Functions in PHP MCQ

func_get_argc()

glob()

bytes

The fileatime() function returns a file’s last access time in Unix timestamp format or FALSE on error.

file_get_contents()

Its prototype is string fgets(resource handle [, int length]). If the optional length parameter is omitted, 1024 character is assumed.

fgetss()

fwrite()

Its prototype is int touch(string filename [, int time [, int atime]]). It returns TRUE on success or FALSE on error.

system()

It returns an array consisting of files and directories found in directory or returns FALSE on error.

function fumctionName(parameters) { function body }

Type hinting gives you the ability to force parameters to be objects of certain class or to be arrays. PHP 5 introduced this feature.

We can use the memory_get_usage() function, and to get the highest amount of memory used at any point, we can use the memory_get_peak_usage() function.

Many people use the md5() function for this, even though it’s not exactly meant for this purpose. uniqueid() is the function that is to be used.

We will be able to achieve almost 50% size reduction using this function. The gzuncompress() function is used to uncompress the string.

The chr() function returns a character from the specified ASCII value. Since the ASCII value of 4 is 52, thus 4 was displayed.

The ord() function returns the ASCII value of the first character of a string. The ASCII value of h is 104, thus 104 was displayed.

Hello
World

The ucwords() function converts the first character of each word in a string to uppercase.

The lcfirst() function converts the first character of a string to lowercase.

When you pass an argument in the above manner or say we pass 15 and 3 directly, it is called passing by value or call by value.

You can designate certain arguments as optional by placing them at the end of the list and assigning them a default value of nothing.

Except a) others are invalid names. According to the specified regular expression ([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*), a function name like this one is valid.

This will be the output- I am a Fatal error: Cannot redeclare b()

This will be the output- Fatal error: Call to undefined function b(). You cannot call a function which is inside a function without calling the outside function.

If u want to put some variables in function that was not passed by it, you must use “global”. Inside the function type global $op2.

PHP functions that start with a double underscore – a “__” – are called magic functions in PHP. They are functions that are always defined inside classes, and are not stand-alone functions.

It is possible to call a function using a variable which stores the function name.