What is the function to create an array in php

There are many functions for creating arrays in php, the common ones are as follows:

1. array function

The array function is the most basic function for creating arrays. Its syntax is as follows:

array( [mixed $value,] [mixed $... ] )

Among them, value is the value of the array element,... indicates that multiple elements can be added, separated by commas. For example:

$arr1 = array('apple', 'orange', 'banana');

2. range function

The range function can create an array composed of elements in a specified range. Its syntax is as follows:

range( mixed $start, mixed $end [, number $step = 1 ] ) : array

Where, start is the starting value, end is the end value, and step is the step size. For example:

$arr2 = range(1, 10, 2); // 结果为[1, 3, 5, 7, 9]

3. explode function

explode function can split a string into an array according to the specified delimiter. Its syntax is as follows:

explode ( string $delimiter , string $string [, int $limit = PHP_INT_MAX ] ) : array

Among them, delimiter is the delimiter, string is the string to be split, and limit is an optional parameter, indicating the maximum number of array elements returned. For example:

$string = 'apple,orange,banana';
$arr3 = explode(',', $string); // 结果为['apple', 'orange', 'banana']

4. list function

The list function can assign the values ​​​​in an array to a set of variables. Its syntax is as follows:

list( mixed $var1 [, mixed $... ] ) : array

Among them, var1 is the variable to be assigned,... indicates that multiple variables can be added, separated by commas. For example:

$arr4 = array('apple', 'orange', 'banana');
list($fruit1, $fruit2, $fruit3) = $arr4; // $fruit1='apple', $fruit2='orange', $fruit3='banana'

5. compact function

The compact function can create an array based on the specified variable name. Its syntax is as follows:

compact ( mixed $varname1 [, mixed $... ] ) : array

Among them, varname1 Is the variable name to be added to the array,... indicates that multiple variable names can be added, separated by commas. For example:

$fruit1 = 'apple';
$fruit2 = 'orange';
$fruit3 = 'banana';
$arr5 = compact('fruit1', 'fruit2', 'fruit3'); // 结果为['fruit1'=>'apple', 'fruit2'=>'orange', 'fruit3'=>'banana']

The above are several common functions for creating arrays in PHP. Developers can choose the appropriate function to create arrays according to their needs.

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