How to use PHP string query function

php How to use string query function

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php The string query function is ：1、stripos() function , You can find the first occurrence position of the specified character ;2、strpos() function , You can find the first occurrence position of the specified character ;3、strripos() function , You can find the position of the last occurrence of the specified character ;4、strrpos() function .

The operating environment of this tutorial ：windows7 System 、PHP7.1 edition 、DELL G3 The computer

php String query function in

1、stripos() function

stripos() Used to find the first occurrence position of a part of the string （ Case insensitive ）.

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

2、strpos() function

strpos() Used to find the position where the string first appears （ Case sensitive ）.

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

3、strripos() function

strripos() Used to calculate the position of the last occurrence of the specified string in the target string （ Case insensitive ）.

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

4、strrpos() function

strrpos() Used to calculate the position of the last occurrence of the specified string in the target string

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

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