Doubts about the conditional expression in the while loop

{Code ...} {code ...} {code ...} for the above code, I expected to output AAABBB, but why is it trueBBB? READ this code {code ...} here, how does the conditional expression $ ret100 in brackets determine whether the result is true or false. What I want is to set the value 100 first...

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

Output result bool (true) string (3) "BBB"

--------------------------------------------------------------- The while loop is used when writing a background listener, so the conditional expression in the 'While 'is entangled.

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

2. Read this code

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

   The conditional expression in brackets$ret=100How is the result returned?trueOrfalse. What I want is100This value is assigned$retVariable, and then$retReturns a boolean value.

   I hope you can help us solve this problem. Thank you.

Reply content:

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

Output result bool (true) string (3) "BBB"

--------------------------------------------------------------- The while loop is used when writing a background listener, so the conditional expression in the 'While 'is entangled.

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

2. Read this code

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

   The conditional expression in brackets$ret=100How is the result returned?trueOrfalse. What I want is100This value is assigned$retVariable, and then$retReturns a boolean value.

   I hope you can help us solve this problem. Thank you.

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

Note:&&Priority

For operator logic problems, the price bracket is Ouke.

while (($i = 'AAA') && ( $j = 'BBB')) {    var_dump($i, $j);// true bbbbb    sleep(3);}

1. The comma operator causes the output bbb, V = 1, 2 at this time, v is 2
   2. endless loops ,. Conversion to boolea can be ret = ret & true