PHP Basic Function Example Detailed

This article is mainly to share with you the PHP basic function Examples of the detailed, I hope to help everyone.

1, the function of the output:

L print (): Similar to what the Echo output provides, returns 1

L Print_r () is generally used for printing arrays , not printing types

L Var_dump (): The value of the printed data, as well as the type

2. Functions related to TIME

L Date (): Display datetime

Example: Date ("Y-m-dh:i:s")

L Time (): Timestamp (number of seconds)

L microtime (): Returns the timestamp and the number of microseconds

L strtotime (): Parses a datetime string into a timestamp

3. Mathematical Correlation function:

L Max ($v 1, $v 2, $v 3 ...) max.

L min ($v 1, $v 2, $v 3 ...) minimum value

L rand () random number

L Mt_rand () to generate better random numbers

L round (variable [, N]) keep N bit small

L ceil () rounding up

L floor () rounding down

L POW (x, y) Seek xy

L ABS () absolute value

L sqrt (): Seek square root

4. Functions related to functions

L function_exists (' function name ') to determine if a function exists

L Func_get_arg (subscript) gets the parameter corresponding to the specified subscript

L Func_get_args (): Gets all the parameters in the custom function (the return value is an array)

L Func_num_args (): Gets the number of arguments for the current custom function

5. String-related functions

Basic function strlen (): Gets the length of the string Mb_strlen($ string variable name, character encoding)

L Implode (connection mode, array): Concatenate into a string

L explode(split character, Target string): into an array

L Str_split (string, character length): Splits a string by a specified length to get an array

Trim (string [, specified character]): The default is to remove spaces on both sides of the string

L LTrim (): Remove the Left

L RTrim (): Remove the right

L substr(string, start position starting from 0 [, length])

L strstr(string, match character): Start at the specified position, intercept to the last (can be used to go to the file suffix name)

L Strtolower (): All lowercase

L Strtoupper (): All caps

L Ucfirst (): Capitalize first letter

L Strpos (string, match character): determines where the character appears in the target string (first time)

L Strrpos (string, match character)

L Str_replace (match target, replace content, string itself)

L printf/sprintf (the output string has placeholders, order placeholder content ...) %d%s

L str_repeat (): Repeats a string n times

L str_shuffle (): Randomly scrambled string

6. Array-related functions

functions for sorting arrays

L Sort (): Sort ascending by the value of the element ( subscript reorder)

L rsort (): Descending by the value of the element ( subscript reorder)

L Asort (): Sort ascending by the value of the element (subscript reserved)

L arsort (): Descending by the value of the element (subscript reserved)

L ksort (): Array key Name (subscript) in ascending order (subscript reserved)

L krsort (): Key names in descending order, (subscript reserved)

L Shuffle (): Random scrambling of array elements, bidding clubs rearrangement under array

L Sort: The default is in ascending order, with R is descending order )

L have a: is to keep the index relationship

L k: Sort by key name

Pointer

Reset () resets the pointer and returns the array pointer to the first

L End () resets the pointer, pointing the array pointer to the last element

L next () pointer moves down to get the value of the next element

L prev () pointer moves up to get the value of the previous element

L current (): Gets the value of the element that is currently in the pointer (does not move the pointer)

L Key (): Gets the subscript value corresponding to the current pointer (does not move the pointer)

Array other functions

L count (): counts the number of elements in the array

L Array_push (): Add an element to the array (after the array)

L array_pop (): Remove an element from the array (after the array)

L array_shift (): Remove an element from the array (front of the array)

L Array_unshift (): Add an element from the array (before the array)

L array_reverse (): array elements in turn

L In_array (): Determines whether an element exists in the array

L Array_keys (): Gets all the subscripts of an array, returns an indexed array

L array_values (): Gets all the values of an array, returns an indexed array

L array_merge (): merges one or more arrays

Array_merge ($arr 1, $arr 2)

L array_splice (): Remove part of the array and replace it with other values

$input = Array ( , "green"
array_splice Span style= "color: #007700;" > ( $input , 2 );

//$input is now array(“red”,”Green”);

L array_chunk (): splits an array into multiple

L Shuffle (): disturb the array

L Range (): creates an array containing the specified range of cells

L is_file (): determine if the given file name is a normal file

L define (): defines a constant

L defined (): checks for the existence of a constant of a name

L ini_set (): set a value for a configuration optionini_set('display_errors', '1');

L basename (): returns the file name portion of the path

L Is_array (): detects if the variable is an array

L List (): assigns the values in the array to some variables

$info = array('coffee', 'brown', 'caffeine');
list($drink, $color, $power) = $info;
echo "$drink is $color and $power makes it special.\n";

L nl2br (): insert HTML wrap tag before all new lines in string

L Array_rand (): random extraction of one or more cells from an array

L count (): counts the number of cells in an array or the number of attributes in an object

L Reset (): points The inner pointer of the array to the first cell