Detailed explanation of the difference and usage of strpos() and stripos() functions in php

This article mainly introduces the difference and usage of strpos() and stripos() functions in PHP. I hope it will be helpful to friends who need it. help!

strpos() function

This function helps us find the first occurrence of a string in another string Location. This returns the integer value of the first occurrence of the string. This function is case-sensitive, which means it treats uppercase and lowercase characters differently.

Grammar:

strpos(original_str, search_str, start_pos)

Usage of parameters:

Of the three parameters specified in the grammar, there are two are mandatory and one is optional.

These three parameters are described as follows:

original_str (mandatory): This parameter refers to the original string in which we need to search for the occurrence of the required string.

search_str (required): This parameter refers to the string we need to search for.

start_pos (optional): means that the search must start from the position of the string.

Return type:

This function returns an integer value that represents the index of original_str where the string search_str first appears.

strpos() function usage example:

<?php
function Search($search, $string){
    $position = strpos($string, $search, 5);
    if ($position == true){
        return "Found at position: " . $position;
    }
    else{
        return "Not Found";
    }
}

$string = "Welcome to PHP中文网";
$search = "PHP";
echo Search($search, $string);
?>

Output:

Found at position 11

stripos() function

This function also helps us find the first occurrence of a string in another string. This returns the integer value of the first occurrence of the string. This function is case-insensitive, which means it treats uppercase and lowercase characters equally. This function works similarly to strpos(), except that it is case-insensitive, whereas strpos() is case-sensitive.

Grammar:

stripos(original_str, search_str, start_pos)

Usage of parameters:

Among the three parameters specified in the grammar, Two are mandatory and one is optional

original_str (mandatory): This parameter refers to the original string in which we need to search for occurrences of the required string.

search_str (mandatory): This parameter refers to the string we need to find.

start_pos (optional): This parameter refers to the position where the search must start from the string.

Return type:

This function returns an integer value that represents the index of original_str where the string search_str first appears.

Stripos() function usage example:

<?php 

function Search($search, $string){ 
    $position = stripos($string, $search, 5);   
    if ($position == true){ 
        return "Found at position " . $position; 
    } 
    else{ 
        return "Not Found"; 
    } 
} 
  

$string = "Welcome to PHP中文网"; 
$search = "PHP"; 
echo Search($search, $string); 
?>

Output:

Found at position 11

Related recommendations: "PHP Tutorial"

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