直接上代码
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trait T1 {
public static $a=1;
public static $b= [];
public static function getC(){
echo 'class: ' . get_class() . "\n";
}
}
class a{
use T1;
}
class b extends a{
use T1;
public static function getHw(){
echo 'Hello';
}
}
b::getHw();
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运行以上代码，错误信息
Fatal error: a and T1 define the same property ($b) in the composition of b. However, the definition differs and is considered incompatible. Class was composed
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此时把
public static $b= [];改为public static $b= 1;非数组的其他类型正常运行。
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至于父类和子类都use T1,是为了让b::getC();取到的类名是b而不是a