How to query the occurrence position of a string in php

4 methods: 1. Use stripos() to return the position of the first occurrence (not case sensitive), the syntax is "stripos(string, query value)"; 2. Use strpos(), Return the position of the first occurrence (case-sensitive), the syntax is "strpos(string, query value)"; 3. Use strripos() to return the position of the last occurrence, the syntax is "strripos(string, query value)" ;4. Use strrpos(), the syntax is "strrpos(string, query value)".

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

Method 1: Use stripos() Function

stripos() function finds the first occurrence of a string within another string (case-insensitive).

Return value: Returns the position of the first occurrence of a string in another string, or FALSE if the string is not found. Note: The string position starts from 0, not from 1.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="Hello world!";
echo "原字符串：".$str."<br>";
$find="world";
echo "指定子串world的出现位置：".stripos($str,$find);
?>

Method 2: Use the strpos() function

strpos() function to find the first string in another string The position of an occurrence (case sensitive).

Return value: Returns the position of the first occurrence of a string in another string, or FALSE if the string is not found.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="I love php, I love php too!";
echo "原字符串：".$str."<br>";
$find1="php";
echo "指定子串php的出现位置：".strpos($str,$find1)."<br>";
$find2="PHP";
echo "指定子串PHP的出现位置：".strpos($str,$find2);
?>

Method 3: Use strripos() function

strripos() function finds the last string in another string The position of one occurrence (case-insensitive).

Return value: Returns the position of the last occurrence of a string in another string, or FALSE if the string is not found.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="I love php, I love php too!";
echo "原字符串：".$str."<br>";
$find1="php";
echo "指定子串php的出现位置：".strripos($str,$find1)."<br>";
$find2="PHP";
echo "指定子串PHP的出现位置：".strripos($str,$find2);
?>

Method 4: Use the strrpos() function

strrpos() function to find the last string in another string The position of an occurrence (case sensitive).

Return value: Returns the position of the last occurrence of a string in another string, or FALSE if the string is not found.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str="I love php, I love php too!";
echo "原字符串：".$str."<br>";
$find1="php";
echo "指定子串php的出现位置：".strrpos($str,$find1)."<br>";
$find2="PHP";
echo "指定子串PHP的出现位置：".strrpos($str,$find2);
?>

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