php面试题中常见的骚操作
码农编程进阶笔记
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· 2024-04-12
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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
:
1
b
:
2
c
:
3
$a
=
0
;
$b
=
2
;
$c
=
3
;
$a
?
:
$b
=
$c
;
echo
"a:
$a
"
;
echo
"b:
$b
"
;
echo
"c:
$c
"
;
//输出是
a
:
0
b
:
3
c
:
3
如果$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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