Question

我有一个这样的字符串：

$str = "This product price is 23,39 and sale end after 29th June";

我需要在","之后用".-"替换两个字符，因此输出如下：

This product price is 23.- and sale end after 29th June

我尝试了但删除了最后3个字符：

 echo substr($string, 0, strlen($string) - 3);

请帮我解决这个问题。

Answer 1

首先，我将尝试选择需要替换的字符串：

substr($str, strpos($str, ","), 3);
// Gives me ,39 - 3 characters from the ,.

现在我将其替换为.--

<?php
  $str = "This product price is 23,39 and sale end after 29th June";
  echo str_replace(substr($str, strpos($str, ","), 3), ".--", $str);
?>

这给了我一个输出：

This product price is 23.-- and sale end after 29th June

这是你需要的吗？这很简单，不需要RegEx。在这种情况下，不确定RegEx是否会更有效。我会这样做。