//$c = $a ?? $b; 等效 $c = isset($a) ? $a : $b;
//$c = $a ?: $b; 等效 $c = $a ? $a : $b;
$a = 'a';
$b = 'b';
$c = $a ?? $b; //a
$c = $a ?: $b; //a
$a = false;
$b = 'b';
$c = $a ?? $b; //false
$c = $a ?: $b; //b
博客列表 > PHP 三元运算 ??与?:
//$c = $a ?? $b; 等效 $c = isset($a) ? $a : $b;
//$c = $a ?: $b; 等效 $c = $a ? $a : $b;
$a = 'a';
$b = 'b';
$c = $a ?? $b; //a
$c = $a ?: $b; //a
$a = false;
$b = 'b';
$c = $a ?? $b; //false
$c = $a ?: $b; //b
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