<?php
class A {
public static function hi() {
echo __CLASS__,' -> A';
}
public static function test() {
// self::hi(); // 调用当前A类 A::hi(); 输出 A -> A
// static::hi(); // 调用子B类 B::hi()覆盖了A::hi(); 输出 B -> B
static::child(); // 调用子B类 B::child()
// self::child(); // Fatal error: Call to undefined method A::child()
}
}
class B extends A {
public static function hi() {
echo __CLASS__,' -> B';
}
public static function child() {
echo 'child';
}
}
B::test();
A::test();
child
Fatal error: Uncaught Error: Call to undefined method A::child() in /in/gf1vV:10
Stack trace:
#0 /in/gf1vV(25): A::test()
#1 {main}
thrown in /in/gf1vV on line 10
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
child
Fatal error: Uncaught Error: Call to undefined method A::child() in /in/gf1vV:10
Stack trace:
#0 /in/gf1vV(25): A::test()
#1 {main}
thrown in /in/gf1vV on line 10
Process exited with code 255.