PHP中类似$a && $b = $c 语法的用法和实例
2023-09-14 08:56:56 时间
$a && $b = $c 表示:如果$a为真,则执行$b = $c,否则不执行。
可以用if语句替代:
if ($a) { $b = $c; }
其他php7写法:
$a = 1;$b = 2;$c = 3; $a? :$b=$c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:1b:2c:3
$a = 0;$b = 2;$c = 3; $a? :$b=$c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:0b:3c:3
如果$a 为真则执行$b 否则不执行
return $a && $b;
如果$a 为真则执行$a=$b 否则不执行
$a && $a=$b;
注意:这是种写法,但在项目里一般是不允许这样写,一是这种语法那天不支持了,二是给别人造成阅读上的障碍,代码风格难以统一
实例1:
$a = 1;$b = 2;$c = 3; $a && $b = $c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:1 b:3 c:3
实例2:
$a = 0;$b = 2;$c = 3; $a && $b = $c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:0 b:2 c:3
实例3:
$a = 1;$b = 0;$c = 3; $a && $b = $c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:1 b:3 c:3
实例4:
$a = 1;$b = 2;$c = 3; $a ||$b = $c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:1 b:2 c:3
实例5:
$a = 0;$b = 2;$c = 3; $a || $b = $c; echo "a:$a"; echo "b:$b"; echo "c:$c"; //输出是 a:0 b:3 c:3
实例6:
$a = 1;$b = 2;$c = 3;$d = 4;$e = ['10']; $a && $b && $c != $d && $e[] = $c; print_r(['$a'=>$a,'$b'=>$b,'$c'=>$c,'$d'=>$d,'$e'=>$e]); //输出是 Array ( [$a] => 1 [$b] => 2 [$c] => 3 [$d] => 4 [$e] => Array ( [0] => 10 [1] => 3 ) )
实例7:
$a = 1;$b = 0;$c = 3;$d = 4;$e = ['10']; $a && $b && $c != $d && $e[] = $c; print_r(['$a'=>$a,'$b'=>$b,'$c'=>$c,'$d'=>$d,'$e'=>$e]); 输出是 Array ( [$a] => 1 [$b] => 0 [$c] => 3 [$d] => 4 [$e] => Array ( [0] => 10 ) )
实例8:
$a = 0;$b = 2;$c = 3;$d = 4;$e = ['10']; $a && $b && $c != $d && $e[] = $c; print_r(['$a'=>$a,'$b'=>$b,'$c'=>$c,'$d'=>$d,'$e'=>$e]); //输出是 Array ( [$a] => 0 [$b] => 2 [$c] => 3 [$d] => 4 [$e] => Array ( [0] => 10 ) )
实例9:
$a = 1;$b = 2;$c = 3;$d = 4;$e = ['10']; $a && $b && $c != $d && $e[] = $c; print_r(['$a'=>$a,'$b'=>$b,'$c'=>$c,'$d'=>$d,'$e'=>$e]); //输出是 Array ( [$a] => 1 [$b] => 2 [$c] => 3 [$d] => 4 [$e] => Array ( [0] => 10 [1] => 3 ) )
实例10:
$a = 1;$b = 2;$c = 3;$d = 3;$e = ['10']; $a && $b && $c != $d && $e[] = $c; print_r(['$a'=>$a,'$b'=>$b,'$c'=>$c,'$d'=>$d,'$e'=>$e]); //输出是 Array ( [$a] => 1 [$b] => 2 [$c] => 3 [$d] => 3 [$e] => Array ( [0] => 10 ) )
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