Arrays are the kings of advanced data structures in PHP. PHP arrays are extremely flexible—they allow numeric, auto-incremented keys, alphanumeric keys or a mix of both, and are capable of storing practically any value, including other arrays.
All arrays are ordered collections of items, called elements. Each element has a value and is identified by a key that is unique to the array it belongs to. As I mentioned in the previous line, keys can be either integer numbers or strings of arbitrary length. So, lets have a look 5 ways to define array in php.
– Define an empty array.
$my_array_1 = array();
– Define an auto incremented indexed array.
$my_array_2 = array("elem_1","elem_2","elem_3");
– Define an array with assigned index(number)
$my_array_3 = array( 1=>"elem_1", 2=>"elem_2", 3=>"elem_3" );
– Define an array with assigned index(string)
$my_array_4 = array( "name"=>"my_name", "age"=>20, "sex" =>"male" );
– Define a multidimensional array:
$multi_dim_array = array(); $multi_dim_array = array("elem_1","elem_2"); $multi_dim_array = array("elem_3","elem_4"); echo $multi_dim_array; echo $multi_dim_array;
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