Questions about conditional expressions in while loop

<code>while ($i = 'AAA' && $j = 'BBB') {
    var_dump($i, $j);
    sleep(3);
}

</code>

<code class="php">输出结果
bool(true)
string(3) "BBB"</code>

<code>
-------------------------------------------------------------

在写一个后台监听程序的时候使用了while循环，于是纠结了一下`while`中的条件表达式</code>

1. For the above code, I expected to output AAA BBB, but why is it true BBB

2. Look at this code

   <code>while($ret = 100) {
       var_dump($ret) // output:100
   }</code>

   How does the conditional expression $ret=100 in the brackets here result in true or false. What I want is to first assign the value 100 to the $ret variable, and then perform a Boolean conversion on $ret to get the result.

   Hope everyone can help clear up the confusion. Thank you.

Reply content:

<code>while ($i = 'AAA' && $j = 'BBB') {
    var_dump($i, $j);
    sleep(3);
}

</code>

<code class="php">输出结果
bool(true)
string(3) "BBB"</code>

<code>
-------------------------------------------------------------

在写一个后台监听程序的时候使用了while循环，于是纠结了一下`while`中的条件表达式</code>

1. For the above code, I expected to output AAA BBB, but why is it true BBB

2. Look at this code

   <code>while($ret = 100) {
       var_dump($ret) // output:100
   }</code>

   How does the conditional expression $ret=100 in the brackets here result in true or false. What I want is to first assign the value 100 to the $ret variable, and then perform a Boolean conversion on $ret to get the result.

   Hope everyone can help clear up the confusion. Thank you.

<code>if (($i = 'AAA') && ($j = 'BBB')) {
    var_dump($i, $j);
}
</code>

Attention && Priority

Operator logic problem, price brackets are wrong

<code class="php">while (($i = 'AAA') && ( $j = 'BBB')) {


    var_dump($i, $j);// true bbbbb
    sleep(3);
}</code>

1. The comma operator causes the output bbb, V=1,2. At this time, v is 2
   2. An infinite loop. Convert to boolea can be ret = ret && true