indexOf and lastIndexOf in PHP

Question

In Java  we can use indexOf and lastIndexOf  Since those functions don t exist in PHP  what would be the PHP equivalent of this Java code   if req type equals  RMT        pt password   message substring message indexOf  -   1   else      pt password   message substring message indexOf  -   1 message lastIndexOf  -

User · Answer

In php    stripos   function is used to find the position of the first occurrence of a case-insensitive substring in a string  strripos   function is used to find the position of the last occurrence of a case-insensitive substring in a string       Sample code     string    This is a string    substring   i    firstIndex   stripos  string   substring    lastIndex   strripos  string   substring    echo  Fist index        firstIndex          Last index       lastIndex       Output  Fist index   2 Last index   13

User · Answer

lt  php    sample array  fruits3          iron       1       ascorbic        potassium        ascorbic       2       2        1          Let s say we are looking for the item  ascorbic   in the above array    a PHP function matching indexOf   from JS echo array search  ascorbic    fruits3  true      returns  2      a PHP function matching lastIndexOf   from JS world function lastIndexOf  needle   arr        return array search  needle  array reverse  arr  true   true      echo lastIndexOf  ascorbic    fruits3      returns  4      so these  above  are the two ways to run a function similar to indexOf and lastIndexOf

User · Answer

You need the following functions to do this in PHP   strpos Find the position of the first occurrence of a substring in a string strrpos Find the position of the last occurrence of a substring in a string substr Return part of a string  Here s the signature of the substr function  string substr   string  string   int  start    int  length      The signature of the substring function  Java  looks a bit different  string substring  int beginIndex  int endIndex    substring  Java  expects the end-index as the last parameter  but substr  PHP  expects a length  It s not hard  to get the desired length by the end-index in PHP   sub   substr  str   start   end -  start    Here is the working code  start   strpos  message   -     1  if   req type      RMT          pt password   substr  message   start     else        end   strrpos  message   -         pt password   substr  message   start   end -  start

User · Answer

This is the best way to do it  very simple    msg    Hello this is a string    first index of i   stripos  msg  i     last index of i   strripos  msg   i     echo  First i        first index of i   PHP EOL   Last i        last index of i

[php] indexOf and lastIndexOf in PHP?

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