strpos
i just recently did a function, that uses strrchr to format - let's say a currency - with 2 decimals. can also be done using number_format but you may NOT always want an automatic rounding of your decimals. thats there this function comes in handy:
<?php
function formatTwoDecimals($value, $trim)
{
$after_comma = substr(strrchr($value, $trim), 0, 3);
$in_front_of_comma = (int) $value;
$final = $in_front_of_comma . $after_comma;
return $final;
}
echo formatTwoDecimals("365.6078985", ".");
?>
this will produce
365.60
instead of
365.61
which will show up then you use number_format.
strrchr
(PHP 4, PHP 5)
strrchr — Find the last occurrence of a character in a string
Description
This function returns the portion of haystack which starts at the last occurrence of needle and goes until the end of haystack .
Parameters
- haystack
-
The string to search in
- needle
-
If needle contains more than one character, only the first is used. This behavior is different from that of strstr().
If needle is not a string, it is converted to an integer and applied as the ordinal value of a character.
Return Values
This function returns the portion of string, or FALSE if needle is not found.
ChangeLog
| Version | Description |
|---|---|
| 4.3.0 | This function is now binary safe. |
Examples
Example #1 strrchr() example
<?php
// get last directory in $PATH
$dir = substr(strrchr($PATH, ":"), 1);
// get everything after last newline
$text = "Line 1\nLine 2\nLine 3";
$last = substr(strrchr($text, 10), 1 );
?>
Notes
Note: This function is binary-safe.
add a note
User Contributed Notesstrrchr
subbz2k at yahoo dot de
01-Aug-2007 05:32
01-Aug-2007 05:32
repley at freemail dot it
11-Aug-2006 07:57
11-Aug-2006 07:57
Final get file name and extension into an array with or without dot, using strrchr and strrchr_reverse.
Note our use of !==. Now work if the position of $needle in $haystack was the 0th (first) character like ".htaccess"
<?
//strxchr(string haystack, string needle [, bool int leftinclusive [, bool int rightinclusive ]])
function strxchr($haystack, $needle, $l_inclusive = 0, $r_inclusive = 0){
//Note our use of !==. Now work if the position of $needle in $haystack was the 0th (first) character.
if(strrpos($haystack, $needle) !== false){
//Everything before last $needle in $haystack.
$left = substr($haystack, 0, strrpos($haystack, $needle) + $l_inclusive);
//Switch value of $r_inclusive from 0 to 1 and viceversa.
$r_inclusive = ($r_inclusive == 0) ? 1 : 0;
//Everything after last $needle in $haystack.
$right = substr(strrchr($haystack, $needle), $r_inclusive);
//Return $left and $right into an array.
$a = array($left, $right);
return $a;
}else{
return false;
}
}
?>
Repley
readless at gmx dot net
06-Jun-2006 08:55
06-Jun-2006 08:55
to: repley at freemail dot it
the code works very well, but as i was trying to cut script names (e.g.: $_SERVER["SCRIPT_NAME"] => /index.php, cut the string at "/" and return "index.php") it returned nothing (false). i've modified your code and now it works also if the needle is the first char.
- regards from germany
<?php
//strxchr(string haystack, string needle [, bool int leftinclusive [, bool int rightinclusive ]])
function strxchr($haystack, $needle, $l_inclusive = 0, $r_inclusive = 0){
if(strrpos($haystack, $needle)){
//Everything before last $needle in $haystack.
$left = substr($haystack, 0, strrpos($haystack, $needle) + $l_inclusive);
//Switch value of $r_inclusive from 0 to 1 and viceversa.
$r_inclusive = ($r_inclusive == 0) ? 1 : 0;
//Everything after last $needle in $haystack.
$right = substr(strrchr($haystack, $needle), $r_inclusive);
//Return $left and $right into an array.
return array($left, $right);
} else {
if(strrchr($haystack, $needle)) return array('', substr(strrchr($haystack, $needle), $r_inclusive));
else return false;
}
}
?>
repley at freemail dot it
18-May-2006 04:09
18-May-2006 04:09
Get file name and extension into an array with or without dot, using strrchr and strrchr_reverse.
<?
//strxchr(string haystack, string needle [, bool int leftinclusive [, bool int rightinclusive ]])
function strxchr($haystack, $needle, $l_inclusive = 0, $r_inclusive = 0){
if(strrpos($haystack, $needle)){
//Everything before last $needle in $haystack.
$left = substr($haystack, 0, strrpos($haystack, $needle) + $l_inclusive);
//Switch value of $r_inclusive from 0 to 1 and viceversa.
$r_inclusive = ($r_inclusive == 0) ? 1 : 0;
//Everything after last $needle in $haystack.
$right = substr(strrchr($haystack, $needle), $r_inclusive);
//Return $left and $right into an array.
$a = array($left, $right);
return $a;
}else{
return false;
}
}
//start test
$haystack = "unknown.txt.log.......gif.....jpeg";
$needle = ".";
$l_inclusive = 1; //1 for inclusive mode, 0 for NOT inclusive mode
$r_inclusive = 1; //1 for inclusive mode, 0 for NOT inclusive mode
$a = strxchr($haystack, $needle, $l_inclusive, $r_inclusive);
if($a){echo "Left: <strong>" . $a[0] . "</strong><br /> Right: <strong>" . $a[1] . "</strong>";}else{echo "Failed!";}
//end test
?>
Thanks to all.
Repley
sekati at gmail dot com
08-Apr-2006 06:43
08-Apr-2006 06:43
just a small addition to carlos dot lage at gmail dot com note which makes it a bit more useful and flexible:
<?php
// return everything up to last instance of needle
// use $trail to include needle chars including and past last needle
function reverse_strrchr($haystack, $needle, $trail) {
return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack, $needle) + $trail) : false;
}
// usage:
$ns = (reverse_strrchr($_SERVER["SCRIPT_URI"], "/", 0));
$ns2 = (reverse_strrchr($_SERVER["SCRIPT_URI"], "/", 1));
echo($ns . "<br>" . $ns2);
?>
freakinunreal at hotmail dot com
24-Dec-2005 11:54
24-Dec-2005 11:54
to marcokonopacki at hotmail dot com.
I had to make a slight change in your function for it to return the complete needle inclusive.
// Reverse search of strrchr.
function strrrchr($haystack,$needle)
{
// Returns everything before $needle (inclusive).
//return substr($haystack,0,strpos($haystack,$needle)+1);
// becomes
return substr($haystack,0,strpos($haystack,$needle)+strlen($needle));
}
Note: the +1 becomes +strlen($needle)
Otherwise it only returns the first character in needle backwards.
arcesis - gmail - com
11-Nov-2005 07:26
11-Nov-2005 07:26
A quick way to get file's extension (if it has one, otherwise you get an empty string), which can be used when you want to rename the file but keep the old extension. Or for similar purposes. Temporary variable is used just because it's slightly faster to store the value than to run the strrchr() function again.
<?php
$ext = substr(($t=strrchr("file.ext",'.'))!==false?$t:'',1);
?>
Primo Anderson Do Sítio
29-Jul-2005 11:24
29-Jul-2005 11:24
$filename = 'strrchr_test.php';
print strrchr( $filename, '.' );
Result:
.php
$other_filename = 'strrchr_test.asp.php';
print strrchr( $other_filename, '.' );
Result:
.php
carlos dot lage at gmail dot com
03-Apr-2005 12:45
03-Apr-2005 12:45
I used dchris1 at bigpond dot net dot au 's reverse strrchr and reduced it to one line of code and fixed it's functionality - the real strrchr() returns FALSE if the needle is not found, not the haystack :)
<?php
// reverse strrchr()
function reverse_strrchr($haystack, $needle)
{
return strrpos($haystack, $needle) ? substr($haystack, 0, strrpos($haystack, $needle) +1 ) : false;
}
?>
dchris1 at bigpond dot net dot au
16-Feb-2004 08:16
16-Feb-2004 08:16
The function provided by marcokonopacki at hotmail dot com isn't really a reverse-version of strrchr(), rather a reverse version of strchr(). It returns everything from the start of $haystack up to the FIRST instance of the $needle. This is basically a reverse of the behavior which you expect from strchr(). A reverse version of strrchr() would return everything in $haystack up to the LAST instance of $needle, eg:
<?php
// reverse strrchr() - PHP v4.0b3 and above
function reverse_strrchr($haystack, $needle)
{
$pos = strrpos($haystack, $needle);
if($pos === false) {
return $haystack;
}
return substr($haystack, 0, $pos + 1);
}
?>
Note that this function will need to be modified slightly to work with pre 4.0b3 versions of PHP due to the return type of strrpos() ('0' is not necessarily 'false'). Check the documentation on strrpos() for more info.
A function like this can be useful for extracting the path to a script, for example:
<?
$string = "/path/to/the/file/filename.php";
echo reverse_strrchr($string, '/'); // will echo "/path/to/the/file/"
?>
andfarm at thibs dot menloschool dot org
23-May-2003 05:24
23-May-2003 05:24
strrchr is also very useful for finding the extension of a file. For example:
$ext = strrchr($filename, ".");
and $ext will contain the extension of the file, including a ".", if the file has an extension, and FALSE if the file has no extension. If the file has multiple extensions, such as "evilfile.jpg.vbs", then this construction will just return the last extension.
marcokonopacki at hotmail dot com
14-Apr-2003 01:43
14-Apr-2003 01:43
<?
// Reverse search of strrchr.
function strrrchr($haystack,$needle)
{
// Returns everything before $needle (inclusive).
return substr($haystack,0,strpos($haystack,$needle)+1);
}
$string = "FIELD NUMBER(9) NOT NULL";
echo strrrchr($string,")"); // Will print FIELD (9)
?>
juancri at tagnet dot org
16-Nov-2002 04:02
16-Nov-2002 04:02
this functions returns the name of the current directory.
<?php
function currentd() {
return substr(strrchr(`pwd`, '/'), 1);
}
?>