Use stripos() in php to get the first occurrence of a string

In the previous article, we introduced "Detailed explanation of str_replace() substring replacement function ". In this article we mainly introduce the stripos() function. Strings are a frequently used data type in PHP. In some special scenarios, we may need to get the position where a specified string first appears in a string. PHP has a built-in stripos() function. This article will take you through it. one look. The first thing I need to understand is the syntax of the function.

stripos    ( string $haystack   , string $needle   , int $offset = 0   )

• $haystack: The string to be found
  

• $needle: The target character to be found
  

• $offset: Optional, search starts from the specified character position. If it is a negative number, the search starts this number of characters from the end of the character.
  

• Return value: The position where $needle appears in $haystack

Code example:

1. There are only two parameters: the string to be searched and the target character to be searched for

<?php
$str="Chinese php.com is better";
echo "出现的位置：".(stripos($str,&#39;com&#39;))."<br>";
?>

输出：出现的位置：12

2.Three parameters

<?php
$str="Chinese php.com is better .com";
echo  "第一次出现的位置：".(stripos($str,&#39;com&#39;))."<br>";
echo  "第二次出现的位置：".(stripos($str,&#39;com&#39;,(stripos($str,&#39;com&#39;))+1))."<br>";
?>

输出：  第一次出现的位置：12
        第二次出现的位置：27

Recommended: 《2021 PHP Interview Questions Summary (Collection)》《 php video tutorial》

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