Instanceof v php
Příklady kódu
php instanceof
<?php
/*
*
* opcode number: 138
*/
$obj = new A();
if ($obj instanceof A) {
echo 'A';
}
?>
jak funguje metoda instanceof php
class MyClass {
}
$o1 = new MyClass();
$o2 = new MyClass();
$name = 'MyClass';
// in the cases below, $a gets boolean value true
$a = $o1 instanceof MyClass;
$a = $o1 instanceof $name;
$a = $o1 instanceof $o2;
// counter examples:
$b = 'b';
$a = $o1 instanceof 'MyClass'; // parse error: constant not allowed
$a = false instanceof MyClass; // fatal error: constant not allowed
$a = $b instanceof MyClass; // false ($b is not an object)
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