Detailed explanation of str_replace() substring replacement function

In the last article, we introduced "Converting php variables to json format data". In this article, we will introduce strings. String is a common data type that is operated during php. For substring operations, php has built-in str_replace(). This article will show you Let’s take a look. First, let's take a look at the syntax of the str_replace() function.

str_replace   ( mixed $search   , mixed $replace   , mixed $subject   , int &$count = ?   )

• $search: The target that needs to be searched
  

• $replace: The value that needs to be replaced with the target

• $subject: String or array to be processed

• $count: Optional, the number of times replacement occurs

• Return value: This function returns the replaced array or string.

Code example:

1. The parameters are all strings

<?php
$str="Chinese php.com is better";
$str2 = str_replace("com", "cn",$str,$count);
echo $str.",经过".$count."次替换后，变为：".$str2;
?>

输出：Chinese php.com is better,经过1次替换后，变为：Chinese php.cn is better

2. The parameters are all arrays

<?php
$search  = array(&#39;A&#39;, &#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;);
$replace = array(&#39;B&#39;, &#39;C&#39;, &#39;D&#39;, &#39;E&#39;, &#39;F&#39;);
$subject = &#39;A&#39;;
echo str_replace($search, $replace, $subject);

输出：F

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