Php cannot modify a field after it is assigned a value. how can this problem be implemented?

Php itself does not have modifiers similar to C # readonly. it should be implemented through design. php itself does not have modifiers similar to C # readonly. it should be implemented through design.

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Php itself does not have modifiers similar to C # readonly. it should be implemented through design.

Isn't the constant enough?
Define (key, value)

Talk is cheap, I will show you the code demo.
Like this:

// 1. first snippetclass HelloSomeOne {const NAME = "PHP technology Daquan"; // todo something else .} // 2. second snippet // not in class body innerconst NAME = "PHP technology Daquan ";

Php does not provide such a function, but in the object-oriented design, it can be implemented through the set/get method.

class {    private $a = null;        public function setA($a) {        if (null === $this->a) {            $this->a = $a;        }    }    public function getA() {        return $this->a;    }}

For the set/get method, use the _ set/_ get magic functions to achieve better writing performance.

Define can be used in PHP scripts, and const can be used in PHP classes.