Can php define an array?

Can define arrays. 3 methods: 1. Direct assignment method, the syntax is "$array variable name [subscript] = value;", where the subscript (key name) can be a string or an integer, and the subscript can be omitted; 2. Use The array() function defines an array, the syntax is "$array variable name=array(key 1=> value 1, key 2 => value 2,..., key N=> value N);"; 3. Use Array literal "[]" defines an array, and the syntax is "$array variable name=[key 1=> value 1, key 2 => value 2,..., key N=> value N];".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

php can define arrays. PHP provides a variety of methods to define and initialize arrays.

Method 1. Directly assign values to array elements

We can use the form "$Array variable name [subscript] = Value;" format to create and initialize the array

The subscriptcan be a string, an integer, or empty (that is, no specific index value is specified).

The subscript can be omitted.When we do not specify a specific index value within square brackets, the default is a numeric index, and the index value starts from 0 and increases by default.

Output result:

Method 2. Use array() function

key=>valueparameter pairs separated by commas.

"1","a"=>"",2=>"2","b"=>0,"c"=>"blue"); //输出语句 var_dump($array); ?>

Method 3: Use array literal "[]" to define the array

key=>valueparameter pairs. The syntax format is as follows:

$数组变量名 = [key1 => value1, key2 => value2, ..., keyN => valueN];

"1","a"=>"",2=>"2","b"=>0,"c"=>"blue"]; var_dump($array); ?>

=>symbol to specify the subscript, The default is an indexed array. The default index value also starts from 0 and increases in sequence. The sample code is as follows:

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