问题
I'm getting this error:
Parse error: syntax error, unexpected '.', expecting ',' or ';' in /var/(...)/config.php on line 5
With this (simplified) code:
<?php
class Config
{
public static $somevar = "Date: " . date('Y');
}
?>
I thought this was valid php, but I guess not... what am I doing wrong here? Thanks!
回答1:
According to the PHP docs:
Like any other PHP static variable, static properties may only be initialized using a literal or constant; expressions are not allowed. So while you may initialize a static property to an integer or array (for instance), you may not initialize it to another variable, to a function return value, or to an object.
Try writing
Config::$somevar = "Date: " . date('Y');
after the class definition.
回答2:
No operation or function is allow for property initialization, because this is evaluated when parsing.
回答3:
From Manual
Like any other PHP static variable, static properties may only be initialized using a literal or constant; expressions are not allowed. So while you may initialize a static property to an integer or array (for instance), you may not initialize it to another variable, to a function return value, or to an object.
来源：https://stackoverflow.com/questions/4267050/strange-parse-error-with-static-concatenated-string-variable