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@gabesullice
Last active June 26, 2023 09:57
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self vs static vs $this
<?php
class ParentClass {
public static string $foo = 'ooh';
public string $bar = 'lala';
public function __construct($arg) {
$this->bar = $arg;
}
public function dump(): void {
printf(
"Class: %s\nself::\$foo: %s\nstatic::\$foo: %s\n\$this::\$foo: %s\n\$this->bar: %s" . PHP_EOL,
static::class,
self::$foo,
static::$foo,
$this::$foo,
$this->bar,
);
}
}
class ChildClass extends ParentClass {
public static string $foo = 'ahh';
public string $bar = 'haha';
}
$parent = new ParentClass('parent');
$child = new ChildClass('child');
$parent->dump();
echo PHP_EOL;
$child->dump();
echo PHP_EOL;
echo "Setting ParentClass::\$foo = 'hmm'" . PHP_EOL;
ParentClass::$foo = 'hmm';
echo PHP_EOL;
$parent->dump();
echo PHP_EOL;
$child->dump();
@gabesullice
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gabesullice commented Jun 26, 2023

Prints:

Class: ParentClass
self::$foo: ooh
static::$foo: ooh
$this::$foo: ooh
$this->bar: parent

Class: ChildClass
self::$foo: ooh
static::$foo: ahh
$this::$foo: ahh
$this->bar: child

Setting ParentClass::$foo = 'hmm'

Class: ParentClass
self::$foo: hmm
static::$foo: hmm
$this::$foo: hmm
$this->bar: parent

Class: ChildClass
self::$foo: hmm
static::$foo: ahh
$this::$foo: ahh
$this->bar: child

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