php中的非条件语句while循环括号！？ [英] non conditional statement inside php while loop parentheses !?

问题描述

大家好，



请查看以下代码：

Hello everybody,

Please take look at the following code:

<?php
   $numberedString = "1234567890123456789012345678901234567890";
$offset = 0; // initial offset is 0
$fiveCounter = 0;

// First check if there is a "5" at position 0.
if(strpos($numberedString, "5") == 0){
  $fiveCounter++;
    echo "<br />Five #$fiveCounter is at position - 0";
}

// Check the rest of the string for 5's
while($offset = strpos($numberedString, "5", $offset + 1)){
    $fiveCounter++;
    echo "<br />Five #$fiveCounter is at position - $offset";
}
?>

here while循环括号中的语句不是条件的（因为它不返回布尔值），但是这段代码是如何工作的？

here the statement inside while loop parentheses is not conditional(because it does not return boolean value),but how does this code works well?

推荐答案

numberedString = 1234567890123456789012345678901234567890;

numberedString = "1234567890123456789012345678901234567890";

offset = 0 ; // 初始偏移量为0

offset = 0; // initial offset is 0

fiveCounter = 0 ;

// 首先检查位置0是否有5。
if（strpos（

fiveCounter = 0; // First check if there is a "5" at position 0. if(strpos(

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