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(PHP 4, PHP 5)
strrpos — Findet das letzte Vorkommen eines Zeichens innerhalb einer Zeichenkette
Gibt die numerische Position des letzten Vorkommens von needle innerhalb der Zeichenkette haystack zurück. Beachten Sie, dass needle unter PHP 4 in diesem Fall nur ein einzelnes Zeichen sein kann. Wenn Sie eine Zeichenkette als needle übergeben, wird nur deren erstes Zeichen verwendet.
Wurde needle nicht gefunden, wird FALSE zurückgegeben.
Es liegt nahe, einen Fehler bei der Auswertung der Rückgabewerte von "Zeichen an Position 0 gefunden" und "Zeichen nicht gefunden" zu begehen. Am einfachsten finden Sie den Unterschied wie folgt heraus:
<?php
// in PHP 4.0.0 und neuer:
$pos = strrpos($meinstring, "b");
if ($pos === false) { // Beachten sie die drei Gleichheitszeichen
// nicht gefunden ...
}
// in Versionen aelter als 4.0.0:
$pos = strrpos($meinstring, "b");
if (is_bool($pos) && !$pos) {
// nicht gefunden ...
}
?>
Ist needle kein String, wird der Parameter in einen Integerwert konvertiert, der dem Ordinalwert des Zeichens entspricht.
Hinweis: Seit PHP 5.0.0 kann offset den Anfangspunkt der Suche ab einer beliebigen Anzahl Zeichen innerhalb des Strings angeben. Negative Werte beenden die Suche an einem beliebigen Punkt vor dem Ende der Zeichenkette.
Hinweis: Der Parameter needle kann seit PHP 5.0.0 auch ein String aus mehr als einem Zeichen sein.
Der optionale Parameter offset ermöglicht es Ihnen, die Startposition für die Suche innerhalb von haystack anzugeben. Die zurück gegebene Positions-Angabe ist dann relativ zum Anfang von haystack.
An usage of strrpos() is to find the last space of a string. With this, we can cut an string without cutting any word.
<?php
function short_str( $str, $len, $cut = true ) {
if ( strlen( $str ) <= $len ) return $str;
return ( $cut ? substr( $str, 0, $len ) : substr( $str, 0, strrpos( substr( $str, 0, $len ), ' ' ) ) ) . '...';
}
?>
Using the function:
<?php
# This is a test st...
echo short_str( 'This is a test string.', 17 );
# This is a test...
echo short_str( 'This is a test string.', 17, false );
?>
If you're trying to do what "Alexandre" did a few posts below this one, that is, removing trailing slashes, just use rtrim() for simple stuff, and a preg function for more complicated removals.
Either one of the following functions will remove a trailing slash unless it's a root folder.
<?php
function trimTrailingSlashes1( $str ) {
// It's always a good idea to do this just to make sure.
$str = trim($str);
// If it's root, don't rtrim() the only slash away.
// Passing a character mask to rtrim makes it look for the
// characters you specify.
return $str == '/' ? $str : rtrim($str, '/');
}
?>
I've got a simple method of performing a reverse strpos which may be of use. This version I have treats the offset very simply:
Positive offsets search backwards from the supplied string index.
Negative offsets search backwards from the position of the character that many characters from the end of the string.
Here is an example of backwards stepping through instances of a string with this function:
<?php
function backwardStrpos($haystack, $needle, $offset = 0){
$length = strlen($haystack);
$offset = ($offset > 0)?($length - $offset):abs($offset);
$pos = strpos(strrev($haystack), strrev($needle), $offset);
return ($pos === false)?false:( $length - $pos - strlen($needle) );
}
$pos = 0;
$count = 0;
echo "Test1<br/>";
while(($pos = backwardStrpos("012340567890", "0", $pos)) !== false){
echo $pos."<br/>";
$pos--;
if($pos < 0){
echo "Done<br/>";break;
}
}
echo "---===---<br/>\nTest2<br/>";
echo backwardStrpos("12341234", "1", 2)."<br/>";
echo backwardStrpos("12341234", "1", -2);
?>
Outputs:
Test1
11
5
0
Done
---===---
Test2
0
4
With Test2 the first line checks from the first 3 in "12341234" and runs backwards until it finds a 1 (at position 0)
The second line checks from the second 2 in "12341234" and seeks towards the beginning for the first 1 it finds (at position 4).
This function is useful for php4 and also useful if the offset parameter in the existing strrpos is equally confusing to you as it is for me.
I needed to check if a variable that contains a generated folder name based on user input had a trailing slash.
This did the trick:
<?php
// Detect and remove a trailing slash
$root_folder = ((strrpos($root_folder, '/') + 1) == strlen($root_folder)) ? substr($root_folder, 0, - 1) : $root_folder;
?>
I had a problem where I was using the following in my .htaccess file.
php_value auto_prepend_file "pre.php"
php_value auto_append_file "post.php"
Not knowing how to prevent the htaccess directives from cascading, without having to put an override .htaccess in each subfolder, I figured, just prevent output in my pre and post scripts if we weren't in the root folder!
I did it using this line of code:
if (strrpos($_SERVER["REQUEST_URI"], "/") != 0) return;
Prevents execution of the rest of the script, and most importantly, doesn't output anything before any other headers may be sent by things in other folders (like my wiki site).
not all code is the same.
it should be coded such as
<?php
$a = "abcd";
if(is_bool(strrpos($a,"a")))
echo "Bad";
else
echo "Good";
Gives:
Good
This is how you might expect it to work, but it will fail;
<?
$a = "abcd";
if(!strrpos($a,"a"))
echo "Bad";
else
echo "Good";
Gives:
Bad
<php
$pos = strlen(string $haystack) - strpos (strrev(string $haystack), strrev(string $needle)) - strlen(string $needle);
?>
If in the needle there is more than one character then in php 4 we can use the above statement for finding the position of last occurrence of a substring in a string instead of strrpos. Because in php 4 strrpos uses the first character of the substring.
eg :
<php
$haystack = "you you you you you";
$needle = "you";
$pos1 = strlen($haystack) - strpos (strrev($haystack), strrev($needle)) - strlen($needle);
echo $pos1 . "<br>";
$pos2 strrpos($haystack, $needle);
echo $pos2 . "<br>";
?>
the function posted is false, hier the correction:
function rstrpos ($haystack, $needle, $offset)
{
$size = strlen ($haystack);
$pos = strpos (strrev($haystack), strrev($needle), $size - $offset);
if ($pos === false)
return false;
return $size - $pos - strlen($needle);
}
Here is a simple function to find the position of the next occurrence of needle in haystack, but searching backwards (lastIndexOf type function):
//search backwards for needle in haystack, and return its position
function rstrpos ($haystack, $needle, $offset){
$size = strlen ($haystack);
$pos = strpos (strrev($haystack), $needle, $size - $offset);
if ($pos === false)
return false;
return $size - $pos;
}
Note: supports full strings as needle
what the hell are you all doing. Wanna find the *next* last from a specific position because strrpos is useless with the "offset" option, then....
ex: find 'Z' in $str from position $p, backward...
while($p > -1 and $str{$p} <> 'Z') $p--;
Anyone will notice $p = -1 means: *not found* and that you must ensure a valid start offset in $p, that is >=0 and < string length. Doh
The documentation for 'offset' is misleading.
It says, "offset may be specified to begin searching an arbitrary number of characters into the string. Negative values will stop searching at an arbitrary point prior to the end of the string."
This is confusing if you think of strrpos as starting at the end of the string and working backwards.
A better way to think of offset is:
- If offset is positive, then strrpos only operates on the part of the string from offset to the end. This will usually have the same results as not specifying an offset, unless the only occurences of needle are before offset (in which case specifying the offset won't find the needle).
- If offset is negative, then strrpos only operates on that many characters at the end of the string. If the needle is farther away from the end of the string, it won't be found.
If, for example, you want to find the last space in a string before the 50th character, you'll need to do something like this:
strrpos($text, " ", -(strlen($text) - 50));
If instead you used strrpos($text, " ", 50), then you would find the last space between the 50th character and the end of the string, which may not have been what you were intending.
It would probably be good if someone would care to merge these little thoughts together...
<?php
function super_conforming_strrpos($haystack, $needle, $offset = 0)
{
# Why does strpos() do this? Anyway...
if(!is_string($needle)) $needle = ord(intval($needle));
if(!is_string($haystack)) $haystack = strval($haystack);
# Setup
$offset = intval($offset);
$hlen = strlen($haystack);
$nlen = strlen($needle);
# Intermezzo
if($nlen == 0)
{
trigger_error(__FUNCTION__.'(): Empty delimiter.', E_USER_WARNING);
return false;
}
if($offset < 0)
{
$haystack = substr($haystack, -$offset);
$offset = 0;
}
elseif($offset >= $hlen)
{
trigger_error(__FUNCTION__.'(): Offset not contained in string.', E_USER_WARNING);
return false;
}
# More setup
$hrev = strrev($haystack);
$nrev = strrev($needle);
# Search
$pos = strpos($hrev, $nrev, $offset);
if($pos === false) return false;
else return $hlen - $nlen - $pos;
}
?>
Full strpos() functionality, by yours truly.
<?php
function conforming_strrpos($haystack, $needle, $offset = 0)
{
# Why does strpos() do this? Anyway...
if(!is_string($needle)) $needle = ord(intval($needle));
$haystack = strval($haystack);
# Parameters
$hlen = strlen($haystack);
$nlen = strlen($needle);
# Come on, this is a feature too
if($nlen == 0)
{
trigger_error(__FUNCTION__.'(): Empty delimiter.', E_USER_WARNING);
return false;
}
$offset = intval($offset);
$hrev = strrev($haystack);
$nrev = strrev($needle);
# Search
$pos = strpos($hrev, $nrev, $offset);
if($pos === false) return false;
else return $hlen - $nlen - $pos;
}
?>
Note that $offset is evaluated from the end of the string.
Also note that conforming_strrpos() performs some five times slower than strpos(). Just a thought.
To begin, i'm sorry for my English.
So, I needed of one function which gives me the front last position of a character.
Then I said myself that it should be better to make one which gives the "N" last position.
$return_context = "1173120681_0__0_0_Mijsoot_Thierry";
// Here i need to find = "Mijsoot_Thierry"
//echo $return_context."<br />";// -- DEBUG
function findPos($haystack,$needle,$position){
$pos = strrpos($haystack, $needle);
if($position>1){
$position --;
$haystack = substr($haystack, 0, $pos);
$pos = findPos($haystack,$needle,$position);
}else{
// echo $haystack."<br />"; // -- DEBUG
return $pos;
}
return $pos;
}
var_dump(findPos($return_context,"_",2)); // -- TEST
Function to truncate a string
Removing dot and comma
Adding ... only if a is character found
function TruncateString($phrase, $longueurMax = 150) {
$phrase = substr(trim($phrase), 0, $longueurMax);
$pos = strrpos($phrase, " ");
$phrase = substr($phrase, 0, $pos);
if ((substr($phrase,-1,1) == ",") or (substr($phrase,-1,1) == ".")) {
$phrase = substr($phrase,0,-1);
}
if ($pos === false) {
$phrase = $phrase;
}
else {
$phrase = $phrase . "...";
}
return $phrase;
}
Actually, there is a little problem on your code: if $needle is not found inside $haystack, the function should return FALSE, but it is actually returning strlen($haystack) - strlen($needle). Here is a corrected version of it:
<?php
function stringrpos($haystack,$needle,$offset=NULL)
{
if (strpos($haystack,$needle,$offset) === FALSE)
return FALSE;
return strlen($haystack)
- strpos( strrev($haystack) , strrev($needle) , $offset)
- strlen($needle);
}
?>
<?php
/*******
** Maybe the shortest code to find the last occurence of a string, even in php4
*******/
function stringrpos($haystack,$needle,$offset=NULL)
{
return strlen($haystack)
- strpos( strrev($haystack) , strrev($needle) , $offset)
- strlen($needle);
}
// @return -> chopped up for readability.
?>
I was having some issues when I moved my code to run it on a different server.
The earlier php version didn't support more than one character needles, so tada, bugs. It's in the docs, i'm just pointing it out in case you're scratching your head for a while.
Returns the filename's string extension, else if no extension found returns false.
Example: filename_extension('some_file.mp3'); // mp3
Faster than the pathinfo() analogue in two times.
<?php
function filename_extension($filename) {
$pos = strrpos($filename, '.');
if($pos===false) {
return false;
} else {
return substr($filename, $pos+1);
}
}
?>
<?php
###################################################
#
# DESCRIPTION:
# This function returns the last occurance of a string,
# rather than the last occurance of a single character like
# strrpos does. It also supports an offset from where to
# start the searching in the haystack string.
#
# ARGS:
# $haystack (required) -- the string to search upon
# $needle (required) -- the string you are looking for
# $offset (optional) -- the offset to start from
#
# RETURN VALS:
# returns integer on success
# returns false on failure to find the string at all
#
###################################################
function strrpos_string($haystack, $needle, $offset = 0)
{
if(trim($haystack) != "" && trim($needle) != "" && $offset <= strlen($haystack))
{
$last_pos = $offset;
$found = false;
while(($curr_pos = strpos($haystack, $needle, $last_pos)) !== false)
{
$found = true;
$last_pos = $curr_pos + 1;
}
if($found)
{
return $last_pos - 1;
}
else
{
return false;
}
}
else
{
return false;
}
}
?>
In strrstr function in php 4 there is also no offset.
<?
// by Shimon Doodkin
function chrrpos($haystack, $needle, $offset=false)
{
$needle=$needle[0];
$l=strlen($haystack);
if($l==0) return false;
if($offset===false) $offset=$l-1;
else
{
if($offset>$l) $offset=$l-1;
if($offset<0) return false;
}
for(;$offset>0;$offset--)
if($haystack[$offset]==$needle)
return $offset;
return false;
}
?>
Brian below is incorrect about strrpos on different platforms.
Tested on Home PC (win32 + PHP 5.1.2) and Web Server (linux + 4.4.1)
echo strrpos("blah.blahannila","blaha");
returns 5 on windows
returns 5 on linux
Could've been a bug with an earlier PHP version, however the latest version of PHP returns position of the beginning of the string we're trying to find.
-Thaddeus
As noted in some examples below, strrpos does not act the same on every platform!
On Linux, it returns the position of the end of the target
On Windows, it returns the position of the start of the target
strrpos ("c:/somecity/html/t.php")
returns 11 on Windows
returns 16 on Linux
Brian
The "find-last-occurrence-of-a-string" functions suggested here do not allow for a starting offset, so here's one, tried and tested, that does:
function my_strrpos($haystack, $needle, $offset=0) {
// same as strrpos, except $needle can be a string
$strrpos = false;
if (is_string($haystack) && is_string($needle) && is_numeric($offset)) {
$strlen = strlen($haystack);
$strpos = strpos(strrev(substr($haystack, $offset)), strrev($needle));
if (is_numeric($strpos)) {
$strrpos = $strlen - $strpos - strlen($needle);
}
}
return $strrpos;
}
Very handy to get a file extension:
$this->data['extension'] = substr($this->data['name'],strrpos($this->data['name'],'.')+1);
RE: hao2lian
There are a lot of alternative - and unfortunately buggy - implementations of strrpos() (or last_index_of as it was called) on this page. This one is a slight modifiaction of the one below, but it should world like a *real* strrpos(), because it returns false if there is no needle in the haystack.
<?php
function my_strrpos($haystack, $needle) {
$index = strpos(strrev($haystack), strrev($needle));
if($index === false) {
return false;
}
$index = strlen($haystack) - strlen($needle) - $index;
return $index;
}
?>
If you are a VBScript programmer ("ex-" of course), you will find that 'strrpos' doesn't work like the VBScript 'instrRev' function.
Here is the equivalent function:
VBScript:
k=instrrev(s,">",j);
PHP Equivalent of the above VBScript:
$k=strrpos(substr($s,0,$j),'>');
Comments:
You might think (I did!) that the following PHP function call would be the equivant of the above VBScript call:
$kk=strrpos($s,'>',$j);
NOPE! In the above PHP call, $j defines the position in the string that should be considered the BEGINNING of the string, whereas in the VBScript call, j is to be considered the END of the string, as far as this search is concerned. Anyway, the above 'strrpos' with the 'substr' will work.
(Probably faster to write a for loop!)
Yet another correction on the last_index_of function algorithm:
function last_index_of($haystack, $needle) {
$index = strpos(strrev($haystack), strrev($needle));
$index = strlen($haystack) - strlen($needle) - $index;
return $index;
}
"strlen(index)" in the most recent one should be "strlen($needle)".
I needed to remove last directory from an path, and came up with this solution:
<?php
$path_dir = "/my/sweet/home/";
$path_up = substr( $path_dir, 0, strrpos( $path_dir, '/', -2 ) )."/";
echo $path_up;
?>
Might be helpful for someone..
In the below example, it should be substr, not strrpos.
<PHP?
$filename = substr($url, strrpos($url, '/') + 1);
?>
I was immediatley pissed when i found the behaviour of strrpos ( shouldnt it be called charrpos ?) the way it is, so i made my own implement to search for strings.
<?
function proper_strrpos($haystack,$needle){
while($ret = strrpos($haystack,$needle))
{
if(strncmp(substr($haystack,$ret,strlen($needle)),
$needle,strlen($needle)) == 0 )
return $ret;
$haystack = substr($haystack,0,$ret -1 );
}
return $ret;
}
?>
If you wish to look for the last occurrence of a STRING in a string (instead of a single character) and don't have mb_strrpos working, try this:
function lastIndexOf($haystack, $needle) {
$index = strpos(strrev($haystack), strrev($needle));
$index = strlen($haystack) - strlen(index) - $index;
return $index;
}
Function like the 5.0 version of strrpos for 4.x.
This will return the *last* occurence of a string within a string.
function strepos($haystack, $needle, $offset=0) {
$pos_rule = ($offset<0)?strlen($haystack)+($offset-1):$offset;
$last_pos = false; $first_run = true;
do {
$pos=strpos($haystack, $needle, (intval($last_pos)+(($first_run)?0:strlen($needle))));
if ($pos!==false && (($offset<0 && $pos <= $pos_rule)||$offset >= 0)) {
$last_pos = $pos;
} else { break; }
$first_run = false;
} while ($pos !== false);
if ($offset>0 && $last_pos<$pos_rule) { $last_pos = false; }
return $last_pos;
}
If my math is off, please feel free to correct.
- A positive offset will be the minimum character index position of the first character allowed.
- A negative offset will be subtracted from the total length and the position directly before will be the maximum index of the first character being searched.
returns the character index ( 0+ ) of the last occurence of the needle.
* boolean FALSE will return no matches within the haystack, or outside boundries specified by the offset.
this is my function for finding a filename in a URL:
<?php
function getfname($url){
$pos = strrpos($url, "/");
if ($pos === false) {
// not found / no filename in url...
return false;
} else {
// Get the string length
$len = strlen($url);
if ($len < $pos){
print "$len / $pos";
// the last slash we found belongs to http:// or it is the trailing slash of a URL
return false;
} else {
$filename = substr($url, $pos+1, $len-$pos-1);
}
}
return $filename;
}
?>
What the heck, I thought I'd throw another function in the mix. It's not pretty but the following function counts backwards from your starting point and tells you the last occurrance of a mixed char string:
<?php
function strrposmixed ($haystack, $needle, $start=0) {
// init start as the end of the str if not set
if($start == 0) {
$start = strlen($haystack);
}
// searches backward from $start
$currentStrPos=$start;
$lastFoundPos=false;
while($currentStrPos != 0) {
if(!(strpos($haystack,$needle,$currentStrPos) === false)) {
$lastFoundPos=strpos($haystack,$needle,$currentStrPos);
break;
}
$currentStrPos--;
}
if($lastFoundPos === false) {
return false;
} else {
return $lastFoundPos;
}
}
?>
This function does what strrpos would if it handled multi-character strings:
<?php
function getLastStr($hay, $need){
$getLastStr = 0;
$pos = strpos($hay, $need);
if (is_int ($pos)){ //this is to decide whether it is "false" or "0"
while($pos) {
$getLastStr = $getLastStr + $pos + strlen($need);
$hay = substr ($hay , $pos + strlen($need));
$pos = strpos($hay, $need);
}
return $getLastStr - strlen($need);
} else {
return -1; //if $need wasn´t found it returns "-1" , because it could return "0" if it´s found on position "0".
}
}
?>
this could be, what derek mentioned:
<?
function cut_last_occurence($string,$cut_off) {
return strrev(substr(strstr(strrev($string), strrev($cut_off)),strlen($cut_off)));
}
// example: cut off the last occurence of "limit"
$str = "select delta_limit1, delta_limit2, delta_limit3 from table limit 1,7";
$search = " limit";
echo $str."\n";
echo cut_last_occurence($str,"limit");
?>
I should have looked here first, but instead I wrote my own version of strrpos that supports searching for entire strings, rather than individual characters. This is a recursive function. I have not tested to see if it is more or less efficient than the others on the page. I hope this helps someone!
<?php
//Find last occurance of needle in haystack
function str_rpos($haystack, $needle, $start = 0){
$tempPos = strpos($haystack, $needle, $start);
if($tempPos === false){
if($start == 0){
//Needle not in string at all
return false;
}else{
//No more occurances found
return $start - strlen($needle);
}
}else{
//Find the next occurance
return str_rpos($haystack, $needle, $tempPos + strlen($needle));
}
}
?>
derek@slashview.com notes a great replacement for strrpos because of the single character needle limitation in the strrpos function. He made a slight error in the code. He adds the length of the needle string instead of subtracting it from the final position. The function should be:
<?php
function strlastpos($haystack, $needle) {
# flip both strings around and search, then adjust position based on string lengths
return strlen($haystack) - strlen($needle) - strpos(strrev($haystack), strrev($needle));
}
?>
This function does what strrpos would if it handled multi-character strings:
<?php
//function recurses until it finds last instance of $needle in $haystack
function getLastStr($haystack, $needle, $first_time=1){
$test=strstr($haystack, $needle);//is the needle there?
if ($test) return getLastStr($test, $needle, 0);//see if there is another one?
else if ($first_time) return false;//there is no occurence at all
else return $haystack;//that was the last occurence
}
?>
refering to the comment and function about lastIndexOf()...
It seemed not to work for me the only reason I could find was the haystack was reversed and the string wasnt therefore it returnt the length of the haystack rather than the position of the last needle... i rewrote it as fallows:
<?php
function strlpos($f_haystack,$f_needle) {
$rev_str = strrev($f_needle);
$rev_hay = strrev($f_haystack);
$hay_len = strlen($f_haystack);
$ned_pos = strpos($rev_hay,$rev_str);
$result = $hay_len - $ned_pos - strlen($rev_str);
return $result;
}
?>
this one fallows the strpos syntax rather than java's lastIndexOf.
I'm not positive if it takes more resources assigning all of those variables in there but you can put it all in return if you want, i dont care if i crash my server ;).
~SILENT WIND OF DOOM WOOSH!
For those of you coming from VBScript, I have
converted the instrrev function to PHP:
<?php
function instrrev($n,$s) {
$x=strpos(chr(0).strrev($n),$s)+0;
return (($x==0) ? 0 : strlen($n)-$x+1);
}
?>
Remember that, unlike PHP and Javascript, VBScript
returns 0 for no string found and 1 for the first
character position, etc.
Hopefully this will save some time if you are
converting ASP pages to PHP.
I was looking for the equivalent of Java's lastIndexOf(). I couldn't find it so I wrote this:
<?php
/*
Method to return the last occurrence of a substring within a
string
*/
function last_index_of($sub_str,$instr) {
if(strstr($instr,$sub_str)!="") {
return(strlen($instr)-strpos(strrev($instr),$sub_str));
}
return(-1);
}
?>
It returns the numerical index of the substring you're searching for, or -1 if the substring doesn't exist within the string.
Maybe I'm the only one who's bothered by it, but it really bugs me when the last line in a paragraph is a single word. Here's an example to explain what I don't like:
The quick brown fox jumps over the lazy
dog.
So that's why I wrote this function. In any paragraph that contains more than 1 space (i.e., more than two words), it will replace the last space with ' '.
<?php
function no_orphans($TheParagraph) {
if (substr_count($TheParagraph," ") > 1) {
$lastspace = strrpos($TheParagraph," ");
$TheParagraph = substr_replace($TheParagraph," ",$lastspace,1);
}
return $TheParagraph;
}
?>
So, it would change "The quick brown fox jumps over the lazy dog." to "The quick brown fox jumps over the lazy dog." That way, the last two words will always stay together.
that function can be modified to this
<?php
function strrpos_str ($string, $searchFor, $startFrom = 0)
{
$addLen = strlen ($searchFor);
$endPos = $startFrom - $addLen;
while (true)
{
if (($newPos = strpos ($string, $searchFor, $endPos + $addLen)) === false) break;
$endPos = $newPos;
}
return ($endPos >= 0) ? $endPos : false;
}
// example
$str = "abcabcabc";
$search = "ab";
$pos = strrpos_str ($str, $search);
if ($pos === false) echo "not found";
else echo $pos; // returns 6 in this case
?>
Cause:
Find position of last occurrence of a string in a string...
and I needed it, I hacked a little code to do this:
Maybe it is helpful for you.
<?php
function _strrpos_needle($sourcestring,$needle){
/* just for easier understanding */
$tempString=$sourcestring;
do {
$tempPos=strpos($tempString,$needle);
$tempString=substr($tempString,$tempPos+strlen($needle));
$realPos=$realPos+$tempPos;
} while (!is_bool($tempPos));
return $realPos;
}
?>
To find the position of the start of the last occurence of a string, we can do this:
$pos=strlen($haystack) - (strpos(strrev($haystack), strrev($needle)) + strlen($needle));
The idea is to reverse both $needle and $haystack, use strpos to find the first occurence of $needle in $haystack, then count backwards by the length of $needle. Finally, subtract $pos from length of $haystack. A lot easier to figure out if you use a test string to visualize it. :)
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