How to define an array in php

How to define an array in php?

How to define arrays in PHP:

1. PHP defines the format of arrays:

array name=array();

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

then assigns a value to the element:

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

2. How to output an array in PHP:

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

You can also assign values ​​directly 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"]="abc@abc.com";

can also be done like this

$aa=array("name"=>"joan","num"=>"9018","email"=>"abc@abc.com");

Define the elements of a one-dimensional array as an array, which is a two-dimensional array.

$aa=array(0=>"a1",1=>"a2");
$bb=array(0=>"b1",1=>"b2");
$cc=array(0=>$aa;1=>$bb);

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

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

4. The elements of the array are not only numbers and strings, but also objects of classes.

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