[PHP] function 4

// Output the PHP and current request information page

Int phpinfo (void)
// Returns the current PHP version.

String phpversion (void)
// Print out a list of people contributing to this PHP Project

String phpcredits (void)
// Convert VaR to an integer. Base is the conversion base. The default value is 10. The transformed variable VAR can be an array or a variable other than
Any Type Variable

Int intval (mixed var, int [base])
// Obtain the double precision of the Variable

Double doubleval (mixed var)
// Obtain the string value of the Variable

String strval (mixed var)
// Return the type of the Variable

String GetType (mixed var)
// Set the variable type. Returns true if the conversion is successful.

Int settype (string var, string type)
// Sort array elements

Void sort (array)
// Sort array elements in reverse order

Void rsort (array)
// Apply the User Function to each element of the array

Int array_walk (array, string func)
// Calculate the number of elements in an array

Int count (mixed var)
// Point the internal pointer of the array parameter to the last element and return this element.

Mixed end (array)
// Set the internal pointer of the array parameter to a forward element and return the element.

Mixed Prev (array)
// Point the internal pointer of the array parameter to the next element and return the element

Mixed Next (array)
// Point the internal pointer of the array parameter to 1st elements and return the element

Mixed reset (array)
// Returns the element pointed to by the internal pointer of the current array.

Mixed current (array)
// Check whether the value specified by needle exists in the haystack array. Strict means strict matching (default)

Bool in_array (mixed needle, array haystack, [, bool strict])
// Returns the index value of the next element in the array.

Array each (array)
// Add the element to the end of the array

Int array_push (array stack, mixed var [, mixed...])
// An element pops up from the end of the array.

Mixed array_pop (array stack)
// An element pops up from the beginning of the array

Mixed array_shift (array stack)
// Return the element to the beginning of the array

Mixed array_unshift (array stack)
// Returns the current UNIX timestamp.

Int time (void)
// Input the time parameter to return the Unix timestamp.

Int mktime (INT hour, int minute, int second, int month, int day, int year)
// Obtain the Greenwich Mean Time in UNIX timestamp format

Int gmmktime (INT hour, int minute, int second, int month, int day, int year)
// Format a time or date

String date (string format, int [timestamp])
// Obtain an array of date/time information

Array getdate (INT [timestamp])
// Returns true if it is a valid date.

Bool checkdate (INT month, int day, int [timestamp])
// Format the time or date expression of the server according to the region

String strftime (string format, int [timestamp])
// Convert the string representing the date and time into a timestamp. It can accept strings in most typical data formats. For example, YYYY-MM-DD
And mm/DD/YYYY

Int strtotime (string time, int now)
// Obtain the value of one second in the current time (in UNIX timestamp format. Returns a string.

String microtime (void)
// Returns the current time as an array

Array gettimeofday (void)
// Set Random Number

Void srand (INT seed)
// Return a random number. If the maximum and minimum ranges of the random number are not specified, this function automatically retrieves a random number from 0 to rand_max.
. If the min and Max parameters are specified, a number is obtained from the specified parameters.

Int rand ([int Min], [int Max])
// Returns the maximum allowed random number.

Int getrandmax (void)