What are the methods to define arrays in php?

The methods to define arrays in PHP are: 1. PHP defines the format of the array, the code is [array name=array()]; 2. PHP output array method, the code is [foreach($aa as $val) {echo$val;}].

The methods to define arrays in PHP are:

1. The format of PHP array definition:

数组名=array();

For example: $aa=array();//This defines an array,

then assigns values ​​to the elements:

$aa[0]="9016";
 
$aa[1]="9017";
 
$aa[2]="9018";

2, PHP Method of outputting an array:

foreach($aa as $val)
 
{
 
echo$val;
 
}

You can also directly assign a value when defining the array

$aa=array(0=>"9016",1=>"9017";2=>"9018");

3. PHP arrays can also be subscripted with characters, not necessarily numbers. ：

$aa["name"]="Joan";
 
$aa["num"]="9018";
 
$aa["email"]=<a href="mailto:abc@abc.com" rel="external nofollow">abc@abc.com</a>;

You can also define the elements of a one-dimensional array as an array, which is a two-dimensional array.

$aa=array("name"=>"joan","num"=>"9018","email"=><a href="mailto:abc@abc.com" rel="external nofollow">abc@abc.com</a>);

At this time, $ cc[0] is also an array, $cc[1] is also an array, and $cc is a two-dimensional array.

Similarly, three-dimensional and four-dimensional arrays can also continue to be defined.

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