PHP在类中使用其他变量的静态变量

我对我的PHP应用程序使用全局变量类有一个小问题。我真的想要使用这种存储变量的方法，因为我知道随着时间的推移我会改变文件名和文件夹结构。PHP在类中使用其他变量的静态变量

我想在它下面的变量中使用变量public $root，它们不在方法中。

像这样：

public $root = "/rootfolder/"; 
public $something = $root . "path/";

但我不断收到此错误：

Fatal error: Constant expression contains invalid operations in C:_server\htdocs\p\chestools\core\php\global.php on line 26

这里是我的整页：

class gvars { 

    public static $debug_mode = true; 

    /* 
    * Tab Title Control 
    * n\a 
    */ 
    public static $tab_after    = " | Chestools"; 
    public static $tab_name_enable   = true; 

    /* 
    * Dialouge Control 
    * utils.dialouges.php 
    */ 
    public static $dia_show_fatal = true; 
    public static $dia_enabled = true; 

    /* 
    * Page Paths 
    * n\a 
    */ 
    public static $root      = "/p/chestools/"; 
    public static $path_home    = "Home"; 
    public static $path_contactus   = "Contactus"; 
    public static $path_login    = "Login"; 
    public static $path_signup    = "Signup"; 
    //General Pages 
    public static $path_help    = "Help"; 
    public static $path_profile    = "Profile"; 
    //Student Pages 
    public static $path_select_cat   = "Catagorys"; 
    //Teacher Pages 
    public static $path_view_student  = "View"; 
    public static $path_create    = "Create"; 
    //Catagorys 
    public static $path_cat_math   = "c/math/"; 
    public static $path_cat_life_sci  = "c/life-science/"; 
    public static $path_cat_int_sci   = "c/interactive-science/"; 
    public static $path_cat_earth_sci  = "c/earth-science/"; 
    //Security 
    public static $path_sec_finish   = "security/Finish"; 
    public static $path_sec_change_password = "security/ChangePassword"; 
    public static $path_sec_change_email = "security/ChangeEmail"; 
    public static $path_sec_checkpoint  = "security/Checkpoint"; 

    /* 
    * System Paths 
    * n\a 
    */ 
    public static $head_css     = "core/css/chestools.css"; 
    public static $head_js_app    = "core/js/app.js"; 

    /* 
    * Footer Resource Paths 
    * n\a 
    */ 
    public static $path_dwa     = "about/district-wide-accounts/"; 
    public static $path_isa     = "about/independent-school-   accounts/"; 
    public static $path_support    = "support/"; 
    public static $path_pp     = "Privacy"; 
    public static $path_tos     = "Terms"; 

}

来源

2016-09-30 Jacob Jewett

无法在[5.0.0 - 5.6.26，hhvm-3.10.0 - 3.14.4，7.0.0 - 7.1.0RC3]（https://3v4l.org/88Lot#v500） – Gordon

这似乎是您使用的PHP版本小于5.6

如果你想真正串联在属性初始化的内容，你可以做到这一点通过__construct()功能

PHP版本之前5.6

退房PHP手册在以下链接Property declarations。

...This declaration may include an initialization, but this initialization must be a constant value--that is, it must be able to be evaluated at compile time and must not depend on run-time information in order to be evaluated.

PHP 5.6

PHP 5.6起，您可以在PHP声明默认的类属性时使用串联。

来源

2016-09-30 02:03:51 Anass

上次重现检查我的PHP版本，它是5.6.21。 –

你能告诉我们你的代码第26行的内容是什么吗？ – Anass

public static $ path_home =“Home”; –

PHP在类中使用其他变量的静态变量

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