求助一个关于PHP数组的问题
$a[3] = 5;
$a["3"] = 6;
$a["3.14"] = 7;
$a[3.14] = 8;
echo $a[3], $a["3"], $a["3.14"], $a[3.14];输出为什么是 8878？
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喜欢技术，喜欢努力的人
Additionally the following key casts will occur:
in you case, the 3.14 
`$a[3] = 5;
$a["3"] = 6;`
both are same thing and will be cast to $a[3].
$a["3.14"] = 7;//"3.14" is a string and it won't be cast.
Summary:
`$a[3] = 5;
$a["3"] = 6; // $a[3] is 6 now.
$a["3.14"] = 7; //"3.14" is a string, no cast then.
$a[3.14] = 8; // 3.14 will be cast to 3 which results in $a[3] = 8
echo $a[3], $a["3"], $a["3.14"], $a[3.14];
is actually
echo $a[3],$a[3],$a["3.14"],$a[3]`
都用引号2019-07-17 19:36:10赞同 展开评论
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