实践出真知~
输入测试:
- <?php
- $array = [
- 'a' => 1,
- 'b' => 2,
- 'c' => [],
- ];
-
- $a = $array['c'] ?? 0;
- $b = $array['c'] ?: 0;
- $c = $array['d'] ?? 0;
- $d = $array['d'] ?: 0;
- $e = $array['c'] ? 1 : 0;
- $f = isset($array['c']) ? 1 : 0;
- $g = $array['d'] ? 1 : 0;
- $h = isset($array['d']['e']) ? 1 : 0;
- $i = !empty($array['c']) ? 1 : 0;
- $j = !empty($array['d']) ? 1 : 0;
-
- var_dump($a);
- var_dump($b);
- var_dump($c);
- var_dump($d);
- var_dump($e);
- var_dump($f);
- var_dump($g);
- var_dump($h);
- var_dump($i);
- var_dump($j);
-
-
输出结果:
- PHP Notice: Undefined index: d in /home/fanyu/abc.php on line 11
- PHP Notice: Undefined index: d in /home/fanyu/abc.php on line 14
- array(0) {
- }
- int(0)
- int(0)
- int(0)
- int(0)
- int(1)
- int(0)
- int(0)
- int(0)
- int(0)
-
-