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$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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