PHP 5.6.3 Parse error: syntax error, unexpected '[' in class

问题

While I was creating a class in php, I experienced this error:

Parse error: syntax error, unexpected '[', expecting ',' or ';' on line 5

A simple example:

<?php

class MyClass
{
  public $variable["attribute"] = "I'm a class property!";
}

?>

I already had a look at Reference - What does this error mean in PHP? but this doesn't seem to fit to my case. The problem of all other existing Questions seem to rely to an old PHP Version. But I am using PHP 5.6.3!

What can I do? Am I just sightless?

回答1:

You can't explicitly create a variable like that (array index). You'd have to do it like this:

class MyClass {
    // you can use the short array syntax since you state you're using php version 5.6.3
    public $variable = [
        'attribute' => 'property'
    ];
}

Alternatively, you could do (as most people would), this:

class MyClass {
    public $variable = array();

    function __construct(){
        $this->variable['attribute'] = 'property';
    }
}
// instantiate class
$class = new MyClass();

回答2:

I guess you should declare it the way it is shown below :

class MyClass
{
   public $variable = array( "attribute" => "I'm a class property!" );
}

回答3:

Make an array first. Use the code below

<?php

class MyClass
{
public $variable = array("attribute"=>"I'm a class property!");

}

?>

HOpe this helps you

回答4:

You cannot declare class members like this. Also you cannot use expressions in class member declarations.

There are two ways to achieve what you are looking for :

class MyClass
{
    public $variable;
    function __construct()
    {
        $variable["attribute"] = "I'm a class property!";
    }
}

or like this

class MyClass
{
    public $variable = array("attribute" => "I'm a class property!");
}

来源：https://stackoverflow.com/questions/27887187/php-5-6-3-parse-error-syntax-error-unexpected-in-class

标签

php

arrays

php-parse-error