Question

与字符不同，用双反斜杠替换单个反斜杠不适用于数字。有没有办法在PHP中完成此操作？。

$attributes = "red\blue\green";
echo "<br>".str_replace("\\", "\\\\", $attributes);
//Output: red\\blue\\green
echo "<br>".preg_replace("/\\\\/", "\\\\\\\\", $attributes);
//Output: red\\blue\\green

// Unlike for characters, it doesn't work for numbers
$attributes = "25\30\35\40\45";
echo "<br>".str_replace("\\", "\\\\", $attributes);
//Output: 25 %
echo "<br>".preg_replace("/\\\\/", "\\\\\\\\", $attributes);
//Output: 25 %

Answer 1

这是由双引号引起的-更改为单引号，如下所示：

$attributes = '25\30\35\40\45';
echo "<br>".str_replace('\\', '\\\\', $attributes);

工作正常，双引号内的\将字符串解析为octal notation-单引号将解析字符串形式。

Answer 2

您可以使用 preg_replace

$attributes = "red\blue\green";
$newstring = preg_replace('/\\\\/','\\\\\\\\',$attributes);

echo  $newstring;

DEMO

并与 str_replace

一起使用

$attributes = '25\30\35\40\45';
$newstring = str_replace('\\','\\\\',$mystring);

echo $newstring;

DEMO

PHP-如何用双反斜杠替换数字前面的单反斜杠

2 个答案: