Definition of php constants

{Code ...} here, the constant FRUIT can be defined as [& #039; apple & #039;, & #039; orage & #039;] (this is an array ), shouldn't FRUIT be a number or string? Please answer !!

class testClass {    const FRUIT = ['apple','orage'];}

Can the constant FRUIT be defined as ['apple', 'orage']? (this is an array.) shouldn't FRUIT be a number or string? Please answer !!

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class testClass {    const FRUIT = ['apple','orage'];}

Can the constant FRUIT be defined as ['apple', 'orage']? (this is an array.) shouldn't FRUIT be a number or string? Please answer !!

A constant is a constant that cannot be changed. it does not have to be a number or a string.

PHP7 defines an array constant PHP70new-featres through defind ()

Eg:

    define('ANIMALS', [        'dog',        'cat',        'bird'    ]);echo ANIMALS[1]; // outputs "cat"`

You can also remove defind () from PHP7 and use const to define a constant array.

In addition, PHP7 also supports operations between constants. for example:const A = 1; const B =3; const C = A + B;

From PHP7, you can use define to define a constant array:
define('APP1', array(1,2,3)); var_export(APP1);
In earlier versions of PHP, you can first serialize the array into a string and then define a constant. when using PHP, you can deserialize it:
define('APP2', serialize(array(1,2,3))); var_export(unserialize(APP2));
PHP can also use const to define a constant array from 5.6:
const APP3 = array(1,2,3); var_export(APP3);

Const means that the variable definition cannot be changed. after the array is defined as const, the elements in the variable cannot be added or decreased.
Before 5.6.0, php does not have such a feature, which can be used at this time.

/** @const */private static $myArray = array(...);

.
5.6.0 began to add this feature, so this code has certain requirements for the php version of the machine to run.

It seems that this definition can be defined in the class from around 5.6.

Class SomeClass {const FRUIT = ['apple', 'orage'];} // Obtain echo SomeClass: FRUIT [0]; // apple

However, some IDEs do not support this function.