在PHP中使用赋值运算符进行while循环 [英] while loop in php with assignment operator

问题描述

我正在查看的代码可以做到这一点...

the code I'm looking at does this...

while ($info=mysql_fetch_array($data_jurisdiction))
{
//some stuff
}

我想知道while语句的作用是什么?它里面有一个赋值运算符，因此只要$ info被赋值为false以外的值，该代码就会执行吗?

I'm wondering what does this while statement do? it has an assignment operator within it, so as long as $info gets assigned a value other than false, this code will execute?

推荐答案

[... S] o，只要为$ info分配了除false以外的其他值，该代码就会执行?

[... S]o as long as $info gets assigned a value other than false, this code will execute?

是的，是的.即使该表达式中有一个赋值运算符，该表达式本身仍代表一个值.在这种情况下，整个表达式的结果等于对$info的赋值.换句话说:该表达式与$info 或相同，或者该表达式已分配给$info-最后一个变体也许是最好的描述.

Quite, yes. Even there is an assignment operator within that expression, the expression itself still stands for a value. In this case the result of the whole expression is equal to the assignment to $info. In other words: The expression is the same as $info or the expression has been assigned to $info - the last variant is perhaps the best description.

因此，现在每当$info等于true时，将执行while中的代码块.

So now whenever $info equals to true, the code block inside while will be executed.

请记住，比较是宽松比较.因此，不仅false还是NULL或一个空数组都将停止内部代码块的执行.

Keep in mind that the comparison is a loose comparison. So not only false but as well NULL or an empty array will stop the execution of the inner code-block.

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