Haunted! PHP string Array Crossover

$where = '1=1';$keyword = $_GET['keyword'];        if($keyword) {    $where['title'] = array('like', "%$keyword%");}var_dump($where);竟然打印出来：A=1到底是怎么样的转换流程？

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$where = '1=1';$keyword = $_GET['keyword'];        if($keyword) {    $where['title'] = array('like', "%$keyword%");}var_dump($where);竟然打印出来：A=1到底是怎么样的转换流程？

First of all, let me spit on the trough (not to vomit the groove will die!) )：

1. $whereis a string, what kind of a ghost are you writing $where['title'] ?

2. You assign an array assignment to a string in a string, what the hell is that?

I'll get rid of some of your problems assorted useless code, and then refine the problem:

$where = '1=1';$where['title'] = array();var_dump($where);

And above The spit groove corresponds to, we also step by step to see:
$where['title']The expression is the $where character of the subscript in the string, note that the subscript 'title' 's legal value is [0-string length minus 1], then PHP for the illegal subscript, in fact, and $where[0] the role is consistent.
This problem is further simplified to:

$where = '1=1';$where[0] = array();var_dump($where);

Knowing that $where[0] actually refers to the $where first character of the string, the following is the " you array assign an assignment to a string in a string, what's the ghost?" "
Let's do a test below:

var_dump( (string)array() );

What do you suppose will output?

PHP Notice:  Array to string conversion in /home/nfer/temp.php on line 8string(5) "Array"

Well, it's a good idea to $where[0] = array(); assign a string Array to $where the first character of a string.
Bingo, the output isstring(3) "A=1"

Finally, let me also write a haunted code:

$where = 'A=1';$keyword = $_GET['keyword'];        if($keyword) {    $where['title'] = $keyword == 123;}var_dump($where);

What do you think the results will output?

1. $where = 1, this is right, first this is the string.
2. Then you put the $where as an array and put the $where[' title ' = Array (' Like ', "xxx"), assigning the value of the past, which is not scientifically put.

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