Conditional expression doubts in while loop

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

输出结果bool(true)string(3) "BBB"

-------------------------------------------------------------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

1. For the above code I expected output AAA BBB But why is it true BBB

2. Look at this piece of code.

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

   In this case, the conditional expression in parentheses $ret=100 is how the result is true or is false . I'm thinking of 100 assigning the value to the variable first $ret , and then the $ret boolean value to the result.

   I hope you will help us with doubts. Thank you, sir.

Reply content:

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

输出结果bool(true)string(3) "BBB"

-------------------------------------------------------------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

1. For the above code I expected output AAA BBB But why is it true BBB

2. Look at this piece of code.

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

   In this case, the conditional expression in parentheses $ret=100 is how the result is true or is false . I'm thinking of 100 assigning the value to the variable first $ret , and then the $ret boolean value to the result.

   I hope you will help us with doubts. Thank you, sir.

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

Note the && priority level

Operator logic problem, price brackets are on the square.

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

1. The comma operator causes output BBB, v=1,2 at this point, V is 2
   2. Dead Loop,. Convert to Boolea can ret = ret && true

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