PHP: ?? ? ???? ?? ?? ??
?? ??? PHP ??????? ??? ??? ???. ?? ?? ??? ?? ?? ??? ????? ???? ?? ??? ?????? ??? ? ????.
??? ?? ?? ??
?? 1: property_exists()
PHP? ??? ?????. property_exists() ??? ???? ??? ??? ??? ??? ?????.
<code class="php">$ob = (object) ['a' => 1, 'b' => 12];
if (property_exists($ob, 'a')) {
// Property 'a' exists
}</code>
?? 2: isset()
?? isset()? ???? ??? ??? ? ????. ??. ??? isset()? null? ??? ??? ?? false? ????? ?? ?????.
<code class="php">if (isset($ob->a)) {
// Property 'a' exists, even if its value is null
}</code>
???? ?? ?? ??
??? ??? ?? ????? ??? ???? ??? ??? ????? ??? ?? ??? ???? ??? property_exists()? ?????.
<code class="php">class Foo
{
public $bar;
}
$foo = new Foo();
var_dump(property_exists($foo, 'bar')); // true</code>
?? ??
?? ??? ?????.
<code class="php">$ob->a = null; var_dump(isset($ob->a)); // false</code>
??? isset() ?? a? null? ????? ??? false? ?????. ??? property_exists()? ?? ?? ???? ??? ??? ???? ?? ??? true? ?????.
<code class="php">class Foo
{
public $bar = null;
}
$foo = new Foo();
var_dump(property_exists($foo, 'bar')); // true
var_dump(isset($foo->bar)); // false</code>
??? ???? PHP?? ?? ??? ???? ???? ???? ??? ????? ???? ??? ? ????. ??? ??? ?????.
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