What is the string query function in php

php string query function is: 1. stripos() function, which can find the first occurrence position of the specified character; 2. strpos() function, which can find the first occurrence position of the specified character; 3. strripos() Function that can find the position where the specified character last appeared; 4. strrpos() function.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

String in php Query function

#1, stripos() function

stripos() is used to find the first occurrence of a certain part of a string in a string ( not case sensitive).

<?php
$findme = &#39;c&#39;;
$mystring1 = &#39;xyz&#39;;
$mystring2 = &#39;ABC&#39;;
$pos1 = stripos($mystring1, $findme);
$pos2 = stripos($mystring2, $findme);
var_dump($pos1);
var_dump($pos2);
?>

2. strpos() function

strpos() is used to find the first occurrence of a string (case sensitive ).

<?php
$findme = &#39;c&#39;;
$findme1 = &#39;C&#39;;
$mystring = &#39;ABCabc&#39;;
$pos1 = strpos($mystring, $findme);
$pos2 = strpos($mystring, $findme1);
var_dump($pos1);
var_dump($pos2);
?>

3. strripos() function

strripos() is used to calculate the last time the specified string is in the target string The position in which it appears (case insensitive).

<?php
$findme = &#39;c&#39;;
$findme1 = &#39;C&#39;;
$mystring = &#39;ABCabcabcABC&#39;;
$pos1 = strripos($mystring, $findme);
$pos2 = strripos($mystring, $findme1);
var_dump($pos1);
var_dump($pos2);
?>

4. strrpos() function

strrpos() is used to calculate the last time the specified string is in the target string Where it appears

<?php
$findme = &#39;c&#39;;
$findme1 = &#39;C&#39;;
$mystring = &#39;ABCabcabcABC&#39;;
$pos1 = strrpos($mystring, $findme);
$pos2 = strrpos($mystring, $findme1);
$pos3 = strrpos($mystring, $findme1,-5);
var_dump($pos1);
var_dump($pos2);
var_dump($pos3);
?>

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