Use the array function in PHP to create an array _php instance

Source: Internet
Author: User

The array in PHP is actually an ordered map. A mapping is a type that associates values to the keys. This type is optimized in many ways, so you can think of it as a real array, or a list (vector), a hash list (an implementation of a map), a dictionary, a collection, a stack, a queue, and more possibilities. Because the value of an array element can also be another array, a tree structure and a multidimensional array are allowed.

Array

(PHP 4, PHP 5)

array-Create a new array

Description

Copy Code code as follows:

Array array ([mixed $ ...])

Returns an array created from a parameter. Parameters can be indexed using the => operator. For information about what the array is, read the section of the array.

Note:

Array () is a language structure that literally represents an array, not a regular function.

Syntax "Index => values", separated by commas, defines indexes and values. An index can be a string or a number. If an index is omitted, an integer index starting at 0 is automatically generated. If the index is an integer, the next resulting index will be the current largest integer index + 1. Note If two identical indexes are defined, the latter one overwrites the previous one.

Adding a comma after the last defined array item is not uncommon, but is a legitimate syntax.

The following example shows how to create a two-dimensional array, assign a key name to the corresponding array, and skip and continue the numeric index in the normal array.

Example #1 Array () example

<?php
$fruits = Array (
  "fruits" => Array ("A" => "Orange", "B" => "banana", "C" => "Apple"),
  "n Umbers "=> Array (1, 2, 3, 4, 5, 6),
  " holes "  => Array (" A ", 5 =>" second "," third ")
);
? >

Automatic indexing of Example #2 Array ()

<?php
$array = Array (1, 1, 1, 1, 1, 8 => 1, 4 => 1, 3 =>);
Print_r ($array);
? >

The above routines will output:

Array
(
[0] => 1
[1] => 1
[2] => 1
[3] => 13
[4] => 1
[8] => 1
[9] => 19
)

Note that index 3 is defined two times and retains the last value of 13. Index 4 is defined after index 8, and the next auto-generated index (with a value of 19) is 9, because the largest index is 8.

This example establishes an array starting with 1.

Example #3 Array () indexed starting at 1

<?php
$firstquarter = Array (1 => ' January ', ' February ', ' March ');
Print_r ($firstquarter);
? >

The above routines will output:

 Array
(
  [1] => January
  [2] => February
  [3] => March
)

In Perl, you can access the values of an array in double quotes. But in PHP you need to enclose the array in curly braces.

Example #4 access to an array within double quotes

<?php
$foo = Array (' Bar ' => ' Baz ');
echo "Hello {$foo [' Bar ']}!];" Hello baz!
? >

PHP Array function

PHP: Indicates the earliest version of PHP that supports this function.

function Description PHP
Array () Creates an array. 3
Array_change_key_case () Returns an array whose keys are either uppercase or lowercase. 4
Array_chunk () Divides an array into a new array block. 4
Array_combine () Creates a new array by merging two arrays. 5
Array_count_values () Used to count the occurrences of all values in an array. 4
Array_diff () Returns an array of difference sets for two arrays. 4
ARRAY_DIFF_ASSOC () Compares the key name and key values and returns an array of difference sets for two arrays. 4
Array_diff_key () Compares the key name and returns an array of difference sets for two arrays. 5
ARRAY_DIFF_UASSOC () Computes the difference set of an array by indexing the user-supplied callback function. 5
Array_diff_ukey () Compares the difference set of an array with a callback function for the key name. 5
Array_fill () Fills the array with the given value. 4
Array_filter () Filters the elements in an array with a callback function. 4
Array_flip () Swap the keys and values in the array. 4
Array_intersect () Computes the intersection of an array. 4
ARRAY_INTERSECT_ASSOC () Compares the key name and key values and returns an array of intersections of two arrays. 4
Array_intersect_key () Computes the intersection of an array by using the key name comparison. 5
ARRAY_INTERSECT_UASSOC () Computes the intersection of an array with an index check and compares the index with a callback function. 5
Array_intersect_ukey () Computes the intersection of the array using the callback function to compare the key name. 5
Array_key_exists () Checks whether the given key name or index exists in the array. 4
Array_keys () Returns all the key names in the array. 4
Array_map () The callback function is acting on the cell of the given array. 4
Array_merge () Merges one or more arrays into an array. 4
Array_merge_recursive () Recursively merge one or more arrays. 4
Array_multisort () Sorts multiple arrays or multidimensional arrays. 4
Array_pad () Fills an array with a value to a specified length. 4
Array_pop () Eject the last cell of the array (out of the stack). 4
Array_product () Calculates the product of all the values in an array. 5
Array_push () Presses one or more units (elements) into the end of the array (into the stack). 4
Array_rand () Randomly selects one or more elements from an array and returns. 4
Array_reduce () Iteratively simplifies the array to a single value using the callback function. 4
Array_reverse () Flips the order of elements in the original array, creates a new array, and returns. 4
Array_search () Searches the array for a given value, and returns the corresponding key name if successful. 4
Array_shift () Deletes the first element in the array and returns the value of the deleted element. 4
Array_slice () Takes a value out of a condition in an array and returns it. 4
Array_splice () Remove a portion of the array and replace it with other values. 4
Array_sum () Calculates the and of all the values in the array. 4
Array_udiff () Use the callback function to compare data to compute the difference set of an array. 5
ARRAY_UDIFF_ASSOC () Calculates the difference set of an array with an index check and compares the data with a callback function. 5
ARRAY_UDIFF_UASSOC () Calculates the difference set of an array with an index check and compares the data and index with the callback function. 5
Array_uintersect () Computes the intersection of the array and compares the data with the callback function. 5
ARRAY_UINTERSECT_ASSOC () Computes the intersection of the array with the index check and compares the data with the callback function. 5
ARRAY_UINTERSECT_UASSOC () Computes the intersection of the array with the index check and compares the data and index with the callback function. 5
Array_unique () Deletes the duplicate value in the array. 4
Array_unshift () Inserts one or more elements at the beginning of the array. 4
Array_values () Returns all the values in the array. 4
Array_walk () Apply a user function to each member in the array. 3
Array_walk_recursive () Each member of an array applies a user function recursively. 5
Arsort () Reverse-Sort the array and keep the index relationship. 3
Asort () The array is sorted and the index relationship is maintained. 3
Compact () Create an array that includes the variable names and their values. 4
Count () Calculates the number of elements in an array or the number of attributes in an object. 3
Current () Returns the current element in an array. 3
each () Returns the current key/value pair in the array and moves the array pointer one step forward. 3
End () Points the array's internal pointer to the last element. 3
Extract () Imports a variable from an array into the current symbol table. 3
In_array () Checks whether the specified value exists in the array. 4
Key () Gets the key name from the associative array. 3
Krsort () The arrays are sorted in reverse order by key names. 3
Ksort () The array is sorted by key name. 3
List () Assign the values in the array to some variables. 3
Natcasesort () Use the "natural sort" algorithm to sort the case-insensitive letters of the array. 4
Natsort () Sort the array using the natural sort algorithm. 4
Next () Moves the internal pointer in the array forward one bit. 3
POS () The alias for current (). 3
Prev () Returns the internal pointer of an array to a bit. 3
Range () Creates an array that contains the elements of the specified range. 3
Reset () Points the array's internal pointer to the first element. 3
Rsort () Reverse-Sort the array. 3
Shuffle () Rearrange the elements in the array in random order. 3
sizeof () The alias for Count (). 3
Sort () Sort the array. 3
Uasort () Use the user-defined comparison function to sort the values in the array and keep the index associated. 3
Uksort () Use the user-defined comparison function to sort the key names in the array. 3
Usort () Use the user-defined comparison function to sort the values in the array. 3

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