Question

我在文本文件中有以下字符串：

^b^B

我试图把它分成两个变量。我当前的代码正在使用explode()，但它无法正常工作：

$num1 = '^b';
$num2 = '^B';

如何使用PHP实现此目的？

这是我的代码

<?php 
if(isset($_POST['refresh'])) {
exec('/var/www/www.rfteste.com/htdocs/estado.sh');
}
if(isset($_POST['on'])) {
exec('/var/www/www.rfteste.com/htdocs/on.sh');
}
if(isset($_POST['off'])) {
exec('/var/www/www.rfteste.com/htdocs/off.sh');
}
echo "<H3>CONTROL PANEL</H3>";
$str = file_get_contents("/var/www/www.rfteste.com/htdocs/refresh.txt");
$vals = explode("^", $str);
$num1 = "^".$vals[0];
$num2 = "^".$vals[1];
$onoff= "^A";
if($num2 == $onoff)
echo "<b>on</b>";
else
echo "<b>off</b>";
?>
<html>
<body>
<form method="post" action="">
<p>
<center><input type="submit" value="on" name="on""';" /></center>
<center><input type="submit" value="off" name="off""';" /></center>
<center><input type="submit" value="refresh" name="refresh""';" /></center>

Answer 1

使用preg_split()查看断言：

list($num1, $num2) = preg_split('/(?<=\^b)/', $str);

<强>尸检：

/ - 开始分隔符
(?<= - 开始积极的观察（意思是“如果前面有”）
- \^b - 匹配文字字符^b
) - 结束积极的外观
/ - 结束分隔符

<强>可视化：

enter image description here

简单来说，它意味着：在^b前面的地方进行拆分，并使用list构造将数组值分配给变量$num1和$num2

Demo

Answer 2

使用preg_match_all()：

<?php
$str = '^b^B';
preg_match_all('/(\^.)/', $str, $matches);

var_dump($matches);

Answer 3

#Pull all of the contents of file, myfile.txt, into variable, $str
$str = file_get_contents("myfile.txt");

#split up the data in $str, at every instance of '^'. 
$vals = explode("^", $str);
#now $vals is an array of strings

#concatenate the "^" back into the strings as they were removed by explode.
$num1 = "^".$vals[0];
$num2 = "^".$vals[1];

如何在PHP中的字符串之间拆分？

3 个答案: