive], for example. As with `lcg_value()`, the number generated is not cryptographically secure; `random_int()`, `random_bytes()`, or `openssl_random_pseudo_bytes()` should be used for cryptographic purposes.	`rand();` OR `rand(min, max);`	Returns a pseudo random integer between `min` (or 0) and `max` (or `getrandmax()`), inclusive.
`round()` [Rounds a float]	Returns the rounded value of `number` to the specified `precision` [number of digits after the decimal point: default is zero; can also be negative].	`round(number, precision[optional], mode[optional]);` Mode values: `PHP_ROUND_HALF_UP PHP_ROUND_HALF_DOWN PHP_ROUND_HALF_EVEN PHP_ROUND_HALF_ODD`	Returns the rounded `number` as a float.
`sin()` [Sine]	Returns the sine of `number` [this parameter is in radians].	`sin(number);`	Returns the sine of number as a float.
`sinh()` [Hyperbolic sine]	Returns the hyperbolic sine of `number`, defined as `(exp(number) - exp(-number))/2`.	`sinh(number);`	Returns the hyperbolic sine of `number` as a float.
`sqrt()` [Square root]	Returns the square root of `number`.	`sqrt(number);`	Returns the float representation of the square root of `number`, or the special value `NAN` for negative numbers.
`srand()` [Seeds the random number generator]	Seeds the random number generator with `seed` or with a random value if no `seed` is given.	`srand(seed[optional]);`	No value is returned for `srand()`.
`tan()` [Tangent]	Returns the tangent of number [this parameter is in radians].	`tan(number);`	Returns the tangent of `number` as a float.
`tanh()` [Hyperbolic tangent]	Returns the hyperbolic tangent of number, defined as `sinh(number)/cosh(number)`.	`tanh(number);`	Returns the hyperbolic tangent of `number` as a float.

About Chris Larham [Site Administrator]

Forty-year-old father of three wonderful children [William, Seth, and Alyssa]. Works as an Assistant Technical Officer in the Sterile Services Department of Treliske Hospital, Cornwall. Enjoys jogging, web design, learning programming languages, and supporting Arsenal FC. Obtained a BA degree in English from the University of Bolton in 2008, and has continued to gain qualifications in a diverse range of subjects thereafter.

Tagged with: PHP Maths Quiz, PHP Maths Reference Table, php.net, Pre-certification quiz, w3schools.com
Posted in PHP Maths Quizzes

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PHP QUIZ: All Mathematical Functions

HOW THE QUIZ WORKS:

VIEWPORT OPTIONS:

PURPOSE:

USAGE:

FILL IN FORM AND CLICK SUBMIT TO ADD YOUR STATISTICS TO THE LEADERBOARD:

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PHP QUIZ: All Mathematical Functions

HOW THE QUIZ WORKS:

VIEWPORT OPTIONS:

PURPOSE:

USAGE:

FILL IN FORM AND CLICK SUBMIT TO ADD YOUR STATISTICS TO THE LEADERBOARD:

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Like this: